Free tool

Supplement interaction checker

Select your supplements and instantly see which combinations are safe, which create synergies, and which you should avoid.

Can I take my supplements together?

It depends on the specific combination. Most longevity supplements are safe to combine, and many create beneficial synergies. But some pairs compete for absorption, overlap in mechanism (risking over-suppression), or should be timed apart. Select your supplements below to check every pairwise interaction instantly.

30+

Supplements covered

55+

Known interaction pairs

Interaction categories

1Supplement interaction checker 2How to use this tool 3Why supplement interactions matter 4Understanding the four interaction types 5The most important interactions to know 6Common stacking mistakes 7Optimal supplement timing guide 8Building a safe longevity stack 9Beginner, intermediate, and advanced stacks 10FAQ

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NAD+ precursors

Senolytics

mTOR modulators

AMPK activators

Mitochondrial support

Sirtuin activators

Amino acids

Foundational

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Select at least 2 supplements to check interactions

How to use this tool

Select your supplements

Browse by category or search by name. Click to add a supplement to your stack. You need at least 2 to check interactions. There's no limit, so add everything you're currently taking or considering.

Review interaction cards

Each pair gets a status: synergy (beneficial combo), safe (no issues), caution (watch out), or avoid (don't combine). Cards are automatically sorted with the most important warnings first so you see critical issues immediately.

Check timing advice

Each interaction card includes specific timing recommendations. Some supplements work better together, others should be separated by a few hours. Pay special attention to timing for mineral pairs and fat-soluble compounds.

Understand the mechanism

Every interaction includes a brief explanation of why two supplements interact the way they do. This helps you make informed decisions about your stack and understand the biology behind the recommendation.

Why supplement interactions matter

Most people build their supplement stack one product at a time. They hear about NMN on a podcast, add it. Read about berberine on Reddit, add it. See a longevity influencer talking about fisetin, throw that in too. Before long, they're taking 10+ supplements with zero thought about how they interact.

This matters because supplements don't exist in isolation inside your body. They share absorption pathways, compete for enzymes, and trigger overlapping signaling cascades. Some combinations amplify each other beautifully. Others cancel each other out. And a few can cause real problems.

The classic example: berberine and metformin. Both lower blood sugar through AMPK activation. Take them together and you're doubling down on the same mechanism, risking hypoglycemia. This isn't theoretical. It happens, and it can be dangerous.

On the flip side, some combos are genuinely better together. NMN and resveratrol is the textbook longevity stack. Resveratrol activates sirtuins, which consume NAD+. NMN replenishes NAD+. Together, you get more sirtuin activity than either alone. That's a synergy worth knowing about.

Then there are the subtle timing conflicts. High-dose zinc and magnesium compete for the same gut transporters. Take them at the same time and you absorb less of both. Separate them by two hours and the problem disappears. Simple fix, but only if you know about it.

Understanding the four interaction types

⚡

Synergy

Better together, complementary effects

✓

Safe

No known issues, take freely

⚠

Caution

Timing or dosage adjustments needed

Avoid

Don't combine, pick one

Synergy: the combinations that make each other stronger

When two supplements create a synergy, they're doing something together that neither does as well alone. This isn't just "both are good for you." It means the mechanisms complement each other in a specific, documented way. NMN + resveratrol is a synergy. CoQ10 + PQQ is a synergy. These are combinations worth seeking out.

Safe: take without worry

The majority of supplement pairs fall into this category. They don't help or hinder each other. Their mechanisms are independent, their absorption pathways don't compete, and there's no documented interaction in the literature. You can take them at the same time or separately. No special considerations needed.

Caution: adjustments needed

Caution doesn't mean "don't take these." It means there's something you should know before combining them. Maybe they should be separated by a few hours. Maybe one reduces the effectiveness of the other at high doses. Maybe they overlap enough that you should reduce the dose of one. Read the card carefully for specific guidance.

Avoid: pick one, not both

This is rare but important. When two supplements hit the exact same mechanism hard enough to cause problems, they get an "avoid" rating. Berberine + metformin is the clearest example. Both aggressively lower blood sugar. Together, they can push you into hypoglycemia. Choose one.

