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Vitamin B12 has a very low risk of toxicity, so there's really no upper limit to how much you can take without harm
[20] [21] In the synthesis of creatine, a high-energy molecule believed to enhance exercise, SAM serves as a methyl donor
In contrast, a B12 injection (typically administered into a muscle, known as an intramuscular injection) bypasses the entire digestive system
People who undergo gastric bypass surgery are also often B12 deficient
Why B12 Supplements May Affect Your Bowels When gastrointestinal symptoms occur with B12 supplementation, several factors may be responsible
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