Supplementation without recommendation.

Vitamin D deficiency is very common, more so with the present lifestyle scenario where most people seem to get very little sunlight. Hence supplementation is a necessity for a vast majority of individuals. However, the dosage & duration can only be determined by a qualified professional based on a blood report not just of the said Vitamin but also numerous other factors. Randomly prescribing or consuming supplements can result in serious side effects. 

https://www.ctvnews.ca/health/vitamin-d-overconsumption-leaves-man-with-permanent-kidney-damage-1.4370261?fbclid=IwAR1H_BvfXFN8s_VEWKH_7SpyXgxV7JoSW1DYsCXDYKXMT74vxaFHeHuHmrE