Dietary Supplement 10 mcg (400 IU) 500 Drops Per Bottle in a Base of MCT Oil Isura - Non -GMO - Documentation - Mass Spec - Lab Tested Purity & Potency Guaranteed Suitable for Vegetarians Vitamin D3 is essential for strong bones and teeth as it increases the body's absorption of calcium from food. Its role in regulating calcium levels also helps regulate the immune system and maintain healthy nerves and muscles. Vitamin D3 is a potent liquid supplement that is carefully blended in a mixture of medium chain triglycerides (sourced from certified sustainable palm and coconut oil) and flaxseed oils providing 10 mcg (400 IU) of vitamin D3 in just one little drop. Manufactured by Natural Factors to ensure safety and potency in accordance with Good Manufacturing Practices (GMP) of the FDA and Health Canada.