Too much vitamin D can also lead to health consequences. However, there is no need to worry about an overdose of vitamin D due to exposure to the sun or the diet. In the case of additional supplementation of vitamin D, however, you should speak to the doctor beforehand to avoid possible health consequences. These would be e.g. Vomiting, nausea, feeling weak, headache, nervousness or, in the worst case, an overdose can even lead to kidney stones and damage.