Magnesium oxide capsules also containing chelated magnesium. BioTech USA Magnesium + Chelate is ideal for those who are looking for organic bound magnesium, which can be utilised easily but the human body. Magnesium contributes to a reduction of tiredness and fatigue as well as to normal functioning of the nervous system and to the maintenance of the electrolyte balance. Magnesium participates in normal energy yielding metabolism.