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Some research suggests that athletes with poor or marginal nutritional status for vitamin B12 may have decreased ability to perform high intensity exercise
If you want to verify the efficiency, you can yourself do a clinical study, and prove RFK is wrong
In that case, a persistently high level can signal severe disease, including liver and kidney conditions and some types of tumors
doi:10.1159/000053183 Heffernan M, Summers RJ, Thorburn A, et al
These compounds may offer additional potential benefits and support in various research applications
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