Best NMN Supplements 2026: 8 Products Compared and Ranked

Last updated: September 5, 2026 · Originally published August 2, 2026 · Published by Eternal Elixir

Last updated: September 4, 2026 · By Eternal Elixir Editorial · 8 products compared

In the largest published human dose-ranging trial of NMN to date, 80 healthy middle-aged adults took 300 mg, 600 mg, 900 mg or placebo daily for 60 days. Blood NAD rose significantly in every NMN group, and the clearest gains landed at 600 mg per day. That single number reframes the whole shopping problem: if roughly 500–600 mg a day is the meaningful target, then the only question that matters when you compare the best NMN supplements is what it costs you to hit that number, every day, for a year.

Almost no buying guide answers that question. They quote a price per serving — but one brand’s serving is 500 mg in one capsule, another’s is 500 mg in two capsules, and a third’s is 900 mg. Those numbers are not comparable, and stacking them in a table makes cheap products look expensive and expensive products look cheap. So we normalized every product below to the same unit: cost per 500 mg of NMN.

Key numbers:

• $0.56 — lowest cost per 500 mg of NMN in this comparison (Eternal Elixir NMN 500mg, $49.99 for 90 capsules)
• $2.17 — highest cost per 500 mg-NMN serving here, for a six-active complex rather than standalone NMN
• 600 mg/day — the dose at which clinical efficacy peaked in the 2023 GeroScience randomized trial
• 3.9× — the spread between the cheapest and most expensive way to buy 500 mg of NMN below
• 2 of 8 — products whose bottle does not clearly declare servings per container

How the Best NMN Supplements Compare on Cost Per 500 mg

The eight best NMN supplements below are ranked on the weighted criteria set out further down, not on price alone.

Every price was read from the seller’s own US storefront on August 2, 2026. Supplement pricing moves constantly, especially on multi-bottle promotions, so treat these as a snapshot and confirm before you buy. Where a figure comes from a third-party roundup rather than our own check, we say so in the row.

How to read the comparison table

The final column is the one to read. It answers a single question: what does one 500 mg dose of NMN cost from this product? Everything is expressed in the same unit, in USD.

Two rows in that table say “not calculable,” and that is deliberate. If a product does not declare servings per container on its listing — including one of our own — you cannot honestly compute its cost per dose, and we are not going to invent a number to fill a cell. That gap is itself useful information when you are choosing between the best NMN supplements on sale in the US right now.

1. ProHealth Longevity NMN Pro 500 — Best Overall

ProHealth Longevity NMN Pro 500 takes the top slot because it does the one thing that is hardest to fake: it shows its work. The product page carries a dated certificate of analysis image for the batch, and the NMN itself is Uthever, a branded raw material with third-party purity verification behind it rather than an anonymous bulk ingredient. When purity carries the heaviest weight in a scoring system — and for a compound sold on the promise of cellular precision, it should — that documentation trail is worth more than any marketing claim.

Key specs: 60 capsules per bottle, 500 mg NMN per 2-capsule serving, 30 servings per bottle.

Priced at $115.97 for a 3-pack on prohealth.com as of August 2, 2026, which works out to $38.66 per bottle and $1.29 per 500 mg of NMN.

Pros:

• Per-batch certificate of analysis published on the product listing
• Uthever branded NMN with independent purity verification
• Long-established US longevity brand with deep review history
• Multi-pack pricing meaningfully reduces the per-dose cost

Cons:

• Costs roughly 2.3× more per 500 mg of NMN than the cheapest option here
• Requires 2 capsules for a 500 mg dose, which halves servings per bottle
• The $38.66 unit price depends on buying three bottles at once

Best for: Buyers who want the strongest available paper trail on purity and are willing to pay a premium for it.

2. Eternal Elixir NMN 500mg — Best Value Per Dose

Eternal Elixir NMN 500mg is the cheapest way to hit a clinically relevant NMN dose in this comparison, and it is not close.

At $49.99 for 90 capsules with 500 mg of NMN in each single capsule, the cost works out to $0.56 per 500 mg — less than half the next-cheapest product in the table.

It is also a single-active formula: NMN, rice flour as a carrier, and a cellulose capsule shell. Nothing else is in there, and the label says so.

Key specs: 90 capsules per bottle, 500 mg beta-nicotinamide mononucleotide per capsule, 90 single-capsule servings.

