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Some health issues can change how much B12 is needed
Determining the Right Dose and Schedule The dosage of vitamin B12 injections may vary depending on factors such as sex, age, weight, diet, and other individual factors
That's because the bioavailability of vitamin B12 from dairy - how much of the vitamin is available for your body to use after consuming it - appears to be three times higher
Green R, Allen LH, Bjrke-Monsen AL et al (2017) Vitamin B12 deficiency
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