Natural Factors Whole Earth & Sea Bone Structure Multivitamin & Mineral - This formula is made from the highest quality organic ingredients and contains the proper ratios of vitamins, minerals, and nutrients to support bone mineral density, maintain bone health, and reduce the risk of osteoporosis - all sourced from Farm Fresh Factors™ and other whole food sources. One of the most important ingredients in Bone Structure is the algae – a plant-source, whole-food calcium. It provides calcium, naturally occurring magnesium, 70+ trace minerals, and phytonutrients, all in a natural food matrix that may be easier for the body to digest, absorb, and utilize. This organic algae is so body-friendly that 97% of it goes into solution in 30 minutes — proving it is very bio-accessible. You get a full spectrum of minerals and plant nutrients working for you instead of a single element like most calcium supplements provide. Sustainably and whole food sourced, no gluten or GMOs.