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For people with a B12 deficiency, injections are often prescribed because they allow for better absorption than oral supplements
Uncommon (affects 110 in 1,000 people): itching, rash, lightheadedness, or joint pain
In the first 2448 hours, some patients experience what is sometimes described as a 'boost' in energy levels or improved mental clarity
Even some meat eaters dont absorb it very well (4, Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called intrinsic factor
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