Editorial policy

DRAFT – replace. Working policy for Sameer to confirm.

Sources

We link to the research behind our guides and news (journal papers, trial registries, official guidance). If we can’t source a claim, we leave it out.

Evidence strength

Each supplement guide shows a simple five-step meter. It describes the strength of the research on healthy-aging goals, not a promise that something will work for you.

• Grade A – Strong: consistent benefit across large trials or reviews.
• Grade B – Good: benefit for specific outcomes in several trials, with gaps.
• Grade C – Mixed: mixed or mostly null results in large trials, or benefit only in some groups.
• Grade D – Early: small or short human trials only.
• Grade E – Very early: animal or lab research only.

Independence and how we choose

Affiliate commission never changes an evidence grade, a ranking or what we say. See our affiliate disclosure and how we rank.

When we compare products we look at the form and dose of the active ingredient, independent testing, the ingredient list and price per serving. We say plainly when we haven’t tested a product ourselves.

Updates and corrections

Guides show when they were last reviewed. If you spot a mistake, tell us and we’ll fix it.