$49.99 at the time of writing, reduced from a $64.99 list price. Third-party tested, GMP-certified manufacturing, shipped from the US.

Pros:

• Lowest cost per 500 mg of NMN in this comparison at $0.56
• 500 mg in a single capsule — no doubling up to reach the dose
• 90 capsules is roughly a three-month supply at one per day
• Sits inside a 20-product range, so pairing NMN with a trans-resveratrol supplement or another NAD-adjacent active does not mean a second checkout
• Free shipping on US orders over $100

Cons:

• The exact purity percentage is not published on the listing, unlike ProHealth’s COA
• A newer brand with a shorter public review history than the legacy US names
• The $49.99 figure is a promotional price, not the $64.99 list price

Best for: Anyone planning to take NMN daily for a year or more, where the per-dose gap compounds into real money. View NMN 500mg →

One practical note on stacking: because Eternal Elixir also carries Nicotinamide Riboside 500mg, Trans-Resveratrol 600mg and cellular-aging actives like Ca-AKG, buyers building a broader longevity routine can consolidate rather than juggle four brands and four shipping charges.

3. Wonderfeel Youngr NMN — Best High-Dose Formula

Wonderfeel Youngr NMN is the most ambitious formulation in this group. Rather than selling NMN alone, it delivers 900 mg of NMN per serving alongside 100 mg resveratrol, 20 mg hydroxytyrosol, 4 mg ergothioneine and 20 mcg vitamin D3 — a combination the brand holds a patent on. The formula was developed with physician input, and the 900 mg figure is deliberately pegged to the top dosing arm of published dose-ranging work.

Key specs: 900 mg NMN per serving plus a four-ingredient antioxidant complex, per the brand’s own ingredient breakdown. Fortune’s October 2025 roundup listed it at $3.26 per serving, which normalizes to roughly $1.81 per 500 mg of NMN. Our full Wonderfeel Youngr NMN review breaks the formula down ingredient by ingredient.

Pros:

• Highest NMN dose per serving in this comparison at 900 mg
• Antioxidant co-formulation is genuinely distinctive rather than a token addition
• Named physician associated with the formulation
• Consistently cited by major publications and AI summaries of this category

Cons:

• Expensive per unit of NMN once you normalize for the 900 mg serving
• Bundled antioxidants are wasted spend if you already take resveratrol separately
• Whether the antioxidant combination improves NMN outcomes has not been demonstrated in a finished-product trial

Best for: Buyers who want the higher end of the studied dose range in one product and are not price-sensitive.

4. Eternal Elixir NMN Advanced Longevity Complex 1200mg — Best All-in-One

The Eternal Elixir NMN Advanced Longevity Complex exists for people who have already read enough about NAD biology to want more than one lever. Each 2-capsule serving carries 500 mg NMN, 250 mg TMG, 200 mg pterostilbene, 100 mg trans-resveratrol, 100 mg quercetin phytosome and 50 mg apigenin — 1,200 mg of total actives. Worth being precise about the label, because it trips people up: the 1200 mg on the front is the combined total of all six actives, not the NMN dose.

Key specs: 60 vegan capsules per bottle, 30 servings at 2 capsules each.

$64.99, reduced from $79.99. That is $2.17 per serving — the highest per-500 mg-NMN figure in this comparison, which makes sense given five additional actives are along for the ride.

Pros:

• Six actives with individually declared amounts — no proprietary blend hiding the doses
• Replaces four or five separate bottles for anyone running a broad longevity routine
• TMG is included, which methyl-donor-conscious buyers usually have to source separately
• Clear front-label explanation that 1,200 mg is a total, not the NMN dose

Cons:

• Most expensive per 500 mg of NMN in this comparison at $2.17
• 60 capsules per bottle, not 90 — a 30-day supply, so reorders come faster
• The finished six-active formula has not been tested as a unit in a clinical trial
• You cannot adjust individual ingredient doses independently

Best for: Buyers replacing a multi-bottle stack with one product. View the Advanced Longevity Complex →

5. PartiQlar Pure NMN — Best Single-Ingredient Purity Play

PartiQlar Pure NMN is the product most frequently named first when large publishers and AI summaries answer this question, and its pitch is narrow by design: plant-based NMN at a stated purity above 99%, with nothing else in the capsule. For buyers who treat any additional ingredient as an unnecessary variable, that minimalism is the entire appeal.

