The gradation marks on most insulin syringes make this tricky to hit precisely
VITAMIN B12 is an essential B Complex vitamin, vitally involved in many critical metabolic processes related to coenzymes for tissue formation, DNA synthesis, complete utilisation of carbohydrates and proteins for nervous tissue maintenance and energy production, and blood counts
"Association between vitamin deficiency and metabolic disorders related to obesity"
Yes - the reasons for stinging are usually either swabbed area not dry, a drop of B12 at the tip of the needle (flick syringe and wait a moment) or B12 ampoule not warmed up just before injecting (especially if using fridge)
Still, the comparison is instructive
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