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However, these clinical trials were conducted in Croatia and published in the early 2000s

[10] [11] Intranasal delivery is favored partly because it exploits nose-to-brain transport pathways that may allow a fraction of the peptide to reach the central nervous system while bypassing some first-pass degradation, and pharmacokinetic work in rats has specifically characterized Semax penetration into brain and blood after intranasal administration

None of that is assessed at a gym, so the framing peptides personal trainer safe cannot be evaluated against the relevant clinical criteria