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However, a measured oral bioavailability percentage in a living animal has not been published, so orally bioavailable is a reasonable expectation rather than an established fact
IM injections involve the direct administration of vitamin B12 into the muscle tissue, typically in the form of hydroxocobalamin or methylcobalamin
Diagnosis typically includes testing for anti-intrinsic factor antibodies (and sometimes anti-parietal cell antibodies)
This requires either a caloric deficit or high activity levels that create energy demand
Some are made from a mix of B vitamins, minerals, and amino acids
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