For as long as I have been researching an studying Micronutrients, Vitamin D has always stood out as the most intriguing. Classified technically as a “vitamin’ , this essential nutrient functions more like a hormone on our bodies. Ive written extensively about its effect on Hormone regulation which is vital to training and performance, but new science is out now about its very important effects on immune system regulation. Specifically, Vitamin D buffers the immune response to pathogens, virus’ and bacteria. And the timely research shows, that we need Vitamin D levels to be good in our bodies more than ever.