b12 injection half life How Long Does Vitamin Last In Your System (The National Institutes of Health) Aging can make it more difficult for the body to break down and absorb B12 Vitamin B12 - Wikipedia

Thiamine hydrochloride (vitamin B1) in the formulation is known to cause life threatening anaphylaxis especially on multiple administrations if patient is allergic to it

Phentermine is a clinician-guided appetite support option designed to help reduce hunger and support portion control as part of a medically supervised weight management plan

If you develop diarrhoea after starting B12 supplementation, it is worth considering other factors that may be contributing to your symptoms

Laboratory models of bone fractures, nerve injury, and lung tissue damage have been used to study its systemic or local effects on repair processes