How we evaluate resveratrol supplements. This page explains exactly what we score on, what weight each factor carries, and — importantly — what we do not do.
We prefer products that disclose percentage of trans-resveratrol (the bioactive form), not just total resveratrol. Products with a stated trans-resveratrol percentage of 98%+ score higher. Proprietary blends that hide ingredient amounts score lower.
We check whether the brand publishes a Certificate of Analysis from an independent lab. A COA that anyone can look up scores highest; "we test in-house" claims with no public documentation score lower.
We compute price per mg of trans-resveratrol, not price per capsule. A cheap-per-capsule product with 50% purity is worse value than a premium product at 98% purity.
We look at how long the brand has been operating, whether they have a clear contact address, customer-service responsiveness, and return policy.
Bonus points for liposomal delivery, BioPerine, or other absorption enhancers backed by published research. We do not award points for marketing language alone.
Every review carries a "Published" and "Last updated" date. We re-check pricing and stock at minimum quarterly, and re-score whenever a brand reformulates or changes its testing policy. If we materially change a ranking, we note what changed and why.
We earn affiliate commissions when readers buy through our links. Commission rate does not affect ranking position. We have refused commissions from brands we won't recommend, and we have ranked products that pay us nothing above products that pay us more. See our editorial policy for the full firewall.
Last updated: 2026-05-15