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Notably, endogenous GHK-Cu levels in human plasma are age-dependent, dropping from ~200 ng/mL at age 20 to below 80 ng/mL after age 60
Probably because the studies, although promising, were not considered to have any major therapeutic benefit
Additionally, selenoproteins such as thioredoxin reductase and glutathione peroxidase have a protective function for the thyroid gland
The choice usually depends on tolerance, convenience, regulatory access, and cost not a clear human-efficacy ranking
Following standard protocols and cycling your use prevents this concern
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