For years, the Food and Drug Administration has been trying to crack down on the space, sending warning letters to clinics that promote the products and adding more than two dozen peptides to a list of ingredients that should not be made by specialty pharmacies that often custom mix the formulations
N.LoveJ.et al (2012)
Their effects on metabolism, insulin sensitivity, and cellular growth require close monitoring and responsible use
Early pharmacokinetic studies suggested that when standard, unprotected glutathione was ingested, it was rapidly cleaved into its constituent amino acids (glutamate, cysteine, and glycine) by digestive enzymes like $\gamma$-glutamyltransferase and harsh stomach acids
Niacinamide strengthens the skin barrier, controls excess oil, and fades acne scars, while vitamin C brightens dull skin and lessens sun-induced pigmentation
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