What to avoid when taking low dose naltrexone

Someone starts low dose naltrexone on a Monday. By Tuesday night, they're in the emergency room. Not because LDN is inherently dangerous - it isn't, for most people - but because they took a cough syrup with codeine that had been sitting in their medicine cabinet for months.

This happens more than you'd think.

LDN works by temporarily blocking opioid receptors in your body and brain. That's the entire mechanism. But when anything with opioid activity is present in your system at the same time, the interaction can be severe and sudden. Understanding what to avoid when taking low dose naltrexone isn't just useful background knowledge. It can literally keep you out of the ER.

This guide covers everything: the medications you cannot combine with LDN, the supplements that quietly undermine how it works, the timing mistakes that reduce effectiveness, and who genuinely shouldn't be on it at all. Before you add LDN to your longevity stack, run your current supplements through the WinAging supplement interaction checker to catch anything that might conflict.

What is LDN and why it matters

Naltrexone was FDA-approved in 1984 at doses of 50 to 100 mg per day to treat opioid and alcohol use disorder. Low dose naltrexone uses doses roughly one-tenth of that: typically 1.5 to 4.5 mg per day. At these small amounts, it operates through a completely different mechanism.

Here's how it works. The brief receptor blockade from LDN lasts about 4 to 6 hours, then clears. During the following 18 to 20 hours, your body compensates by producing more endogenous opioids - beta-endorphins and enkephalins - and upregulating opioid receptor density. This rebound effect is part of what makes LDN therapeutically interesting.

But there's a second, increasingly important mechanism. LDN acts as an antagonist at Toll-like receptor 4 (TLR4), found on microglial cells in the brain and macrophages throughout the body. TLR4 activation drives chronic inflammatory cascades, including NF-kB signaling and pro-inflammatory cytokine production. By blocking TLR4, LDN suppresses the kind of low-grade chronic inflammation - sometimes called inflammaging - that accelerates biological aging and drives most age-related diseases.

The conditions LDN has the most clinical evidence for include fibromyalgia, Crohn's disease, multiple sclerosis, rheumatoid arthritis, Hashimoto's thyroiditis, ME/CFS, and long COVID. A landmark randomized, double-blind, placebo-controlled trial by Dr. Jarred Younger at the University of Alabama found greater than 30% pain reduction in fibromyalgia patients compared to placebo. A 2024 pilot study found LDN combined with NAD+ significantly improved fatigue scores in long COVID patients at 12 weeks. The evidence base is growing fast.

LDN is not commercially available at the 1.5 to 4.5 mg dose range. You need a prescription and a compounding pharmacy to fill it. This also means you need to be informed, because your pharmacist and prescriber may not flag every interaction.

WinAging covers the compounds and protocols that serious longevity optimizers actually use. LDN belongs in that conversation. But it deserves careful integration into your stack, not casual addition.

The #1 thing to avoid: opioids in any form

This section is the most important part of this guide. Read it carefully, even if you skip everything else.

LDN works by blocking opioid receptors. If opioids are present in your body when it does that, you'll experience something called precipitated withdrawal. This is withdrawal that happens suddenly and forcefully, triggered by naltrexone displacing opioids from their receptors all at once, rather than the gradual process of natural withdrawal.

Precipitated withdrawal is deeply unpleasant. Symptoms include intense nausea and vomiting, profuse sweating, severe muscle aches and bone pain, abdominal cramping, extreme anxiety and agitation, rapid heart rate, and a profound sense of dysphoria and dread. Onset can occur within minutes to a few hours of taking naltrexone. It can last for hours. It is not subtle. For people who don't know it's coming, it's terrifying.

Prescription opioid painkillers

Any prescription opioid is completely incompatible with LDN. There are no exceptions.

