A full 1,000 mg of pure NMN in one scoop, with nothing else in the jar. 100 servings — about a three-month supply.

Here is the uncomfortable thing about the NMN aisle. Four of the five products on this page give you 500 mg a serving. The research everyone quotes for NMN is not built on 500 mg. So you are quietly signed up for two servings a day, which doubles what you pay and halves how long the tub lasts.

Cedar-Labs is the one that simply gives you the full 1,000 mg in a single scoop. One scoop, once, in the morning. That is the entire routine, and it is the main reason this finished first.

Then there is the label. Turn the jar around and the ingredients panel reads: 1,000 mg pure NMN. Other ingredients: none. No rice flour, no magnesium stearate, no gelatin shell, no proprietary blend hiding the dose. In a category where "NMN supplement" often means NMN plus four cheaper things, a single-ingredient label is rare, and it means every gram you pay for is the active.

It is powder rather than capsules, which sounds like a detail until you do the arithmetic. Matching 1,000 mg out of a 500 mg capsule means four capsules a day. Cedar-Labs is one scoop into water, and their reviews are full of people making the same point — one customer put it as "I'm terrible at swallowing pills, one scoop in my morning drink is so much easier."

The jar holds 100 g, which is 100 full servings and roughly three months. A 60-capsule bottle at two a day is gone in a month. Work it back to a daily figure and Cedar-Labs lands at about 28¢ a day.

It is third-party tested for purity and potency, non-GMO, and free from gluten, soy, dairy and synthetic additives. Behind it sit 3,661 reviews at 4.8 stars — the deepest track record of anything here — and a 60-day money-back guarantee, which is longer than most people need to know whether something is working for them.

Uthever® NMN at a full 1,000 mg, stacked with 1,000 mg resveratrol and 500 mg TMG. Capsules.

The only other product here that gives you a full 1,000 mg of NMN, and the most serious competitor of the four. ProHealth pairs Uthever®-branded NMN with resveratrol and TMG, and the brand has genuine longevity credentials. Whether that is a strength depends on what you came for. If you want a built stack in one bottle, this is the pick. If you want to know exactly what is doing what, or you already take resveratrol separately, you are paying for three actives to get one. It is also capsules, so a full serving is several to swallow rather than a single scoop.

Pure NMN in a fast-dissolve powder. 4.4 stars from 538 reviews.

The closest thing to our #1 on this page, and the only other pure-NMN powder of the five. Renue By Science is well regarded in the longevity space, the powder is built to dissolve quickly, and the format sidesteps capsules entirely. If Cedar-Labs did not exist this is what we would point you at. The gap is the dose. At 500 mg a serving you are taking two scoops to reach the 1,000 mg Cedar-Labs gives you in one, so the pouch empties twice as fast and the real cost per day is double what the sticker suggests.

Single-ingredient NMN in capsules. The highest star average here at 4.6, from 209 reviews.

The best-rated product on this page by star average, and a clean single-ingredient positioning. The people who buy it clearly like it. Two things keep it mid-table. It carries the same 500 mg serving as most of the category, so reaching 1,000 mg means doubling up. And that 4.6 rests on 209 reviews, a much shallower base than the 3,661 behind our #1 — a high average on a small sample tells you less than a slightly lower one on a large one.

60 capsules at 500 mg. The most widely available of the five. 4.1 stars from 53 reviews.

The easiest of the five to simply pick up, from a brand plenty of people already have something else from. As a low-commitment way to try NMN it does the job. On the numbers it finishes last. The 500 mg serving means 60 capsules is one month at a single capsule, or two weeks if you double to 1,000 mg, against roughly three months from our #1. It also carries the lowest star average here at 4.1, on the smallest review base at 53.