Cluster

Nutrition

Before asking whether a supplement does anything, it is worth asking what is actually in it. For some categories that is a real question with a documented answer, and for others the honest answer is that nobody has published enough to say.

We start with purity and sourcing because those are questions laboratory documents can answer. We do not make claims about disease, and we do not repeat manufacturers' claims as though they were findings.

Nutrition is on this site for the same reason water is: it is an input. And the useful questions here turn out to be documentary rather than physiological — what is in the bottle, who tested it, and what the report does not say.

Guides and reviews