Formulation choices vehicle, pH, penetration enhancers, concentration, and whether the peptide is stabilized against degradation can make the difference between a product that delivers an active dose and one that mostly sits on the surface
Published formulations typically describe concentrations of 0.1-0.3% for scalp use
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ARYA Atherosclerosis Journal, 18 (4), 18
This allows glutathione to very easily accept and give away electrons
White blood cells, especially T-cells and macrophages, use glutathione to communicate, kill pathogens, and clean up cellular debris