Key specs: 500 mg NMN per serving, single-ingredient formulation. Our standalone partiQlar review covers the brand in more depth. Fortune’s October 2025 roundup listed it at $1.08 per 500 mg serving — we have not independently re-verified that figure at the time of writing, so check the brand’s current pricing.

Pros:

• Purity claim above 99% is stated explicitly rather than implied
• Single-ingredient formula with no bundled extras to pay for
• The most-cited product in major published roundups of this category

Cons:

• Roughly double the cost per 500 mg of the cheapest option here
• Narrow product range if you later want to add adjacent actives
• Our quoted price is second-hand and dated October 2025

Best for: Purity-first buyers who want one ingredient and nothing else.

6. Eternal Elixir VitaSolutions NMN + Resveratrol 1100mg — Lowest Entry Price

At $35.00, the VitaSolutions NMN + Resveratrol 1100mg has the lowest sticker price of any product in this comparison, and the arithmetic on the front label is refreshingly literal: 500 mg NMN plus 600 mg trans-resveratrol equals the 1,100 mg headline.

No proprietary blend, no rounding games. Black pepper extract is also on the panel, though the listing is candid that its amount is not legible enough to state.

Key specs: 500 mg NMN and 600 mg trans-resveratrol per labeled serving. $35.00, reduced from a $64.95 list price.

Pros:

• Lowest entry price in the comparison at $35.00
• Both actives declared at specific amounts rather than hidden in a blend
• Covers the NMN and resveratrol bases in one purchase — useful if you were weighing NMN against resveratrol and would rather not choose
• Fast US shipping, free over $100

Cons:

• Servings per container are not declared on the product listing, so cost per dose cannot be calculated — the single biggest weakness of any product here, and it is one of ours
• Black pepper extract amount is not stated
• The NMN-plus-resveratrol combination has not been tested as a finished formula

Best for: Buyers who want both actives at the lowest upfront cost and are willing to read the physical bottle for serving details. View VitaSolutions NMN + Resveratrol →

7. Nutricost NMN — Best Budget Big-Box Option

Nutricost NMN is the default recommendation in most mainstream buying guides, and the reason is distribution rather than distinction. It is a straightforward 500 mg single-ingredient NMN capsule from a high-volume US supplement manufacturer, stocked widely enough that most buyers can get it in two days without thinking about it.

Key specs: 500 mg NMN per serving, single-ingredient. Fortune’s October 2025 roundup listed it at $1.13 per 500 mg serving; we have not independently re-verified that price.

Pros:

• Extremely wide US availability across major marketplaces
• Simple, single-active formula with no bundled extras
• Named in multiple independent published roundups

Cons:

• Roughly twice the cost per 500 mg of the cheapest option in this table
• Marketplace listings vary in price and freshness depending on the seller
• Less detailed purity documentation than the branded-ingredient products

Best for: First-time NMN buyers who value fast, familiar retail delivery over per-dose economics.

8. Doctor’s Best NMN + CoQ10 — Best Retail-Shelf Pick

Doctor’s Best NMN + CoQ10 earns its place mostly on ubiquity. It is one of the most visible NMN products on US marketplaces, and it pairs NMN with CoQ10 on a mitochondrial-support rationale. The logic is coherent — both compounds sit near cellular energy production — though the pairing has not been shown to outperform either ingredient on its own.

Key specs: NMN combined with CoQ10; exact per-serving amounts vary by product version, so read the current panel. Pricing varies by retailer and seller, which is why we have not assigned it a cost-per-dose figure.

Pros:

• Very easy to find on major US marketplaces
• CoQ10 pairing suits buyers already taking it separately
• Established mainstream supplement brand

Cons:

• Marketplace pricing is inconsistent, making value hard to pin down
• Bundled CoQ10 is redundant spend if you already supplement it
• Delivers less transparency on NMN sourcing than the branded-ingredient options

Best for: Buyers who want NMN and CoQ10 in one bottle from a familiar retail brand.

To be explicit about what this award is and is not, because most lists of the best NMN supplements blur exactly this line: it is a value award, decided on cost per 500 mg of NMN, a number we computed from the current listed price. It is not a claim that Eternal Elixir is the best product overall. On documented purity, ProHealth leads, and we ranked it first accordingly.

