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GHK-Cu targets these cells directly

It makes sense for both researchers and supplement companies to focus on NMN and NR, as the salvage pathway is responsible for so much NAD+ production

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This is highly speculative because: Oral bioavailability differs between species Route of administration affects systemic exposure Species differences in peptide metabolism and clearance are unknown Current Practice Patterns Current practice patterns from unregulated sources typically involve: Subcutaneous injection: 0.25-0.5 mg once or twice daily, administered near injection sites for localized effects or abdominally for systemic distribution