This is especially important for patients with absorption issues such as those with digestive conditions, low stomach acid (common with aging), or MTHFR gene variants who cannot adequately absorb B12 from food or oral supplements
There is considerable literature about the oddities of the prescribing habits of British doctors , the factors influencing them, and the attitudes of doctors to prescription, but there have been as far as we know, no attempts to compare quantitatively the expected amount prescribed, on the basis of good clinical practice, with that actually prescribed
B12 oral spray vs shot compared by absorption, cost, and convenience
For example, a nominal 10 mg vial may contain slightly more or slightly less than its labelled quantity
Use the batch verification tool with the lot number printed on the vial label, or browse current lots in the Research Vault when certificates are published
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