Cold comforts? Enerex Reishi Defense is an exclusive blend of immune supporting ingredients including Reishi Mushroom, Vitamins D3 and C, and Citrus Bioflavonoids to provide a powerful boost for added protection and support. Reduce your risks and recover faster with these nutrients that strengthen your immune system to combat harmful bacteria and invading viruses, such as during cold and flu season. They also offer antioxidant support to fight free radicals that contribute to disease and premature aging. Remember, your best defense is a good offense.