Long term prescription of medications such as the following are likely to increase the cause of, or exacerbate the risk of B12 deficiency - the proton pump inhibitors (esomeprazole, lansoprazole, omeprazole, pantoprazole, rabeprazole), famotidine, ranitidine, metformin, glibenclamide, gliclazide, glimepiride, glipizide, sodium valproate, gabapentin, doxycycline, some oral contraceptives
For example, this is common among people who follow a vegan diet
That distinction carries three practical caveats worth stating plainly: Dose translation is not one-to-one
For individuals without absorption issues, Lifeline Primary Care usually suggests oral B12 supplements or sublingual preparations
The TB-500 component thymosin -4 is prohibited at all times under section S2 of the WADA Prohibited List (peptide hormones, growth factors, related substances and mimetics), which expressly names thymosin--4 and its derivatives