How We Evaluated the Best NMN Supplements

We did not run laboratory tests on competitor products, and we are not going to imply otherwise. This comparison is built from label-declared specifications, publicly available purity documentation, prices read from sellers’ own US storefronts, and published human research. Where a figure came from someone else’s reporting, the row says so.

Five criteria, weighted:

• Quality and purity documentation (30%) — is there a published certificate of analysis, a branded raw material with independent verification, or a stated purity percentage? Marketing adjectives scored nothing.
• US availability and shipping speed (20%) — does it ship domestically, and how fast?
• Cost per 500 mg of NMN in USD (20%) — normalized so every product is measured against the same unit.
• Product range for stacking (15%) — can you add adjacent actives from the same seller in one order?
• Customer reviews and brand reputation (15%) — length and depth of public track record.

Applying those weights honestly is what put ProHealth ahead of our own products.

Purity documentation carries the single heaviest weight, and ProHealth publishes a per-batch certificate of analysis while Eternal Elixir’s listings state third-party testing without publishing a purity percentage.

That is a real difference, and pretending otherwise would make this list worthless.

Where Eternal Elixir wins, it wins on arithmetic rather than opinion: the lowest cost per 500 mg of NMN, and the broadest same-cart range for anyone whose routine extends beyond NMN into mitochondrial support or other longevity actives.

How to Choose an NMN Supplement Without Getting Fooled by the Label

Four things separate a good NMN purchase from an expensive one.

Check the serving size before the price

This is the single most common trap. Two products can both advertise “500 mg” while one delivers it in a single capsule and the other needs two. The two-capsule product halves your servings per bottle, which means it costs twice as much per dose as a naive price comparison suggests.

In this comparison, ProHealth’s 60-capsule bottle contains 30 servings while Eternal Elixir’s 90-capsule bottle contains 90. Same category, three times the doses.

Do the division yourself

Take the price, divide by servings per container, then adjust for how much NMN is actually in a serving. Published roundups routinely place a $1.08 figure for a 500 mg product next to a $3.26 figure for a 900 mg product as though the two are comparable.

They are not. Normalizing to a common unit — we used 500 mg — changes the ranking substantially.

Look for documentation, not adjectives

“Pharmaceutical grade” and “ultra-pure” are unregulated marketing terms with no fixed meaning. A dated certificate of analysis, a named branded raw material, or a stated purity percentage are checkable. Prefer the checkable ones.

Decide if a blend is actually worth it

Combination formulas can be excellent value if you were going to buy the extra ingredients anyway, and poor value if you were not. If you already take resveratrol, paying a premium for a formula that bundles 100 mg of it is a downgrade, not an upgrade. If you are starting from zero and want fewer bottles, the reverse is true. The same reasoning applies to adjacent longevity actives such as calcium alpha-ketoglutarate: buy the bundle only if you would have bought the parts.

Apply those four checks and most of the best NMN supplements sort themselves into two groups — products competing on documented purity, and products competing on cost per milligram. Very few compete on both.

What the Research Actually Shows About NMN

Research published in GeroScience in 2023 reported on a randomized, multicenter, double-blind, placebo-controlled trial in 80 healthy middle-aged adults, who took placebo, 300 mg, 600 mg or 900 mg of NMN once daily for 60 days. Blood NAD concentrations rose significantly in all three NMN groups at both day 30 and day 60 compared with placebo and with baseline, with the highest concentrations in the 600 mg and 900 mg groups.

Six-minute walking distance also increased significantly in all treated groups versus placebo. The authors concluded that supplementation was well tolerated up to 900 mg daily and that clinical efficacy peaked at 600 mg. The trial was registered as NCT04823260. Read the trial on PubMed, or view the registration record.

Two caveats belong next to that result, and they are the kind that buying guides tend to leave out. First, the study ran for 60 days — it measured a biomarker and a walking test, not long-term health outcomes, and it did not establish lifespan extension. Second, the published conflict-of-interest statement discloses that the first author was an employee of a company selling NMN raw material and two further authors were employed by a chemical supplier. That does not invalidate a registered, placebo-controlled, double-blind trial, but it is context a reader deserves and one we have not seen mentioned in any competing roundup.

