Nutrition Diagnostics Formula 3 is a natural source of Vitamins A and D, derived from high-quality fish liver oil. These fat-soluble vitamins play essential roles in maintaining immune function, eye health, skin integrity, and bone mineralisation. Vitamin A supports the maintenance of healthy epithelial tissues (such as the skin and mucous membranes) and contributes to normal vision and immune response. Vitamin D helps with calcium absorption, supporting bone strength and neuromuscular function. This formula is particularly useful for individuals with low sun exposure or dietary intake of vitamin-rich animal products. The fish liver oil is sustainably sourced and rigorously tested to ensure purity and potency. Formula 3 is typically used as part of the Nutrition Diagnostics foundational health protocol, in conjunction with Formulas 1 and 2.