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Patients on Specific Medications: Certain medications, like proton pump inhibitors or metformin, can interfere with B12 absorption, making monitoring and supplementation necessary
Some genetic changes, like in the MTHFR gene, can affect how Vitamin B12 is used in the body
USP notes that its reference standards are intended for test and assay applications, not direct-use contexts, which illustrates the broader distinction between analytical materials and end-use products [9]
Meat, fish, and dairy products all naturally contain B12
We suggest starting with a 1,000 mcg dose given weekly
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