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That gives it sweet taste but those can can definitely cause digestive issue for some people
For those with confirmed deficiency, B12 injections (hydroxocobalamin or methylcobalamin) deliver the vitamin directly into your bloodstream, ensuring full absorption
Some medications also reduce B12 absorption (Sobczyska-Malefora et al., 2021) among the main ones are: metformin, proton pump inhibitors (PPIs), such as omeprazole, lansoprazole and esomeprazole, and H2-receptor antagonists, such as ranitidine, cimetidine, famotidine and nizatidine
If this is the case in your letter, please ask them to provide you with this evidence