This includes oxycodone (OxyContin, Percocet), hydrocodone (Vicodin, Norco), morphine, fentanyl, codeine, tramadol, methadone, hydromorphone (Dilaudid), and buprenorphine (Suboxone, Subutex). If you're on any of these medications, you cannot start LDN until you've been completely opioid-free for an adequate washout period.

For short-acting opioids like oxycodone or hydrocodone, that washout is at least 7 to 10 days. For long-acting opioids and methadone, it's at least 10 to 14 days. Your prescribing physician should confirm clearance before you begin.

Over-the-counter products that contain opioids

This is where people get caught off guard. Many common OTC products contain opioids, often without obvious labeling.

Anti-diarrheal medications are the big one. Loperamide (Imodium) is technically an opioid. It doesn't cross the blood-brain barrier well at normal doses, so it doesn't produce euphoria, but it binds opioid receptors in the gut. Diphenoxylate (found in Lomotil) is another. While on LDN, reach for simethicone-based products or bismuth subsalicylate (Pepto-Bismol) for digestive issues instead.

Cough medicines are the other major source of hidden opioids. Many cough syrups contain codeine or hydrocodone. Check every label. While on LDN, use plain guaifenesin (like plain Mucinex) for congestion. Avoid any product with "codeine," "hydrocodone," or "DM" in the ingredients. We'll cover dextromethorphan (the DM in cough medicines) in the medication section below - it creates a different but still significant problem.

Kratom

Kratom (Mitragyna speciosa) contains alkaloids including mitragynine and 7-hydroxymitragynine that act on opioid receptors. It must be treated exactly like a prescription opioid when it comes to LDN. If you've been using kratom regularly, stop at least 7 days before starting LDN and confirm clearance with your prescriber. Don't assume kratom is different because it's herbal.

The surgery protocol

If you're scheduled for surgery and there's any chance you'll need opioid anesthesia or post-operative opioid pain management - and in most surgical procedures there is - you must stop LDN at least 72 hours before the procedure. Five to seven days is safer.

More importantly, tell your anesthesiologist and the entire surgical team that you take naltrexone. Medication reconciliation failures with naltrexone have caused patient harm. Your anesthesiologist needs to know because opioid dosing during surgery will be affected. Achieving adequate pain control may require higher-than-standard doses when naltrexone is on board.

After surgery, wait until you've been completely opioid-free for at least 5 days before restarting LDN. Mark these dates. Don't leave it to memory.

This applies to dental procedures too, if they involve opioid pain management. Always disclose naltrexone use to any prescribing provider.

Before starting LDN alongside anything else in your stack, use the supplement interaction checker and consult your prescribing physician about your full medication and supplement list.

Medications to use carefully or avoid

Beyond opioids, several other drug classes interact with LDN in ways that range from reducing effectiveness to genuinely incompatible.

Immunosuppressants for organ transplants

If you've had an organ transplant and you're on immunosuppressive therapy - tacrolimus, cyclosporine, mycophenolate mofetil, or sirolimus - LDN is contraindicated. LDN's immune-modulating mechanism can work against immunosuppressive drugs, potentially increasing the risk of organ rejection.

This is different from using immunosuppressants for autoimmune conditions. People with Crohn's disease, rheumatoid arthritis, or other autoimmune conditions who take immunosuppressants often successfully combine them with LDN. But the distinction matters. Organ transplant recipients should not take LDN without specialist evaluation. The consequences of undermining immunosuppression are catastrophic.

Benzodiazepines

Benzodiazepines - diazepam (Valium), alprazolam (Xanax), clonazepam (Klonopin), lorazepam (Ativan) - increase central nervous system depression risk when combined with naltrexone. They can also interfere with LDN's therapeutic effectiveness. Some prescribers manage this combination with close monitoring rather than prohibiting it outright, but this requires individual medical evaluation.

If you're on benzodiazepines and considering LDN, discuss it explicitly with both your existing prescribing physician and the LDN prescriber. Don't combine them without that conversation.

