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One study found that lactating women taking 2-60 mg of niacin daily had milk niacin concentrations of 1.17-2.75 g/mL
adults aged 19 and older have a vitamin B12 deficiency, defined as serum levels lower than 200 pg/mL
She has many therapy options even if you're not sick
They can also recommend alternative supplementation methods, such as oral supplements or patches, if injections are not necessary or appropriate for your situation
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As we age, stomach acid production can decline (atrophic gastritis), which makes it harder to extract B12 from food or pills
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