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2.They aid in energy metabolism and fat burning, complementing diet and exercise for weight loss

According to a 2025 study published in MDPI Pharmaceutics, intravenous glutathione achieves 100% bioavailability, whereas oral glutathione typically exhibits bioavailability below 1% due to rapid hydrolysis by intestinal enzymes

This coordination stabilizes copper in a biologically available form, allowing it to interact with cellular targets without generating oxidative stress. The copper ion also acts as a catalytic cofactor in enzymes involved in collagen cross-linking, antioxidant defense, and wound remodeling

However, in three samples declared as containing AAS or BPC-157, in addition to the declared API, contamination with undeclared raloxifene was present, together with chlorodehydromethyltestosterone, ibutamoren, and SR9009 (Table 2)

Unlike products that provide temporary plumping or instant cosmetic effects, GHK-Cu is generally viewed as a long-term skin-support ingredient