These days supplementation has become very important as the average person is unable to absorb their daily dose of vitamin through 15-20 minutes unprotected sun exposure. Good Health Naturally’s Vitamin D3 is "The Sunlight Nutrient"! It delivers a significant dose of 5,000 IU's (international units) of Vitamin D3 as well as a 100 mg of calcium from coral per capsule, allowing full absorption in a small dose. This should form part of any overall health regime for optimum health.