Dextromethorphan (DM in cough medicines)

Dextromethorphan - listed as "DM" on cough and cold product labels - interacts with LDN and can negate its therapeutic benefits. This isn't the same interaction as opioids. It won't cause precipitated withdrawal. The concern is effectiveness: DM can block LDN from working properly.

Dextromethorphan is in dozens of common OTC products: Robitussin DM, NyQuil, DayQuil, Mucinex DM, Theraflu, and many store-brand cold medicines. Check every label. If it says "DM" or lists dextromethorphan as an ingredient, don't take it while on LDN. Stick to plain guaifenesin for mucus relief and non-DM antihistamines for cold symptoms.

Thyroid medications: monitor, don't avoid

This one works differently. You don't need to avoid thyroid medications with LDN. But you do need to monitor thyroid levels more carefully than usual.

LDN is commonly used for Hashimoto's thyroiditis, an autoimmune condition that destroys thyroid tissue. By reducing the autoimmune attack, LDN can actually improve thyroid function over time. As the autoimmune destruction slows, your remaining thyroid tissue produces more hormone. This means your thyroid hormone replacement dose may need to be adjusted downward.

If you're on levothyroxine or natural desiccated thyroid and you start LDN, check thyroid function every 30 to 90 days for the first year. Work with your prescribing physician to track this carefully. Pair this with the WinAging biological age calculator to track your overall health trajectory alongside thyroid panels.

Warfarin and anticoagulants

If you're on warfarin or other anticoagulants, you'll need more frequent INR monitoring when you start LDN. Naltrexone is metabolized by the liver using some of the same cytochrome P450 enzyme pathways that process warfarin. The potential for drug level changes makes close monitoring prudent.

Antidepressants and psychiatric medications

Many people on SSRIs or tricyclic antidepressants successfully take LDN. Dr. Leonard Weinstock, a gastroenterologist with extensive LDN prescribing experience, reports combining LDN with SSRIs routinely without significant problems. The main watch-out is that LDN can cause a "jittery" or anxious feeling in some people during the initial weeks. This effect can be more pronounced in people already on psychiatric medications.

If you're on a complex psychiatric medication regimen, get explicit sign-off from your prescribing psychiatrist before starting LDN. Start at the lowest dose (1.5 mg or lower) and increase very slowly.

For any combination of LDN with other supplements or medications, the supplement interaction checker at WinAging is the fastest way to identify potential conflicts before you talk to your prescriber.

Supplement interactions you need to know

Most supplements are safe with LDN. But a few interactions are significant enough that ignoring them either eliminates LDN's effectiveness or creates real risk.

Calcium carbonate: the unexpected interaction

This one surprises people because calcium carbonate is about as mundane as supplements get. But it physically binds to naltrexone in the gastrointestinal tract, converting it into a slow-release form.

That sounds neutral. It isn't.

LDN's mechanism depends on being an immediate-release compound. The drug needs to create a brief, sharp blockade of opioid receptors, lasting roughly 4 to 6 hours, followed by a long rebound period. A slow-release formulation eliminates the sharp blockade. Without that, the entire mechanism breaks down. The drug becomes therapeutically inactive.

Two actions to take right now:

First, confirm with your compounding pharmacy that they're using a safe filler in your LDN capsules. The correct fillers are microcrystalline cellulose or avocado oil. Not calcium carbonate. Many compounding pharmacies use calcium carbonate without disclosing it. Ask specifically. If they say they use calcium carbonate, request a reformulation or find a different pharmacy.

Second, avoid calcium carbonate supplements within 2 to 3 hours of your LDN dose. This includes TUMS, Caltrate, and many multivitamins and antacids. Calcium citrate and calcium malate don't have this binding issue and are safe. Check your supplement labels carefully.

This interaction is documented by the LDN Research Trust and compounding pharmacists, but it's rarely mentioned in mainstream drug interaction databases. It's exactly the kind of subtle but important issue the supplement interaction checker helps you catch.

