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Tendon and ligament research
GHK-Cu is found naturally in human plasma, saliva, and urine, and its concentration in plasma declines significantly with age, from approximately 200 ng/ml at age 20 to around 80 ng/ml by age 60
A 2025 narrative review by Alzahrani and Alotaibi in Cureus reached a similar safety conclusion, noting that long-term safety and optimal dosing of glutathione supplementation for skin lightening require larger trials before firm recommendations can be made
We are thus left with poorly studied experimental drugs referred to as peptides, although some are not, sold for research use only, though clearly meant for human consumption, to gain a wide array of physical benefits that are unlikely to manifest
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