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Methylcobalamin and hydroxocobalamin are generally preferred over cyanocobalamin for athletes due to better retention and utilization
Proton pump inhibitors reduce gastric acid production, which impairs the release of food-bound B12 but has less effect on synthetic B12 in supplements
The best choice depends on the cause of deficiency, absorption issues, and your clinicians recommendation
It has been found to improve insulin sensitivity, reduce blood glucose levels, and lower HbA1c levels in people with type 2 diabetes
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