Prescription drug interactions

This tool covers supplement-to-supplement interactions only. If you're taking prescription medications (statins, blood thinners, immunosuppressants, diabetes medications, etc.), always check with your pharmacist or doctor before adding supplements. Some supplements, especially berberine, curcumin, and St. John's Wort, can significantly alter drug metabolism through CYP450 enzyme interactions.

The most important interactions to know

NMN + resveratrol: the gold standard synergy

This is the most discussed combination in longevity circles, and for good reason. Resveratrol activates SIRT1, the "longevity gene" enzyme. But SIRT1 needs NAD+ as fuel to function. NMN provides that fuel by boosting NAD+ levels. Without adequate NAD+, resveratrol's sirtuin activation falls flat. Together, they create a self-reinforcing cycle.

Take them together in the morning with a fat source (resveratrol is fat-soluble). David Sinclair, the Harvard longevity researcher, has publicly shared that he takes this combination daily.

Berberine + metformin: the dangerous overlap

Both activate AMPK. Both lower blood sugar. Both improve insulin sensitivity. Sounds great, right? The problem is they're too similar. Combining them is like taking a double dose of the same drug. Without medical supervision and blood glucose monitoring, this combination can cause dangerously low blood sugar, especially if you're not diabetic. Pick one.

Magnesium + vitamin D: the essential pair

This is one of the most important pairings most people don't know about. Vitamin D requires magnesium for activation. The enzymes that convert vitamin D to its active form (calcitriol) are magnesium-dependent. If you're supplementing vitamin D without adequate magnesium, you're not getting the full benefit. Always take them together.

Fisetin + quercetin: the senolytic duo

These two flavonoids are both senolytics, meaning they help clear senescent ("zombie") cells. Taken together, they target senescent cell survival networks through complementary pathways. Quercetin inhibits PI3K, while fisetin hits multiple survival pathways. The combination is more effective than either alone.

Important: senolytics are typically taken in pulses (2-3 consecutive days per month at higher doses), not daily. This cyclical approach clears senescent cells without affecting healthy ones.

CoQ10 + berberine: the protective pairing

Berberine, like statins, may inhibit the mevalonate pathway that produces CoQ10. This means long-term berberine use could theoretically reduce your CoQ10 levels. Supplementing CoQ10 alongside berberine covers this potential depletion. It's not a dangerous interaction, it's a smart precaution.

Common stacking mistakes

Stacking redundant NAD+ precursors

NMN, NR, and niacin all boost NAD+ through different pathways. But taking two or three of them doesn't triple your NAD+ levels. You hit diminishing returns fast, and you're wasting money. Pick one and stick with it. NMN is the most popular choice in the longevity community, though NR has strong research too.

Ignoring timing

Some supplements compete for absorption when taken at the same time. High-dose zinc and magnesium is a common example. They use similar transport mechanisms in the gut, so a mega-dose of both at once means you're absorbing less of each. Separate them by 2 hours and the problem vanishes.

Doubling up on blood sugar lowering

Berberine and metformin both activate AMPK and lower blood glucose. Adding both to your stack is like taking a double dose of the same mechanism. Unless you're under medical supervision with blood glucose monitoring, pick one. This is not a "more is better" situation.

Forgetting the foundations

People spend hundreds on exotic longevity compounds while being deficient in vitamin D, magnesium, and omega-3s. These foundational supplements impact hundreds of biological processes. Fix your basics first, then add specialty compounds. A $500/month longevity stack on top of a vitamin D deficiency is a waste of money.

Taking fat-soluble supplements on an empty stomach

Resveratrol, CoQ10, vitamin D, astaxanthin, and curcumin are all fat-soluble. They need dietary fat present to absorb properly. Taking them on an empty stomach dramatically reduces bioavailability. Always pair them with a meal containing fat, or take them with a fish oil capsule.

