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Key Challenges in Glutathione Conjugation Projects Unclear Site Selectivity Glutathione contains a highly reactive cysteine thiol together with terminal amino and carboxyl functions, so route selection matters
Because of their relatively low purity levels and attendant immunogenetic risk, theyre relegated to laboratory use only.24 Selank is not FDA-approved, and pharmaceutical-grade versions are hard to come by in the United States, so most of what youll find (usually online, through vendors without validated reputations) is research-grade
R.KhorT
They are not competitors, they operate on different layers of skin health
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