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B12 levels increased significantly more for pregnant than non-pregnant women when given an oral dose of 1,000 g (respective increase of 195 vs 117 pmol/l) or 500 g (respective increase of 147 vs 95 pmol/l), but not for 250 g (respective increase of 11 vs

Published evidence is summarized lower on the page

Intrinsic Factor replacement therapy can cause side effects such as: Pain or swelling at the injection site Allergic reactions to the synthetic intrinsic factor The adverse effects may be transient in some situations and get better with time, but they may also be severe in other circumstances and need medical treatment

If the test result is high, the answer is no , which we call a negative test

A Closer Look at B12 Injections for Weight Loss How Do B12 Injections Work for Weight Loss