Trans-Resveratrol
Trans-Resveratrol is a unrated form of Resveratrol, used in 661 on-market products .
661
on-market products
unrated
quality tier
n/a
elemental fraction
Why this tier: The biologically relevant isomer and what most products declare, but the human trials verified here report "resveratrol" without isomer detail in the abstract, and trans vs unspecified was not compared; not ranked. Human exposure to free resveratrol is low relative to its glucuronide/sulfate conjugates (up to ~20-fold higher AUC for metabolites at 0.5-5 g/day).
Source: Brown VA et al. 2010, Cancer Res 70(22):9003-9011, PMID 20935227