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As B12 is a water-soluble vitamin, it's generally considered safe (because any not used will be excreted via your urine), but even so you shouldn't take more than the recommended doses unless recommended to do so by your GP, as some studies have shown possible negative impacts of overdoing it
Cyanocobalamin should not be used in patients with early hereditary optic nerve atrophy (Lebers disease)
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Performance optimization Improving energy production and recovery capacity
Bottom line is, neither the benefits nor the risks of the vast majority of these peptides have been scientifically proven in humans
