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However, for people with normal B12 levels, there is no scientific evidence that taking extra B12 will boost energy, enhance athletic performance, or promote weight loss
Oral supplements face challenges in the digestive system, where absorption can be low, mainly in those with certain gut issues
For other patients, an injection every three to four months may suffice
They had never actually met with a provider, and they received zero counseling on side effects, lifestyle, or nutrition
If one causes intolerable side effects, trying the other is reasonable
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