Thorne’s D-5‚000 contains 5‚000 IU of high-quality vitamin D3 and is NSF Certified for Sport®. Although it is well known that direct sunlight is a natural source of vitamin D‚ many individuals‚ especially the elderly‚ don’t get enough vitamin D from sunlight or from their diet. Be sure you get the vitamin D your body needs with Thorne’s easily absorbed Vitamin D-5‚000.