vitamin b12 injection serum available in us Compounded Hydroxocobalamin (Vitamin B12) 12 solution to be administered through injection only Intended for use in cattle Vitamin B-12 Injectable Solution

Its unclear whether they should be used together

Working with Peptide Solutions When preparing a peptide solution, use a high-purity solvent, such as sterile, deionized water or an appropriate buffer

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That is why it is important to measure both B12 and MMA at the same time, as an elevated MMA can indicate B12 deficiency even if the B12 is normal. When the levels come back, ask to see them yourself and ask questions of your doctor if there is any question of normal B12 metabolism. In my case, my B12 levels were very low and my MMA levels were very high, indicating B12 deficiency