Os-Cal

Os-Cal is a prominent brand of calcium supplements primarily used for the prevention and treatment of osteoporosis and calcium deficiency. Developed originally by Marion Laboratories in 1949, the product line features high-quality calcium carbonate formulations often combined with Vitamin D3 to optimize absorption and bone mineralization. The brand has a complex corporate history, having been managed by Marion Merrell Dow, Hoechst Marion Roussel, and Sanofi-Aventis. In 2011, GlaxoSmithKline (GSK) acquired the brand from Sanofi as part of a strategic expansion of its consumer healthcare portfolio. Following the 2022 demerger of GSK's consumer health division, Os-Cal became a key asset of Haleon, an independent, publicly traded company. The brand remains a leading choice in the nutraceutical market, offering various formulations such as Os-Cal 500+D3 and Os-Cal Extra D3 to support long-term skeletal health.