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Headaches One of the most common symptoms of B12 deficiency is headaches
Additionally, elevated levels of the plasma amino acid homocysteine can be a functional marker of folate, vitamin B12, or vitamin B6 deficiency, as all these vitamins are required to convert homocysteine into methionine
This becomes noticeable in most people in their 30s and 40s
While no major safety flags have emerged from either the scientific literature or widespread anecdotal use, the absence of large-scale human data means users should proceed carefullyespecially if considering high doses or long-term use
However, its essential to remember that B12 injections are not a permanent solution for B12 deficiency