St. John's Wort

St. John's Wort is a potent inducer of the CYP3A4 liver enzyme and P-glycoprotein, both of which are involved in naltrexone metabolism. Taking them together can significantly alter how much LDN makes it into your bloodstream and how quickly it clears. This creates unpredictable drug levels and undermines the precise timing that LDN depends on. Avoid St. John's Wort while on LDN.

Ginkgo biloba and Echinacea

Both interact with the same metabolic enzyme pathways that process naltrexone. The clinical significance at LDN doses isn't precisely quantified, but the LDN Research Trust flags them as interactions to discuss with your prescriber. The potential for altered drug levels makes caution reasonable. If you're using either regularly, mention it to your LDN prescriber.

Immune-stimulating supplements: a theoretical caution

LDN works in part by modulating (not suppressing) immune function. Large doses of aggressively immune-stimulating supplements - very high-dose beta-glucans, thymosin peptides, certain medicinal mushroom concentrates - may interact with LDN's immunomodulatory effects in unpredictable ways. The evidence here is theoretical rather than clinical, but it's worth discussing with your prescriber if you're on a heavy immune-support protocol.

Supplements that are safe with LDN

Here's the reassuring part. Most longevity supplements pair well with LDN.

NAD+ precursors, including NMN and NR, are not just safe but potentially synergistic. A 2024 pilot study used LDN plus NAD+ together for long COVID fatigue and found significantly improved outcomes. Both target inflammation and cellular energy pathways, and they appear to work in complementary ways. For more on how berberine - one of the most-studied longevity compounds - fits alongside LDN, see the full guide. The short version: berberine's anti-inflammatory and blood sugar-regulating mechanisms are compatible with LDN's approach.

Other supplements reported as well-tolerated with LDN: magnesium, vitamin D3, omega-3 fatty acids, B vitamins, probiotics, quercetin, and N-acetylcysteine (NAC). These are foundation-level longevity compounds that most serious longevity stacks include. They work fine alongside LDN. For a deeper look at longevity protocols and how to combine these compounds intelligently, explore the WinAging blog.

Alcohol and food considerations

Alcohol

The relationship between LDN and alcohol is more nuanced than most interaction lists suggest.

At high-dose naltrexone (50 mg), the drug is FDA-approved to reduce alcohol cravings by blocking alcohol's rewarding effects. At LDN doses, this blocking is far less complete. Alcohol's impairment, including slowed reaction time, motor incoordination, and cognitive effects, still occurs normally. The intoxication-reduction effect is minimal at LDN doses. If anything, a false sense of sobriety could encourage more drinking, which defeats the purpose entirely.

The more significant concern is the liver. Both naltrexone and alcohol are metabolized hepatically, and combining them increases the burden on your liver. This isn't catastrophic for healthy people having an occasional drink. But it's worth taking seriously. The practical recommendation is to minimize alcohol intake while on LDN, and avoid it completely if you have any baseline liver concerns, elevated liver enzymes, or a history of liver disease.

When you start LDN, it's reasonable to get baseline liver enzymes checked (ALT and AST). Recheck at 6 months. If you notice dark urine, pale stools, or yellowing of the skin or eyes at any point, contact your doctor immediately and stop LDN until evaluated.

Track your overall health trajectory, including liver-related biomarkers, with the biological age calculator. It gives you a data-backed view of whether your protocol is moving your biology in the right direction.

Food

Good news on the dietary front: there are no specific food interactions with LDN that require attention. You can take it with or without food. Absorption isn't significantly affected by meal timing. The one exception is the calcium carbonate issue covered above, which applies to supplements taken near the time of your LDN dose, not to dietary calcium from dairy, leafy greens, or other food sources. Those calcium forms don't bind to naltrexone.

When to take LDN and timing mistakes to avoid

Getting the timing right matters more than most people realize. LDN isn't a "take it whenever" compound. The mechanism depends on precise timing.

