MAXI D3 CONCENTRATE - Our Vitamin D3 concentrate is your easy to use liquid source for supplemental Vitamin D. Just one drop contains 1000 IU (25 mcg). Helps support a healthy immune response and aids the absorption of calcium to promote strong bones & teeth. PREVENT VIT D DEFICIENCY - Over a billion people worldwide have a Vitamin D deficiency. Healthcare professionals recommend that adult men & women supplement with Vitamin D3 to prevent deficiency. D3 is the most potent and absorbable form of D vitamins.