Calcium & Magnesium Algae Mineral Complex is an all-natural wholefood source of plant-based calcium and magnesium. Formulated to deliver an optimal 2:1 ratio of calcium to magnesium in meaningful doses, this advanced bone support supplement provides the most important minerals and vitamins for long-term musculoskeletal health. Boosted with vital co-factors vitamins D3 and K2 and boron, which work in synergy to support optimal absorption, metabolism and utilization of calcium and magnesium. Derived from algae and mineral-rich seawater, Aquamin® mineral complex also contains naturally-occurring trace minerals, including selenium and zinc.