Vitabiotics Ultra Vitamin D3 4000IU Tablets are a high-strength daily supplement formulated to support immune function, bone health, muscle performance and overall wellbeing. Each tablet provides 4000IU of vitamin D3, the form naturally produced by the body through sunlight exposure. Vitamin D contributes to the normal function of the immune system, supports calcium absorption and helps maintain healthy bones and teeth. It also contributes to normal muscle function and supports healthy blood calcium levels. The tablets are suitable for adults with increased vitamin D requirements, limited sun exposure or low dietary intake and are intended for use according to the pack directions or healthcare professional advice.