Clean Supplements UK Ultra Pure NMN wins on the one thing that actually matters in this category: purity. Most NMN products either cut the raw material with cheap fillers or bury it inside a blend, so you never really know how much active NMN you're getting. Clean does the opposite. Every capsule is 500mg of high-purity NMN, the most direct precursor your body uses to make NAD+, and nothing else.
Turn the pouch over and the "other ingredients" list is one line: a vegetarian capsule shell. No magnesium stearate, no silicon dioxide, no bulking agents, no colours. That matters, because NAD+ naturally declines with age and NMN is only worth taking if what's in the capsule is actually NMN, not padding. It's one capsule a day, non-GMO, made in the UK, and backed by Buy 4, Get 1 Free. If you want NMN, this is NMN, not a blend padded with co-ingredients you didn't ask for.
AgeMate is the closest thing to real competition here, and for the right reason: it uses NMN, and it uses it at 500mg. That alone puts it ahead of everything below it, because the other three are working with molecules your body handles less efficiently.
Where it separates from the top pick is focus. Eighteen ingredients in one serving means the NMN is sharing space with spermidine, vitamins, choline, theanine and a powder base, and the more a formula carries, the harder it becomes to know what's earning its place. If you want a broad longevity stack in one scoop, this is a reasonable way to get it. If you want NMN, you're paying for a lot of things that aren't NMN.
Cata-Kor is a well-executed version of the wrong idea. The liposomal shell is a real technology and the third-party testing is genuine, but the problem it's solving isn't the problem that matters. NAD+ struggles to reach your cells because of what the molecule is, not because of how it's wrapped.
The 500mg number looks identical to the top pick's on paper, and that's exactly why this card is worth reading carefully. Same figure, different molecule, different result. Trans-resveratrol adds a mild supporting angle, but there's no NMN in the bottle, which means there's no direct conversion pathway behind any of it.
Tru Niagen is the most heavily marketed name in this category and its testing credentials are the real thing. Nicotinamide riboside is a genuine NAD+ precursor, so this isn't a product built on nothing.
It's just a longer route. NR has to convert to NMN before it can become NAD+, so you're paying for an extra step your body has to take. Pair that with a 300mg dose that sits below where human research points, and you have a product doing less than its price and reputation suggest. Recognisable, well-tested, and still the slower path.
Nutricost sells the biggest number on this page. A thousand milligrams sounds like it should beat 500mg twice over, and that instinct is exactly what this product is priced around.
But the NAD+ molecule can't cross into your cells intact, so the dose on the label and the dose that reaches your mitochondria are two very different figures. Doubling a number that can't get where it's going doesn't double anything. There's no precursor in the bottle to bridge that gap. As a cheap way to say you take NAD+, it works. As a way to actually raise your NAD+, it's the weakest option here.
Pure Clean NMN by Clean Supplements