Hahaha, are you bargaining? Bargain in the rate, color, food quantity, gym subscriptions are fine but bargaining on medicine dose due to the hectic schedule may be problematic? Or, if you are unaware of vitamin B12 injections then this question is fine. These doses are fixed and should not be taken on a daily basis. All the doses in one go. Vitamin B12 is a water-soluble vitamin and if you take it on daily basis then it will excrete through urine if not absorbed properly. Toxicity with Vitamin B12 is very rare.