The negative outcomes are not in those short summaries but the are easy to find. However just as a few positve studies don't prove Vitamin D is good for you a few negative studies don't prove it is bad. However negative studies do add to balance of evidence against use.
There is also the risk of overdose in any widely used supplement. Thankfully few of the 60,000 cases of vitamin toxicity in the US annually are Vitamin D (Iron is the riskyist).
A short walk in the sunlight is the best source of Vitamin D because your body naturally regulates it's production to near the optimum amount! I often wonder if the extreme avoidance of sunlight by some people is actually unhealthy...
There is also the risk of overdose in any widely used supplement. Thankfully few of the 60,000 cases of vitamin toxicity in the US annually are Vitamin D (Iron is the riskyist).
A short walk in the sunlight is the best source of Vitamin D because your body naturally regulates it's production to near the optimum amount! I often wonder if the extreme avoidance of sunlight by some people is actually unhealthy...
Cancer: http://www.medpagetoday.com/PrimaryCare/GeneralPrimaryCare/3...
Heart Disease: http://www.ncbi.nlm.nih.gov/pubmed/21505219 http://www.news-medical.net/news/20111117/Vitamin-D-and-its-...