Sentinel Vitamin D3 400 IU is a dietary supplement containing 100 softgel capsules that provide vitamin D3 (cholecalciferol). Each softgel delivers 400 IU of vitamin D3 to support bone health, calcium absorption, immune function, and overall wellness. The supplement comes in an amber glass bottle with a tamper-evident seal to ensure product freshness and safety. The softgel format is designed for optimal absorption since vitamin D3 is fat-soluble. This dosage (400 IU) represents a standard daily supplementation amount that can help maintain healthy vitamin D levels, especially for those with limited sun exposure or dietary restrictions.