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Description
You may also have a higher risk of developing a vitamin B12 deficiency if: If youre experiencing any of the following symptoms, you may have a vitamin B12 deficiency

Listed on the WADA Prohibited List
Patients should follow directions for dose, injection route, needle handling, storage, and disposal
Are Vegans and Vegetarians at Risk

Oral is the standard

[7] High-dose methionine may antagonize the therapeutic effect of L-dopa-carbidopa regimens by increasing peripheral methylation of the drug complex, potentially reducing central bioavailability
