What each ingredient does, the dose that works, and how strong the research is. In plain English, with every claim linked to a study.
Strongest evidence first within each group.
Consistent benefit across meta-analyses and systematic reviews, or an authorised health claim.
Several good trials that are mostly positive, or strong only in one context, such as a deficiency.
A few trials with small or inconsistent effects.
No convincing human evidence, or evidence against.
Grades describe the research, not the product. We prefer authorised health claims, then systematic reviews and meta-analyses, then single human trials. Every source is checked before a guide is published.