Because the injection bypasses your digestive system, your body can access the B12 quickly instead of waiting for absorption from food
The changes came in phases, and Marcus tracked them carefully enough to distinguish real signal from wishful attribution
TABLE 2 Pharmacokinetic parameters of BPC157 in rats following intramuscular administrations of doses ranging between 5 and 120 g/kg (mean SD, n = 6)
Galan-Chilet et al
Vairetti, M., Di Pasqua, L
ChEMBL v34 compound record for TIRZEPATIDE (CHEMBL4297839): max_phase 4 (approved), first_approval 2022, parenteral, GIP receptor agonist, first-in-class, black-box warning flag