nature doc acetyl glutathione S-Acetyl L-Glutathione 300mg Glutathione NAC for Hair, Skin
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This identified 60 active or recently completed drug trials included in the final review

Topical niacinamide stabilizes the epidermal barrier function with increased protein and ceramide synthesis and keratinocyte differentiation, improving skin microrelief and attenuating fine wrinkles

[DOI] [PubMed] [Google Scholar] 202.Moiseyev G., et al

But no matter how much water you choose to use, you would get ten 0.5mg shots out of your 5 mg vial
