The following three studies suggest that vitamin D supplementation may be beneficial in reducing abdominal visceral adipose tissue in overweight and obese adults.
Studies
1. Calcium and vitamin D supplementation is associated with decreased abdominal visceral adipose tissue in overweight and obese adults. The American Journal of Clinical Nutrition. 2012;95(1):101-108. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3238453/
2. A 12-week double-blind randomized clinical trial of vitamin D3 supplementation on body fat mass in healthy overweight and obese women. Nutrition Journal. 2012;11:78. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3514135/
3. Impact of vitamin D supplementation during a resistance training intervention on body composition, muscle function, and glucose tolerance in overweight and obese adults. Clinical nutrition (Edinburgh, Scotland). 2013;32(3):375-381.
A recent article from the AAFP showed that Vitamin D supplementation was ineffective for a lot of other conditions.
https://www.aafp.org/afp/2018/0215/p254.html
