Vitamin D3 provides our body with incredible opportunity to grow stronger and increase power in our muscle in addition to training. Leaner, muscles supported by a stronger skeleton is a win/win for our overall health and mood. Besides helping us feel and look good, Vitamin D3 provides our immune system a positive response by producing a series of compounds named antimicrobial peptides that kill infectious organisms. Vitamin D3 also keeps our immune system in greater balance which provides us with an easier time fighting common colds and flu’s.