Dietary Supplement. The Sunshine Vitamin in Just One Drop. A factor in the maintenance of good health. Liquid Vitamin D3. 1000 IU per Drop. 180 Drops Vitamin D3 is made in skin exposed to summer sunlight , or obtained from a few certain foods eaten or taken as a supplement. Vitamin D is needed in the body to raise blood levels of 25-hydroxyvitamin D D), which are associated with healthy bone, muscle, breast, heart, colon and immune system. Research findings show a 25 D blood level above 30 mg/mL is related to better health and less risk of disease. A vitamin D3 supplement may be especially helpful for anyone who avoids exp.