The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
niacin if you go to the store and you buy niacin it is usually nicotinic acid it can also be nicotinamide which is also known as niacin amide but those are very different molecules right and so there are different pathways by which nicotinamide and nicotinic acid become nad but they all become nad
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you said maybe it wouldn't be a good idea to take nicotinamide and a lot of people may be taking nicotinamide as niacin quote-unquote but from an enzymatic perspective if you are taking nicotinamide could that could that inhibit this it doesn't hit at
And so, NAD is recycled in the body because there's grams of it, you can't eat that much easily. And there's a cycle, it's called the salvage pathway of NAD. And it all starts with nicotinamide, which is a form of niacin, vitamin B3. But you can't just... Well, you can, but it's not very effective, just overdose on vitamin B3 because you need other things to make the big molecule, NAD.