One drop contains your daily dose of 2500IU of vitamin D3 in a base of medium chain triglycerides for enhanced absorption. And, it fits right in your pocket, purse or backpack for on-the-go. We need this vitamin for many different things – calcium absorption, immune function, mood health, skin health, cardiovascular function, hormone balance, and even more. We choose D3 for our vitamin D supplements, because it’s the most natural form of vitamin D, and it’s easily absorbed in the body.