Sentinel Vitamin D3 400 IU is a dietary supplement containing 100 softgel capsules that provide essential vitamin D3 (cholecalciferol) to support bone health, immune function, and calcium absorption. Each softgel delivers a daily dose of 400 IU in an easily absorbable form. The supplement comes in a sealed amber glass bottle to protect the contents and maintain potency. Vitamin D3 is particularly beneficial for individuals with limited sun exposure or those looking to maintain healthy vitamin D levels. The softgel format is designed for optimal absorption since vitamin D3 is fat-soluble. When taken as directed, the 100-count bottle provides a 100-day supply.