Evidence Quality Summary The honest assessment: mechanistic data is compelling, animal data is supportive, and human data exists but is not conclusive for GHK-Cu alone
Glutathione is frequently called the "master antioxidant." It is a tripeptide, which simply means it is made of three amino acids: cysteine, glycine, and glutamic acid
Toxic metals in toenails as biomarkers of exposure: A review
Glutathione is a powerful antioxidant made naturally by the body
PMID: 27423583
More recently, a randomized, double-blind, placebo-controlled trial in 215 men, aged 35 to 55 years, examined the effects of supplemental B vitamins (at 3 to 13 times the current RDA, except for folic acid which was included at a dose equivalent to the RDA), vitamin C (500 mg/day), and the minerals, zinc (10 mg/day), calcium (100 mg/day), and magnesium (100 mg/day) on mood and perceived stress (134)