A recent study found that women with the highest levels of Vitamin D were almost 60% less likely to develop macular degeneration. The working theory is that Vitamin D has anti-inflammatory properties that can help prevent the damage that leads to macular degeneration.
However, it is recommended that people get their Vitamin D levels checked first to see if they need to take supplements, as some people may get enough from their diet. Since Vitamin D is a fat soluble vitamin, excess amounts that are ingested are stored in the body rather than excreted which can lead to Hypervitaminosis D.
Hypervitaminosis D can lead to increased levels of calcium in the blood, which in turn increases absorption of calcium in the intestinal tract, large deposits of phosphate and calcium in organs such as the lungs, heart and kidneys, which can cause irreversible organ damage, high blood pressure, heart arrhythmia, increased risk of heart disease, kidney stones, and renal failure.