Vitabiotics vitamin D3 is a premium dietary supplement designed to help you achieve an adequate level of vitamin D in the body. Vitamin D is one of the only vitamins created in the body, and is synthesised naturally when your skin is exposed to sunlight. During parts of the year where there is less sunlight, however, it is common for people to become deficient in vitamin D. In these instances, supplementation is recommended to keep your vitamin D levels sufficient.