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It is simple, and it can settle your gut fast
Excess B12 from oral supplements is poorly absorbed at high doses (the body absorbs roughly 1 to 2% of a 1,000 mcg oral dose) and the remainder is excreted in urine
By Manuel Bowman Fact-checked by Payton Olsen Last updated June 2026
If you're taking two peptides and feeling better, you can't tell which one is doing the work
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B12 MIC injections and IV treatments bypass the stomach altogether, and are already in a form your body can use, so absorption is not an issue
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