One reason for this is that the level of glutathione will fluctuate throughout the day from its lowest in the early morning to depletion from routine exposure to toxic substances (like alcohol), pathogens, cigarette smoke, car exhaust, drugs, certain foods, stress level, illness, and many similar factors, so repeated testing could be required to set a baseline
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these effects are magnified when combined with carnitine or CoQ10 co-therapy ( 1 day 1 oral riboflavin, with sustained biochemical normalization at two-year follow-up ( n = 42, 2025) confirm doseresponse benefits and highlight early treatment ( C (p.Met340Thr) showed that riboflavin deficiency further reduced AIFM1 protein, while high-dose riboflavin partially reversed this loss and improved respiratory chain activity (53)
WADA does not currently list GHK-Cu as a prohibited substance, although athletes are typically advised to confirm current prohibited-substance lists for their sport