Dietary Supplement. Builds Strong Bones & Teeth*. May Help Prevent Osteoporosis**. With Vitamin D3 for Optimum Absorption. Compare to OS-Cal® 500+D. Guaranteed 100% Potency This product has been manufactured and packaged in strict conformance with industry and government standards. This Product in compliance with California proposition 65 for safe lead content. USP dissolution tests guarantee that this calcium carbonate product will completely dissolve in 30 minutes. Guaranteed No Added: Sugar, sodium, yeast, wheat, dairy, gluten, egg, fragrance, artificial colors or flavors and preservatives.