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Xiao W, Jiang W, Chen Z, Huang Y, Mao J, Zheng W
More on this: Vegan and vegetarian sources of B12 To diagnose a vitamin B12 deficiency, doctors A doctor may order blood tests if they suspect a person has a vitamin B12 deficiency, including a complete blood count and tests to check levels of B12 and folate in the blood
Serious side effects are rare in research literature
For injectable users, especially those using GHK-Cu long-term, periodic blood work makes sense
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