Vitamin D is a fat-soluble vitamin produced naturally in the skin in response to sunlight. Vitamin D3 supports a healthy immune system and enhances the absorption of calcium, which promotes strong teeth and bones. Supplementing with Vitamin D3 is an easy way to ensure you’re getting Vitamin D3 every day. Keep your body running optimally by supplementing with Vitamin D3, shown to support strong teeth and bones and strengthen the immune system. VITAMIN D3 is for both men and women.