Vitamin d deficiency has been highlighted as a national issue across all age groups vitamin d is known as the sunshine vitamin as uv rays in the sunlight act on our skin to produce vitamin d due to the longitudinal position of ireland resulting in poor sun exposure and the lack of dietary sources of vitamin d, it is difficult to source this vitamin without supplementation vitamin d is important for the maintenance of bones and teeth, normal muscle function, neurotransmission, and cell division vitamin d is also important for the absorption and utilisation of calcium and phosphorus, the maintenance of normal blood calcium concentrations, the normal function of the immune system and inflammatory response