Brand from United States: Nature's Way. DESCRIPTION: Plant source calcium & vitamin C with vitamin D3, vitamin K2, magnesium & synergistic minerals. It is derived from Lithothamnion (calcified red algae seaweed sustainably harvested from pristine Icelandic waters), kale, spinach & collard greens. Easy to digest & Utilize While many calcium supplements are sourced from limestone rock or animal bones, Alive! Calcium provides calcium & trace minerals that may be easier for the body to digest, absorb & utilize. Promote Healthy Bones Adequate calcium intake throughout life, as part of a well-balanced diet & regular exercise, may reduce the risk of osteoporosis. Alive! Plant Source Calcium provides 1, 000 mg of calcium per serving (100% DV), vitamin C, vitamin D3, vitamin K2, magnesium & supportive minerals. -Max Absorption: Vitamin D3 enhances calcium absorption & utilization. -Bone Density: Magnesium & vitamin C help maintain bone density. -Vitamin K2 (MK-7) directs calcium to the bones where it s needed most. -Additional Minerals: Boron & strontium assist calcium in promoting healthy bones. Directions: Take 4 tablets daily, preferably with food. For best results, take 2 tablets twice daily with food. Do not exceed recommended dose.