The association of acetaminophen and asthma prevalence and severity
Garolla et al
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
However, glutathione is generally considered safe for most individuals when taken within recommended dosages
L-Glutathione exists in the body in 2 forms that recycle back and forth, a reduced (or "active") form and an oxidized form
Athletes and Active Individuals Runners, CrossFitters, recreational athletes, and fitness enthusiasts seeking faster recovery from injury, reduced downtime after intense training, support for chronic overuse injuries (tendinopathies, muscle tears), and a potential edge in the healing process