There were several press articles recently on drug testing; it seems some men with two copies of a certain gene, do not test positive for testosterone using the standard urine test for testosterone glucuronide. They don't metabolize it that way due to a genotypic variant in the UGT2B17 enzyme. It was a stated that 60% of East Asians have this gene combination, whereas only 10% of Europeans do. This gene combination should result in much higher serum levels for a given dose of resveratrol, as well as for many drugs, including morphine.
The paper “Doping Test Results Dependent on Genotype of UGT2B17, the Major Enzyme for Testosterone Glucuronidation” will appear in the June issue of [Journal of Clinical Endocrinology & Metabolism] JCEM, a publication of The Endocrine Society
Steroid Report
Large Differences in Testosterone Excretion in Korean and Swedish Men Are Strongly Associated with a UDP-Glucuronosyl Transferase 2B17 Polymorphism
http://jcem.endojour...t/full/91/2/687