Immune Support Night is a proprietary formula of nutrients designed to protect your health. Vitamin D3 is featured to support immune health. This formula also includes Vitamin K2, which with vitamin D3 supports bone health. Ergothioneine ErgoActive® is an antioxidant that fights free radicals and combats oxidative stress. Immune cells are vulnerable to oxidative stress overtime may be detrimental to the immune system. And finally, melatonin helps promote relaxation, by supporting the body's natural chemistry responsible for a restful night's sleep.*