Standard protocol: bedtime dosing

The standard recommendation is to take LDN approximately one hour before bedtime, somewhere between 9 PM and 11 PM. The rationale is elegant: the transient receptor blockade from LDN lasts about 4 to 6 hours. Your body's natural endorphin production peaks at night. By timing the blockade to coincide with peak endorphin production, then clearing before morning, you maximize the rebound effect during sleep and into the following day.

Most clinical trials use this protocol. It works for the majority of patients.

When to switch to morning dosing

The most common early side effect of LDN is vivid dreams. About 37% of patients experience this, often starting from the first dose. For some people it's interesting or even pleasant. For others, it disrupts sleep enough to be a real problem. Nightmares occur in a smaller subset.

The mechanism is the transient opioid receptor blockade occurring during REM sleep, which disrupts normal opioid regulation of dreaming. Once receptors adapt - which typically happens within 2 to 4 weeks - sleep normalizes.

If vivid dreams or insomnia are a problem, switch to morning dosing. The therapeutic effect is maintained for most conditions. Sleep disruption largely resolves. Some practitioners argue evening dosing is better for conditions involving nighttime pain or sleep dysfunction, but morning dosing is a well-supported alternative and worth trying before abandoning LDN entirely.

Track how sleep quality changes as you titrate. If you're using WinAging's tools to monitor your longevity metrics, include sleep quality as one of your tracked variables.

Missed doses

What if you forget a dose? Simple: skip it and resume your regular schedule the next day. Don't double up. Taking two doses doesn't help. It significantly increases the risk of side effects and makes the receptor blockade phase more intense than intended, which can cause significant discomfort for the next several hours.

Surgery: the protocol again

Stop LDN at minimum 72 hours before any surgical or dental procedure that may involve opioid anesthesia or opioid pain management. Five to seven days is safer if you can plan ahead. After surgery, wait until you've been opioid-free for at least 5 days before restarting. This is worth repeating because the consequences of getting it wrong during surgery are serious.

Who shouldn't take LDN

LDN is relatively well-tolerated. True intolerance requiring discontinuation occurs in fewer than 3% of patients. But there are situations where the risks are real.

Absolute contraindications

LDN is not appropriate for these situations without highly specialized medical management:

Current opioid use without a completed washout period. This includes prescription opioids, methadone, buprenorphine, and kratom. Organ transplant recipients on immunosuppressive therapy. Anyone with a confirmed allergy or hypersensitivity to naltrexone. People currently in acute opioid withdrawal (you must be through the acute phase before starting).

Relative contraindications: specialist management required

Severe liver disease or acute liver failure. At standard doses (50 mg), naltrexone carries an FDA black box warning for liver damage. At LDN doses the risk is substantially lower, but anyone with serious underlying liver disease should be monitored carefully. Baseline and periodic liver enzyme testing is appropriate.

Severe kidney disease affects naltrexone clearance. Altered clearance creates unpredictable drug levels, which complicates the timing-dependent mechanism of LDN.

Pregnancy is a complex category. LDN is FDA category C, meaning animal studies showed adverse fetal effects but adequate human controlled data doesn't exist. It's not absolutely prohibited, and some physicians use it during pregnancy for conditions like MS where the risk-benefit analysis may favor it. This requires a very careful, individualized conversation with your physician.

Breastfeeding is generally considered safer. Naltrexone is rated L1 (the safest category) by InfantRisk, with a relative infant dose of only 1.4%, well below the 10% threshold for concern. Still, discuss it with your doctor.

Certain psychiatric conditions where increased anxiety or activation could be harmful require careful risk-benefit evaluation. Start at the lowest possible dose and have a prescriber monitoring closely.

Side effects to expect when starting LDN

Knowing what to expect makes the difference between pushing through normal startup effects and worrying unnecessarily about something that will resolve on its own.