The independent trial that complicates the story

An independent trial from Washington University School of Medicine, published in Science in 2021, approached the question from a different angle: it tested NMN in overweight or obese postmenopausal women with prediabetes. Supplementation improved insulin sensitivity in muscle — a functional outcome rather than a biomarker — but the researchers did not detect a change in muscle NAD content. That pairing complicates the tidy “NMN raises NAD, and NAD does the work” story most product pages tell. It also carries no supplement-industry sponsorship, which makes it a useful counterweight to the trial above (Yoshino et al., Science, PMID 33888596).

For a broader view, a 2022 review in the Journal of Advanced Research surveyed NMN as an anti-aging health product, covering both its proposed mechanisms and open safety questions (DOI: 10.1016/j.jare.2021.08.003).

It is a review rather than a trial, and it treats the human evidence base as promising but still developing — which is the honest summary of where NMN stands. Studies suggest NMN raises NAD levels in humans; they do not show that any supplement reverses aging.

Frequently Asked Questions

Do NMN supplements actually work?

It depends on what you mean by work. In a randomized, placebo-controlled trial published in GeroScience, daily NMN significantly raised blood NAD concentrations at 30 and 60 days across 300 mg, 600 mg and 900 mg doses, and improved six-minute walking distance versus placebo.

So the biomarker effect has human support. What has not been demonstrated is that raising NAD produces long-term healthspan or lifespan benefits in people. Treat NMN as a well-tolerated compound with a measurable biological effect, not as proven anti-aging.

How do I choose the right NMN supplement?

Compare the best NMN supplements on serving size before price. Check how many capsules make up one serving and how many servings are in the bottle, then divide the price by servings to get a real per-dose cost.

Next, look for checkable quality evidence — a dated certificate of analysis or a named branded raw material beats phrases like pharmaceutical grade. Finally, decide if you want standalone NMN or a blend; blends only make sense if you would have bought the extra ingredients anyway.

What is the best NMN dosage per day?

The GeroScience dose-ranging trial found that blood NAD rose at 300 mg, 600 mg and 900 mg daily, with the strongest overall results at 600 mg and good tolerance up to 900 mg. That makes roughly 500–600 mg a day a reasonable target for most adults, which is why most products in this category are built around a 500 mg serving. Individual needs vary, so speak with a qualified healthcare professional before starting.

How much should the best NMN supplements cost per 500 mg?

Across the eight products compared here, the cost of 500 mg of NMN ranged from $0.56 to $2.17 — a spread of nearly four times.

Anything under about $1.00 per 500 mg is genuinely good value in the current US market.

Above roughly $1.80 you are usually paying for bundled extra ingredients rather than NMN, which may or may not be worth it depending on what else you take.

What is the difference between NMN and NR?

Both are NAD precursors, meaning the body can use either to help produce NAD, but they sit at different points in the pathway and are chemically distinct.

NR (nicotinamide riboside) has been on the market longer and has its own body of human research; NMN is one step closer to NAD in the biosynthesis route. Neither has been shown to be decisively superior in people. Some buyers rotate or run them side by side.

Is NMN better taken with resveratrol?

The rationale is that NMN supplies the NAD precursor while resveratrol is associated with sirtuin activity, so the two are often marketed as complementary. It is a plausible formulation logic, but no finished NMN-plus-resveratrol product has been shown in a clinical trial to outperform NMN alone. If you want both, a combination product can save money; if you only want NMN, you are not missing a proven benefit by skipping the pairing.

How long does NMN take to work?

In the GeroScience trial, blood NAD concentrations were already significantly elevated at the first measurement point, day 30, and remained elevated at day 60. Physical performance differences on the six-minute walking test were also measurable by day 30. Biomarker changes therefore appear within roughly a month of consistent daily use.

Subjective effects vary considerably between individuals, and some people notice nothing.

Can you take NMN long term?

The longest well-controlled human data in this dose range covers 60 days, in which NMN was well tolerated at up to 900 mg daily with no safety issues identified from adverse events, laboratory measures or clinical monitoring. Longer-term safety in humans has not been established at this level of rigor, which is a genuine gap rather than a reassurance. Anyone taking medication or managing a health condition should consult a qualified healthcare professional first.

Is there a downside to taking NMN?

Three, and none of them are dramatic. First, cost: a clinically relevant 500 mg daily dose is an ongoing monthly expense, and the cost per 500 mg in the comparison above ranges from $0.56 to $2.17 — a 3.9× spread for the same nominal dose. Second, the evidence gap: the best-controlled human data at these doses runs 60 days, so longer-term outcomes are unstudied rather than reassuring.

