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B12 is non-toxic at any dosage and does not have any negative side effects
If you experience unexpected symptoms whilst taking B12, discuss with your GP whether continued supplementation is necessary or whether dose adjustment might help
Most evidence comes from rodent studies and user reports , not large clinical trials
Every batch is third-party tested at 99% purity by HPLC, with mass spectrometry identity confirmation and LAL endotoxin testing
The key difference may be that endurance athletes more acutely feel the effects of suboptimal B12 levels during long training sessions
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