What happens if you have abnormal vitamin D levels?

Low Vitamin D

Low vitamin D levels can lead to various effects, including thin and brittle bones. Vitamin D deficiency can lead to abnormally shaped bones for people still developing. In older adults, low vitamin D levels may contribute to osteoporosis development. 

Too Much Vitamin D

In rare instances, a person can develop toxic levels of vitamin D over time if they supplement with too much vitamin D. When this happens, you can have too much calcium in your bloodstream and experience side effects like nausea, weakness, vomiting, kidney stones, and bladder irritability.