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Injections can cause minor effects such as irritation or itching at the injection site, and the consumer fact sheet is a good plain-language reference on what B12 does and does not do
When youre vitamin B12 deficient, it can lead to various symptoms including fatigue, weakness, shortness of breath, heart palpitations, and more
Your diet, workout routine and other health conditions can affect your risk
Annual Review of Biochemistry
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