Bluebonnet Nutrition - Liquid Vitamin D3 Drops Natural Citrus Flavor 1000 IU - 1 oz. (30 ml) Bluebonnet Nutritions Liquid Vitamin D3 Drops 1000 IU provide natural vitamin D3 (cholecalciferol) from lanolin. Each drop of this sunshine vitamin is flavored using a hint of orange and lemon essential oil