Signed YAMAMOTO RESEARCH, Vitamin D3 50mcg is a high-dose vitamin D3 (cholecalciferol) supplement, designed to support bone health and the immune system. Vitamin D contributes to the normal absorption and utilization of calcium and phosphorus, to the maintenance of normal bones and teeth, and to normal blood calcium levels, as well as supporting normal muscle function. A particularly useful intake during periods of limited sun exposure, for active adults, athletes, and those who want to preserve skeletal health over time. Gluten-free. Pack of 60 tablets, for continuous use of approximately two months.