It would take randomized, placebo-controlled trials in humans, ideally several, run in more than one country and by groups without a financial stake in the answer, measuring a pre-specified cognitive outcome rather than a grab-bag of secondary ones
The peptide does not appear to bind a single dedicated receptor
Legitimate online peptide purveyors will deal exclusively in products labeled pharmaceutical-grade or GMP API, which indicates FDA approval for human use
Both NAD+ and Glutathione have unique benefits, but for those looking for a well-rounded approach to detoxification, immune support, and cellular protection, Glutathione is often a preferred choice
This is the second large and under-discussed divergence between the DSIP literature and contemporary practice, and it compounds the dose gap described above