Bianca Reyes

How creatine works, and where the evidence stops

The mechanism is well described and the performance evidence is narrow but consistent. The cognitive evidence is thinner, and the label claims are the manufacturers' own.

How Creatine Monohydrate Actually Works in Muscle: The Evidence

Creatine is one of the most-studied supplements in sports nutrition. Here is what the research actually shows about its mechanism, its effects on strength, and where the evidence runs thin.

FTC sends refund checks over unproven supplement health claims

Does biotin actually help hair, skin and nails?

Vitamin D and immunity: what the trials actually show

Large randomized trials have tested whether vitamin D prevents respiratory infections — the answer is a modest effect mostly in people who started deficient, and no demonstrated benefit against colds in the general population.

NAC is back on supplement shelves. Here's what changed, and what didn't

The FDA confirmed in 2024 it does not object to NAC in dietary supplements, ending a four-year limbo — but the compound's efficacy evidence remains narrow, and the policy story is the real news.