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Symptoms of severe vitamin B12 deficiency can include visual disturbances, severe joint pain, paresthesia (tingling in the hands and feet), memory problems, depression, anxiety, poor muscle function, ataxia (impaired balance and coordination), changes in reflexes and even infertility
This emphasizes the significant role of vitamin B12 in DNA synthesis, myelin sheath maintenance, and cell metabolism, underscoring its essential contribution to promoting good health
Marnela et al., 1985)
Injections can also cause pain, swelling, or redness at the injection site
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