There are many types of skin anesthetics
22,23 In patients with a normal or low-normal serum vitamin B 12 level, complete blood count results demonstrating macrocytosis, or suspected clinical manifestations, a serum methylmalonic acid level is an appropriate next step 1,2,6,18 and is a more direct measure of vitamin B 12 's physiologic activity
The process is relatively painless, with minimal side effects, such as mild redness or swelling at the injection site
These are the B complex vitamins, including Vitamin B12: Vitamin B1 or thiamine Vitamin B2 or riboflavin Vitamin B3 or niacin or nicotinic acid Vitamin B5 or pantothenic acid Vitamin B6 or pyridoxine, pyridoxal or pyridoxamine Vitamin B7 or biotin Vitamin B9 or folic acid Vitamin B12 or cobalamins such as cyanocobalamin or methyl-cobalamin While all the Vitamin B100 Complex vitamins are chemically different, several can be found together in food sources
Yes, though it is rare