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The key difference comes down to bioavailability, which is how much of a nutrient your body can actually absorb and use
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Esworthy RS et al
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You will not have to worry about getting too much when you receive your B12 injections in Cary
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Individuals with a faster metabolic rate may burn through their B12 reserves more quickly, while those with a slower metabolism might retain the vitamin for a longer period
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