Smart stacking habits

Start with foundations (D3+K2, magnesium, omega-3)
Add one new supplement at a time
Wait 2-4 weeks before adding another
Take fat-soluble supplements with meals
Separate competing minerals by 2+ hours
Use this checker before changing your stack
Keep a simple log of what you take and when

Stacking mistakes

Don't take 3 NAD+ precursors at once
Don't combine berberine and metformin
Don't take everything on an empty stomach
Don't build a 10-supplement stack overnight
Don't ignore timing recommendations
Don't skip foundations for exotic compounds
Don't assume "more supplements = better health"

Optimal supplement timing guide

When you take your supplements matters almost as much as what you take. Here's a framework for organizing your daily stack.

Timing	Supplements	Why this timing
Morning with breakfast	NMN, resveratrol, vitamin D3+K2, CoQ10, B-complex, sulforaphane	Fat-soluble compounds absorb with breakfast fats. NMN and B vitamins provide daytime energy.
Midday with lunch	Omega-3, curcumin, astaxanthin, berberine	Second dose of fat-soluble compounds. Berberine works best with a carb-containing meal.
Evening with dinner	Magnesium, glycine, taurine, ashwagandha	Calming compounds that support relaxation and sleep quality. Magnesium supports GABA.
2+ hours from zinc	Magnesium (if also taking zinc)	High-dose zinc and magnesium compete for absorption. Separate them.
Cyclical (2-3 days/month)	Fisetin, quercetin, dasatinib	Senolytics work best in periodic high-dose pulses, not daily dosing.

Keep it simple

Don't overcomplicate timing. The perfect schedule you won't follow is worse than a simple one you will. Most people do well with "morning with breakfast" and "evening with dinner" as their two windows. That covers 90% of timing considerations.

Building a safe longevity stack

A good longevity stack hits multiple aging pathways without redundancy or dangerous overlaps. Think of it like a team: you want each member covering a different role, not five people doing the same job.

Here's the framework. Each category targets a different hallmark of aging:

NAD+ support: One precursor (NMN or NR) to maintain cellular energy production. NAD+ declines 50%+ by age 60.
Sirtuin activation: Resveratrol or spermidine to activate longevity genes. Works synergistically with NAD+ support.
Senolytic cleanup: Periodic fisetin or quercetin to clear senescent "zombie" cells that drive inflammation and aging.
Mitochondrial support: CoQ10 or urolithin A to keep cellular energy production running. Mitochondrial dysfunction is a hallmark of aging.
Anti-inflammatory base: Omega-3 and/or curcumin to control chronic low-grade inflammation (inflammaging).
AMPK/metabolic: Berberine or metformin to support metabolic health and blood sugar control. Pick one, not both.
Foundations: Vitamin D3 + K2, magnesium, and whatever basics you're deficient in. These underpin everything else.

You don't need all of these on day one. Start with foundations, add one category at a time, and use this checker to verify your combinations are compatible before each addition.

Beginner, intermediate, and advanced stacks

Beginner

Foundation stack ($20-40/month)

Vitamin D3 + K2 (5000 IU/day), Magnesium glycinate (400mg/day), Omega-3 fish oil (2g EPA+DHA/day), Creatine monohydrate (5g/day). These four cover the most common deficiencies and have the broadest evidence base. Start here and stay here for at least 2-3 months before adding anything else.

Intermediate

Add NAD+ and antioxidant support ($80-150/month)

Everything from beginner plus NMN (500mg-1g/day), Resveratrol (500mg/day with fat), and CoQ10 (200mg/day). This adds NAD+ support, sirtuin activation, and mitochondrial support. Take NMN + resveratrol together in the morning for synergy. CoQ10 with any fat-containing meal.

Advanced

Full longevity protocol ($150-300/month)

Everything from intermediate plus Berberine (500mg 2x/day with meals) or Metformin, periodic senolytics (Fisetin 2g for 2 days/month), Spermidine (1-2mg/day), and optional targeted compounds like Urolithin A or GlyNAC. Only add these after your foundations are solid and you're tracking biomarkers.

