QuestD 1000 IU Vitamin D3 Supplement Tablets provide 1000 IU of vitamin D per tablet, supporting bone, muscle, and immune health. Vitamin D plays a crucial role in the proper functioning of the immune system, muscles, and the utilization of calcium in the body, which helps maintain strong bones and teeth. Since vitamin D is naturally produced by the body through sunlight exposure, it is often recommended as a supplement for individuals with limited sun exposure. It is especially beneficial for high-risk groups such as those of Asian and Afro-Caribbean descent, pregnant and breastfeeding women, children, and the elderly. Additionally, this vitamin D supplement is dairy-free, gluten-free, and nut-free.