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doi: 10.3390/jcm13082176

B Vitamins and the Brain: Mechanisms, Dose and Efficacy - A Review

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This includes people with pernicious anemia, a condition where the body lacks intrinsic factors, making it impossible to absorb B12 from food

To be metabolized, B12 is combined with a particular protein made in your stomach, without which the vitamin wont be absorbed into your body

In our experience working with researchers in this space, the most common dilution error is adding water to reach a 'convenient' syringe marking without calculating concentration first