The Energy Supplements High Potency Dietary Supplement Cal 1200 mg/Mag 600 mg/Vit D3 1000 IU Gluten Free Bioavailable D3 Active Form Quality Natural Supplements Purity Guaranteed - Meets Strict Government Safety Standards for Heavy Metals & Toxins Nutritional Support for Healthy Bones, Natural Energy Production and Overall Well-Being. Nature's Plus Cal / Mag / Vit D3 with Vitamin K2 fuses core synergistic essential nutrients for unparalleled bone health support. Biotron-chelated calcium and magnesium work dynamically with the most powerful, most bioavailable forms of vitamin D3 and Vitamin K2. Nature's Plus Cal / Mag / Vit D3 with Vitamin K2 conforms to the strictest standards for purity including California's Proposition 65.