Vivid dreams and sleep changes

This is the most common early side effect, affecting around 37% of new users. It typically starts within the first few days and resolves within 2 to 4 weeks for most people. Vivid dreams are the mechanism working: the transient opioid blockade during sleep disrupts normal opioid regulation of REM dreaming.

For most people this isn't distressing. If it is, switch to morning dosing. The dreams usually stop.

Nausea

Mild nausea at initiation or with dose increases is common. It's usually transient, lasting a few days. Taking LDN with food can reduce this. If nausea persists beyond two weeks or is severe, reduce your dose and titrate more slowly.

Fatigue and headache

Both occur in some people during the first few weeks. Like nausea, these are typically front-loaded and resolve with time. If they persist, slow down the titration.

The "start low, go slow" protocol

The clinical approach that consistently produces the best outcomes: begin at 1.5 mg for 2 to 4 weeks. If tolerating well, increase to 3 mg for another 2 to 4 weeks. Then move to 4.5 mg, the dose used in most clinical trials.

For very sensitive individuals, particularly those with ME/CFS, Hashimoto's, or other autoimmune conditions, starting at 0.5 mg or lower and titrating over several months is well-supported. Slower titration means fewer side effects and better long-term tolerance. There's no rush.

If significant side effects occur at any step, drop back to the previous dose and hold there for an additional 2 to 4 weeks before trying to increase again. The goal is finding your stable dose, not hitting 4.5 mg as fast as possible.

When to contact a doctor

These symptoms warrant immediate medical attention: dark urine, pale stools, yellowing of skin or eyes (liver warning signs), severe abdominal pain in the right upper quadrant, confusion or significant cognitive changes, or suicidal thoughts. These are rare at LDN doses, but they're important to know.

Track your biomarkers and biological age trajectory with the WinAging biological age calculator as you start LDN. Having a quantitative baseline makes it easier to evaluate whether the compound is working and catch any adverse trends early. Use the supplement interaction checker any time you add a new compound to your stack.

Building a safe longevity stack with LDN

LDN has real potential as part of a comprehensive longevity protocol. Reducing chronic inflammation, modulating immune function, improving cellular energy pathways: these are meaningful mechanisms that align with how serious longevity optimizers think about aging. But integration matters.

Before you start LDN, audit your current supplement and medication regimen. The supplement interaction checker at WinAging makes this fast. Run every compound you're currently taking through it. Pay special attention to calcium carbonate (in supplements and antacid products), any cough or cold medicines in your cabinet, and any herbal products that might contain opioid-active compounds.

If you're taking berberine as part of your longevity stack - and many people interested in LDN are - the two are generally compatible. Berberine is an anti-inflammatory mTOR inhibitor with strong blood sugar and metabolic effects. LDN's TLR4-based anti-inflammatory mechanism targets different pathways, making them potentially complementary. Time berberine with meals (20-30 minutes before eating), LDN at bedtime, and they won't compete. The full guide to best berberine supplements covers how to choose a quality product and what to stack it with.

Compounds that are well-documented as safe alongside LDN: NMN, NR, resveratrol, NAC, quercetin, spermidine, vitamin D3, omega-3s, magnesium, and CoQ10. Most foundational longevity compounds you're likely already taking fall into the "safe" category.

Use the WinAging tools to build and optimize your stack systematically rather than adding compounds ad hoc. The biological age calculator gives you a quantitative baseline before you start any new protocol, including LDN, and ongoing tracking so you can see whether it's actually working. LDN takes 3 to 6 months to produce noticeable effects for most conditions. You want data, not guesswork.

Frequently asked questions

Can I take ibuprofen or aspirin with LDN?

Yes. NSAIDs like ibuprofen (Advil, Motrin), aspirin, and naproxen (Aleve) don't interact with LDN's opioid receptor mechanism. They're safe to combine. Worth noting: if LDN works as intended over the following months, you may find you need less NSAID relief as inflammation and pain reduce.

