5000IU of the active form of Vitamin D, D3 is recommended by medical professionals and experts for Vitamin D repletion. (Dr. Hollick) Dose adjustable. Safe for children. The active components in Spray Vitamin D3 ACTIVE by SpectraSpray are already ‘dissolved' and just waiting to be absorbed into your system. As an ‘emulsion', the nutrients are fully mixed and ready to spray, giving you the highest absorption available by oral supplementation. The “Sunshine Vitamin” which acts more like a hormone than a vitamin, regulating many cells and organs in your body which have vitamin D receptors (VDR)