Vitamin D. Dietary source is only required when sun and skin are dissociated by clouds, buildings, and clothes. Since plant foods have negligible quantities of Vitamin D, either sun exposure or supplementation is required to achieve adequate levels of Vitamin D activity in the body. Hypoallergenic diets typically exclude milk and other foods supplemented with Vitamin D and must be deliberately replaced in tablet or oil form, especially in the winter. Milk often contains added Vitamin D in the range of 30 IU per ml. Increased Vitamin D activity increases blood calcium level and increased kidney excretion may produce stones.
Calcification tends to occur in the wrong tissues, with accelerated calcification of arteries.
Kidney damage may occur. Symptoms of Vitamin D overdose include weakness, fatigue, loss of appetite, nausea, vomiting, bone pain, and heart rhythm irregularities.