how often can i give myself a b12 injection Should You Get Vitamin Injections? The Timing of B12 Injections:

This is crucial for multi-use vials

Prescription and Pharmacy Fees If a prescription for Vitamin B12 is necessary and filled at an outside pharmacy, there may be an additional dispensing fee charged by the pharmacy

Life threatening vitamin B12 deficiency: will timely screening make a difference?. World journal of gastroenterology 6.3 (2000): 456

It can be a little uncomfortable given that it is a soluable solution being injected into muscle meaning you will slightly be able to feel it once pressure is applied to the injection to administer the B12 solution

BSTAC WS - Anticoccidial Powder COMPOSITION Each 100 gram contains : Amprolium Hydrochloride 17.5 g Sulfaquinoxaline 17.5 g Vitamin A1 retinol acetate 1,500,000 I.U Vitamin K3 500 mg Excipients q.s