Although Vitamin D does play multiple roles in supporting bone health, muscle function, and nerve and joint health as well as regulating the absorption and utilization of calcium and phosphorus, it does has its own disadvantages too. In fact, all these tasks performed by Vitamin D are not possible if without the help of other molecules such as Vitamins A and C, including even the help of sunlight as well.
Vitamin D may be useful in many instances such as in the treatment of rickets and osteomalacia. However, to begin with, Vitamin D needs the help of other molecules in order to be activated and be readily absorbed into the bloodstream before it can carry out its tasks in regulating the absorption and utilization of calcium and phosphorus, for example. Moreover, even if Vitamin D levels are high but if they are not properly metabolised to be used for biological processes, their build up in the liver can actually cause toxicity and result in pathological changes in the body.
As such, Vitamin D toxicity can result in excessive calcification of bone, kidney stones, calcification of soft tissue, headaches, weakness, nausea, vomiting, constipation, polyuria, and polydipsia, all of which have effects which may be detrimental to an individual. Therefore, in order for Vitamin D to be properly utilized in the human body, other molecules such as Vitamin A and C, choline, unsaturated fatty acids, and phosphorus must be present as they too, play an important role in assisting the absorption of Vitamin D.
No doubt, sunlight also plays a huge role in aiding the absorption of Vitamin D too. Hence, as to whether Vitamin D can be described as a marvellous molecule, I beg to differ on this given the reasons stated above, that if without the help of other essential molecules, the usefulness of Vitamin D itself is greatly inhibited.