Synergy Vitamin D3 drops are specially formulated for infants (0-3 years). Each ml provides 400 IU of cholecalciferol (Vitamin D3). These drops are an easy way to provide optimal levels of Vitamin D3 for your little one's development. Powered by DHA, a fatty acid that promotes healthy brain and eye development, you can be sure your baby is receiving the right nutrients for a head start.