Long-term (3+ years) supplementation of vitamin D significantly decreases all-cause mortality [1]. So yeah, take the supps if you don't get enough sunlight. But personally I am convinced that sunlight exposure, and additional near-infrared "supplementation" are preferable. Nitric oxide release is a double whammy because it reduces stress within cells, and promotes endothelial health (as mentioned in the article).

1: https://www.ncbi.nlm.nih.gov/pubmed/24349197