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Supplements and Injections If your deficiency is caused by an absorption issue (like low stomach acid or pernicious anaemia), eating more B12 might not be enough

The effectiveness may also depend on how far out of date the medicine is

Some side effects that may be seen after injectable B12 are: mild diarrhea itching or rash nausea and vomit headache swelling venous thrombosis pulmonary edema or congestive heart failure allergic reaction or anaphylaxis (rare) Caution : Vitamin B12 in the form of cyanocobalamin (found in most dietary supplements) should be avoided by people with Lebers disease (hereditary optic neuropathy), as it can cause severe atrophy of the optic nerve (10)

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This supports metabolism, recovery, sleep quality, and overall performance without disrupting your natural hormonal balance over time consistently safely