Sentinel Vitamin D3 1000 IU is a dietary supplement containing 30 softgel capsules. Each softgel provides 1000 IU (25 mcg) of vitamin D3 (cholecalciferol) to support bone health, immune function, and calcium absorption in the body. Vitamin D3 is a fat-soluble vitamin that plays multiple important roles in the body. The 1000 IU dosage is a common maintenance dose suitable for many adults. The softgel format helps with optimal absorption since vitamin D is fat-soluble. The bottle features a tamper-evident seal for product safety and quality assurance. As with any supplement, consult with a healthcare provider before starting use.