The chemistry that makes both AHK and GHK interesting is copper coordination
Once the needle is in the muscle, the plunger is pulled back slightly to ensure the needle is not in a blood vessel
OHalloran, Daniel Carey, Deirdre OConnor, Rose A
Certain medications The following drugs can reduce levels of vitamin B12 in your body: Antibiotics -- long-term use can lower vitamin B levels generally Anti-seizure drugs Chemotherapy medicines, especially methotrexate Drugs used to reduce stomach acid, like H2 blockers (Pepcid AC, Tagamet, Zantac) and proton pump inhibitors (Nexium, Prevacid, Prilosec) Metformin (Glucophage) -- taken for diabetes Colchicine -- taken for gout Some cholesterol-lowering medications Other causes You're over 65
If you want the underlying logic explained from scratch, see the peptide reconstitution guide, the guide to how much bacteriostatic water to use, and the insulin syringe units guide
Do B12 shots work