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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

Some patients need less than 30% Humulin R and more Humulin N, so these combinations of insulins cannot be used

Below are B12 deficiency signs you can look out for

Supplements give a lot of B12, but whole foods have more nutrients

The area around the belly button has different tissue composition and blood flow, which can affect absorption and increase bruising risk