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Triathlon Magazine: Because of vitamin B12s influence on red blood cells and oxygen transport in the body, it plays a vital role in a triathletes energy levels, health, training and performance

If you suspect sensitivity to a particular B12 preparation, discuss switching formulations with your GP or pharmacist

Research shows that around 50 percent to 60 percent of ingested vitamin B12 is usually absorbed when enough intrinsic factor is present in relation to B12, but absorption decreases drastically when this ratio changes

however, it is too small and not appropriately designed to provide definitive answers, Dr Guymer said