Scenario 3: Contaminated solution from skipping sterile technique
Where they overlap and where they don't Complementary Mechanism Targets Target Origin BPC-157 Gastric juice protein fragment (15 amino acids) TB-500 Thymosin Beta-4 fragment (LKKTETQ region) Target Primary action BPC-157 Local tissue repair signaling TB-500 Systemic cell migration and mobilization Target Angiogenesis BPC-157 VEGF upregulation, NO pathway TB-500 Endothelial migration, VEGF crosstalk Target Cell migration BPC-157 Indirect, via growth factors TB-500 Direct (G-actin sequestering) Target Best-evidence tissue BPC-157 Tendon, gut, gastric mucosa (preclinical) TB-500 Cardiac, corneal, skin (preclinical + early human T4) Target Reported in vivo half-life BPC-157 ~4 hours (animal estimates) TB-500 ~23 days (animal estimates) Half-life figures are pharmacokinetic estimates from animal studies

In fact, the absorption of B12 requires that you have adequate stomach acid (among many other factors), which means that if you are taking acid blockers for reflux you are likely reducing your absorption of B12
B Vitamins: Support energy metabolism, provide stress support, improve cognitive function and mood
Many talks exist surrounding B12 injection, one of which is that Vitamin B12 injections can affect your weight and cause inflammation