Digestive system microenvironment MNMs face several obstacles in the stomach, primarily due to the gastric acid barrier and pepsin
[5] While copper can potentially cause skin irritation or toxicity, in vitro studies suggest that GHK-Cu complexes may have a lower likelihood of inducing these effects
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According to the agency, injectable glutathione for skin lightening carries risks of toxic effects on the thyroid, liver, kidneys, and nervous system, Steven Johnson Syndrome and Toxic Epidermal Necrolysis, along with long-term skin cancer risk