Vitamin D3 1,000 IU

Dietary Supplement Bone & Immune Support Gluten-Free Research suggests that vitamin D may be your single most important supplemental nutrient. Required for optimal calcium absorption, vitamin D promotes strong bones and is a vital support for a healthy immune system. Vitamin D is obtained from the diet or from sun exposure. However, vitamin D is not abundant in foods and people are increasingly avoiding the sun. For many people, supplementation is necessary to ensure healthy levels.