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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

Subcutaneous injection No

So it can't be said for certain if his idea was right or wrong

For intramuscular injections in your shoulder youll need a partner to inject you

The benefits of vitamin B12 shots Whenever people find it difficult to maintain adequate vitamin B12 levels, either because they have an absorption problem or follow a vegan or vegetarian diet, B12 supplements often come to their aid