What about acetaminophen (Tylenol)?

Acetaminophen doesn't interact with opioid receptors and is safe to take alongside LDN. Both are metabolized by the liver, so regular heavy acetaminophen use while on LDN adds hepatic burden. Occasional standard doses are fine.

Can I take LDN and berberine together?

Yes, berberine is generally compatible with LDN. They target different inflammatory pathways and don't share any concerning interaction mechanisms. Time them appropriately: berberine with meals, LDN at bedtime. For the complete picture on berberine quality, dosing, and stacking, the supplement interaction checker can confirm your specific combination.

How long does it take for LDN to work?

Expect to wait 3 months before drawing conclusions. Some people notice improvements in sleep quality, energy, or pain within the first few weeks. Full therapeutic effects for autoimmune conditions, chronic pain, or fatigue typically take 3 to 6 months. Be patient with the titration process. Starting low and going slow leads to better long-term outcomes than rushing to 4.5 mg.

Can I drink alcohol while on LDN?

Occasional moderate alcohol isn't absolutely prohibited at LDN doses if your liver is healthy. But the combination increases hepatic burden, and the practical recommendation is to minimize alcohol intake. Avoid it entirely if you have any liver disease, elevated liver enzymes, or drink more than occasionally.

What if I need emergency pain medication?

Tell any emergency provider or surgeon that you take naltrexone, even at low doses. LDN creates opioid receptor blockade for roughly 4 to 6 hours after each dose. For emergencies, opioid pain management is still possible but may require higher-than-standard doses to be effective. Your medical team needs this information to manage your pain safely. For planned surgery, stop LDN at least 72 hours beforehand.

Is LDN safe for autoimmune diseases?

Autoimmune conditions are among the best-studied indications for LDN. Fibromyalgia, Crohn's disease, multiple sclerosis, rheumatoid arthritis, lupus, and Hashimoto's thyroiditis all have supporting clinical data. The anti-inflammatory mechanism through TLR4 blockade directly targets the chronic immune activation that drives autoimmune disease. Most people in these populations tolerate LDN well with the slow-titration approach. Use the biological age calculator and the WinAging tools to track your biomarkers as you start LDN, so you have objective data on how your body is responding.

Where can I get low dose naltrexone?

LDN requires a prescription and must be compounded since no commercial 1.5 to 4.5 mg formulation exists. Integrative and functional medicine physicians commonly prescribe it. Telemedicine platforms focused on LDN are the most accessible route in the US. The LDN Research Trust maintains prescriber and pharmacy directories at ldnresearchtrust.org. Cost is typically $30 to $60 per month out of pocket.

When you find a compounding pharmacy, specify immediate-release capsules with microcrystalline cellulose or avocado oil as the filler. Not calcium carbonate.

Want a personalized stack tailored to your goals? Try the AI protocol builder to get a custom longevity protocol in minutes.

Related guides

• Best berberine supplements: complete longevity guide
• Check your supplement stack for interactions
• Biological age calculator: track your longevity progress
• Free longevity tools
• WinAging longevity blog

Sources

• Low-Dose Naltrexone: Review of Therapeutic Utilization - PubMed Central
• LDN Research Trust: What is LDN and interactions guide
• LDN and NAD+ for post-COVID fatigue syndrome - PubMed Central

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Low dose naltrexone is one of the more underappreciated compounds in the longevity and autoimmune space. The research is solid and growing. The side effect profile is genuinely mild compared to most pharmaceuticals. And the mechanism - reducing chronic inflammatory signaling through TLR4 - addresses one of the core drivers of accelerated aging.

But it operates through opioid receptor blockade. That creates real risks when combined with the wrong things. Know what to avoid. Audit your current medications and supplements. Use the supplement interaction checker, talk to your prescriber, and take the time to do this right.

Explore the WinAging tools to build and track your complete longevity protocol.