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Vasoactive intestinal peptide (VIP) VIP belongs to the glucagon/secretin gene family, with its own VIP gene that transcribes to two prepro-VIP precursors, giving rise to 3 peptides (in humans) VIP, peptide histidine methionine 27 (PHM-27) and peptide histidine methionine 42 (PHV-42) [111]
Consistent data collection makes protocol adjustments more informed and outcomes more meaningful
The science supports itand so do the results
Immunity (2013) 39(2):40012
After 5 sessions: 26.5% median hair regrowth, 93% shedding reduction, zero adverse events (Kuceki et al., 2025)
Similar concerns apply to phosphodiesterase-5 inhibitors (medications like sildenafil) and L-arginine supplements that also influence nitric oxide signaling
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