Research shows GHK-Cu's therapeutic dose is approximately 300-fold below its toxic threshold
Like that would ever be appropriate
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Certain factors may put you at increased risk for B12 deficiencyincluding a vegetarian or vegan diet, specific medical conditions (such as Crohns or celiac disease, or a history of gastric surgery), and age over 50
Reported adverse effects of IV glutathione include adverse cutaneous eruptions including potentially fatal Stevens-Johnson syndrome and toxic epidermal necrolysis, severe abdominal pain, thyroid dysfunction, renal dysfunction, and lethal complications such as air embolism or potentially fatal sepsis due to incorrect/unsterile method of IV administration, with side effects on the use of injectable glutathione for skin lightening including toxic effects on the liver, kidneys, and nervous system
Scientists have described that the S-acetyl form of glutathione has high bioavailability