b12 methylcobalamin 1000 mcg injection 1000mcg Mecovon at ₹ 99/piece | Bagadganj | Nagpur made form of vitamin B12 Out of Stock - VITAMIN
Description
Many researchers find their optimal response at 5-10mg weekly

One such study in 2012, published in the journal Obesity, found that obese individuals who received vitamin B12 injections lost an average of 3 pounds more than a placebo group over 12 weeks

Health conditions require unique vitamin B12 supplement plans

I believe its the injection that caused it as I never experienced anything like
