Why a B12 Deficiency Can Make You Feel Like Youre Dying If you have a vitamin B12 deficiencya total vitamin B12 level under 220 pg/mLthe symptoms can come on slowly or quickly, and include headaches, weakness, depression, weight loss, fatigue, pain, inflammation, and more
How vitamin B12 works in the body Vitamin B12 works differently than other vitamins, in that a substance called intrinsic factor must be present in the intestinal tract in order for the body to absorb B12
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[6] In all cases, a healthcare provider should evaluate patient history for any contraindication before initiating therapy
However, please check with your doctor if you are on other medications
(7) A single elevated reading after a supplement or an injection rarely means the same thing as a value that is still elevated on a repeat test weeks later