Cost-effectiveness matters

You don't need the advanced stack to get significant longevity benefits. The foundational supplements (D3+K2, magnesium, omega-3, creatine) provide the most bang for your buck. Each additional tier adds diminishing returns. An optimized beginner stack is better than a poorly-timed, redundant advanced stack. Quality of implementation matters more than quantity of supplements.

About our interaction data

Our interaction database covers the most commonly used longevity supplements and is based on published research, pharmacological data, and expert consensus. Pairs without specific data default to "safe" because they have no documented interactions. However, absence of evidence isn't evidence of absence. Individual responses can vary based on genetics, health conditions, and dosages. When in doubt, consult a healthcare provider familiar with supplement pharmacology.

Frequently asked questions

How many supplements can I check at once?

There's no limit. Select as many as you're taking and the tool will show every pairwise interaction. If you select 5 supplements, you'll see 10 interaction pairs. Select 10, and you'll see 45 pairs. The results are sorted so warnings appear first.

What does 'synergy' mean in the results?

Synergy means two supplements work better together than individually. They enhance each other's effects through complementary mechanisms. For example, NMN + resveratrol is a synergy because resveratrol activates sirtuins that need NAD+ fuel (which NMN provides). Synergies are combinations worth seeking out.

Should I avoid all 'caution' combinations?

Not necessarily. Caution means there's a potential concern worth knowing about, like timing conflicts, reduced absorption, or overlapping mechanisms. Often the fix is simple: separate the doses by a few hours, or reduce one dose. Read the timing advice on each card for the specific solution.

Does this tool check drug interactions?

No, this tool only checks supplement-to-supplement interactions. For drug interactions, consult your pharmacist or doctor. Some supplements (berberine, curcumin, St. John's Wort, grapefruit extract) can significantly affect drug metabolism through CYP450 enzyme interactions and should always be discussed with your prescriber.

Why does a pair show 'safe' when I've read about issues online?

Our database covers well-documented interactions from published research. Some concerns you see online may be theoretical, based on animal studies, specific to extreme doses, or anecdotal reports that haven't been replicated. If you have a specific concern, it's always worth discussing with a healthcare provider.

Can I take all my supplements at the same time?

For most combinations, yes. But some pairs benefit from timing separation. Fat-soluble supplements (vitamin D, CoQ10, resveratrol) absorb best with meals containing fat. Minerals like zinc and magnesium may compete at very high doses. Check the timing advice for your specific combinations.

How often is the interaction database updated?

We review and update the database regularly as new research is published. The longevity supplement space moves fast, and we stay current with major findings from peer-reviewed journals, expert guidance, and pharmacological databases.

Is this tool a replacement for medical advice?

No. This tool is educational. It helps you understand common supplement interactions, but it doesn't account for your specific health conditions, genetics, medications, or dosages. Always discuss your supplement stack with a qualified healthcare provider, especially if you're on prescription medications.

What supplements should beginners start with?

Start with foundations: vitamin D3 + K2 (5000 IU), magnesium glycinate (400mg), omega-3 fish oil (2g EPA+DHA), and optionally creatine (5g). Most people are deficient in these, and they impact hundreds of biological processes. Once your basics are covered and you've been consistent for 2-3 months, consider adding one longevity-specific supplement at a time.

Can I take NMN with berberine?

Use caution. Berberine activates AMPK, which may interfere with NAD+ synthesis pathways that NMN relies on. If you want both, separate them by 4-6 hours: berberine with meals, NMN in the morning or afternoon. Some longevity practitioners use this approach successfully.

What's the best NMN + resveratrol protocol?

Take 500mg-1g NMN with 500mg trans-resveratrol together in the morning with a meal containing fat. Resveratrol is fat-soluble and needs dietary fat for absorption. The fat also doesn't hurt NMN absorption. This is one of the best-documented synergies in the longevity supplement space.

Are there supplements that should never be combined?

Very few supplement pairs are truly dangerous, but berberine + metformin is the most important one to avoid due to the risk of hypoglycemia. High-dose rapamycin + other immunosuppressive compounds should only be used under medical supervision. Most other 'avoid' pairs are about redundancy rather than danger.

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