USA Ddrops Booster 600 IU (100 drops) Ddrops? Booster 600 IU liquid vitamin D3 supplement for children and adults that provides the National Academy of Medicine's Recommended Dietary Allowance (RDA) for vitamin D dosage for people from 1 year to 70 years of age. Ddrops? Booster can be taken in addition to a multivitamin that contains a small amount of vitamin D, and can provide an added boost of vitamin D. The National Academy of Medicinerecommends that all children receive a daily vitamin D supplement of 600 IU. Ddrops? Booster is not intended for use in infants under the age of 12 months, unless otherwise directed by your healthcare practitioner.