2018 pilot study liposomal glutathione tri fortify Rhode Island Nutrition Therapy — Researched Nutritionals Tri-Fortify (8 ounce tube) Tri-Fortify® Liposomal Glutathione, Watermelon (8
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Yuan et al., 2021)

The copper content of GHK-Cu formulations has been a theoretical safety consideration, given that excessive copper can be toxic - however, the amounts used in cosmetic and research applications are extremely small, the copper is tightly chelated by the peptide (reducing free copper availability), and topical absorption of copper from these products appears minimal and well below levels that would cause systemic copper accumulation or toxicity

Weihua Q, Andreas S, Enes U, Susanne L, Joel R, M Cristina C, et al
In addition, Serine and arginine rich splicing factor 9 (SFRS9) can upregulate the expression of GPX4 by binding to GPX4 mRNA, which promote the growth of CRC, while SFRS9 knockdown significantly inhibited tumor growth in nude mice (Wang R