Third, tolerability is not a blank check — NMN was well tolerated up to 900 mg daily in that trial with no safety issues identified, but well tolerated by 80 people over two months is not the same as proven safe indefinitely. Anyone taking medication or managing a health condition should speak with a qualified healthcare professional first.

What is the difference between NMN and NAC?

They are unrelated compounds that get confused because the acronyms look alike. NMN — nicotinamide mononucleotide — is a NAD precursor: your cells convert it, one enzymatic step, into nicotinamide adenine dinucleotide, the coenzyme central to cellular energy metabolism. NAC — N-acetylcysteine — is an amino acid derivative and a precursor to glutathione, the body’s main intracellular antioxidant.

Different molecules, different pathways, different reasons to take them. If you are weighing one against the other you are really choosing between NAD support and antioxidant support, and nothing stops you from running both.

What should you avoid when taking NMN?

Three things, in order of how often they actually cause a problem.

First, avoid assuming the front-label number is the NMN dose. On multi-active formulas the headline milligram figure is frequently the combined total of every ingredient — the 1,200 mg complex in this comparison contains 500 mg of NMN, not 1,200 mg. Reading the total as the NMN dose is the single most common buying error in this category.

Second, avoid stacking a second NAD precursor without checking. If you already take nicotinamide riboside, adding NMN is doubling up on the same pathway rather than covering a new one. Check your existing label first — our comparison of NAD+ boosters lays out which precursor sits in which product.

Third, avoid treating an unverified purity claim as equivalent to a published one. Several products in this comparison state a purity percentage; fewer publish a per-batch certificate of analysis you can open and read. That distinction is the main quality signal available to a buyer, and it costs nothing to check before ordering.

Beyond the label: if you take prescription medication, are pregnant or breastfeeding, or manage a diagnosed condition, confirm the addition with a qualified healthcare professional rather than assuming a supplement is inert.

Why do I feel different when I start taking NMN?

Most people report nothing at all, and that is the expected outcome. In the dose-ranging trial discussed above, supplementation was well tolerated across 300, 600 and 900 mg daily arms over 60 days, with efficacy on the trial’s walking-distance measure peaking at 600 mg rather than at the highest dose — more was not better, and the tolerability signal held throughout.

When people do notice something in the first days, mild digestive unsettledness is the usual report, and taking the capsule with food generally resolves it. Some also describe a subjective change in energy; that is a self-reported impression rather than a measured trial outcome, and expectation plays a well-documented role in how any new supplement feels in the first week.

What is worth acting on rather than waiting out: anything persistent, anything that started alongside a new prescription, or anything that feels out of proportion. Stop and speak with a qualified healthcare professional. NMN supports a normal metabolic pathway; it is not a stimulant, and a strong acute reaction is not something to push through.

The Verdict: Which of the Best NMN Supplements Should You Buy?

There is no single winner across every buyer, which is why the best NMN supplements for you depend on which of the five criteria you weight hardest.

If documentation matters most to you, buy ProHealth Longevity NMN Pro 500. The published per-batch certificate of analysis and branded Uthever raw material give it the strongest verifiable purity trail here, and that is worth paying for if it is what you optimize for.

If you are taking NMN daily and value matters, buy Eternal Elixir NMN 500mg. At $0.56 per 500 mg it is the cheapest route to a clinically relevant dose in this comparison, delivers the full 500 mg in a single capsule, and 90 capsules covers roughly three months.

If you want the top of the studied dose range in one product, Wonderfeel Youngr NMN delivers 900 mg plus an antioxidant complex — provided you accept the price per unit of NMN.

If you are buying a blend or shopping on entry price

If you are consolidating a multi-bottle stack, the NMN Advanced Longevity Complex replaces several purchases with one 30-serving bottle, at a higher cost per milligram of NMN but a lower total cost than buying six actives separately.

If you want the lowest upfront spend, the VitaSolutions NMN + Resveratrol at $35.00 is the cheapest entry point — with the caveat that you will need the physical bottle to work out servings per container.

Whichever you choose, the discipline that matters is the same one that produced this ranking: convert everything to the same unit before you compare, and prefer documentation over adjectives. Buyers who apply that to men’s longevity actives generally — from NMN to shilajit — make better decisions than buyers who read the front of the bottle.