This listing is for (1) Bottle. BioTech Pharmacal D3-50 50000 IU is natural cholecalciferol. Vitamin D functions as a hormone, a chemical messenger with widespread effects in the human body. It is important for optimal bone, cardiovascular, neuromuscular and immune health. Adequate calcium and vitamin D throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis. Supplementation with vitamin D may be necessary to meet daily needs, since obtaining sufficient vitamin D from natural food sources and sun exposure alone can be difficult. Research shows that vitamin D3 (cholecalciferol) is approximately 87% more potent than vitamin D2 for raising and maintaining vitamin D blood levels. A cholecalciferol formula 50,000 IU (12,500% DV) vitamin D3 per capsule Seeks to provide support for normal bone growth and health Seeks to provide cardiovascular, immune and neuromuscular support Free of nuts, gluten and several other allergens Halal certified 100 capsules Dry, water-soluble preparation of natural vitamin D3 (cholecalciferol). More potent than vitamin D2 for raising vitamin D blood levels.