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If you're 50 or over, your doctor may recommend a B12 shot after a significant blood test

For ongoing care, especially if you have a chronic condition causing the deficiency, you might need maintenance shots, maybe every two months or even monthly

Thus, dietary supplement B 12 supplementation at 500 to 1000 g per day allows pernicious anemia and certain other defects in B 12 absorption to be treated with daily oral megadoses of B 12 without any correction of the underlying absorption defects

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The FSA (Food Standards Agency) relies on the fact that producers are likely to want to safeguard their reputation

However, B12 injections may have higher absorption rates, making them more effective for individuals with absorption issues or severe deficiencies