The best way to increase your glutathione levels is by eating glutathione rich foods
If you are reading about copper peptide side effects, the concern applies almost exclusively to injectable use
Glutathione supports healthy aging, stress responses, immune system, liver health, lung health, physical activity, and detoxification Free Radical Defense: Glutathione is a master antioxidant that supports the body's healthy response to oxidative stress and free radicals, and may help support detoxification pathways Promote Internal Health: Suitable for vegans and vegetarians, Optimal Glutathione Plus may support healthy respiratory and immune systems and a healthy liver
Very large individuals (over 100kg) might tolerate the higher end
If you miss a full week, do not double the dose to compensate
For skin , GHK-Cu has solid evidence for collagen and repair