An expert-formulated combination of immune-supporting ingredients Provides comprehensive immune system defense Contains 1, mg vitamin C and 5, IU (125 mcg) of vitamin D Gluten Free Per GMP guidelines, most products are formulated for 24 months from the date of manufacture. Liquids and probiotics are formulated for 12 months. Face seasonal challenges head-on with Swanson Ultimate Immune Defense, a 4-in-1 combo of trusted immune health-supporting nutrients. Ultimate Immune Defense features heaping helpings of vitamins C and D along with zinc and elderberry to cover all your bases for immune health. Vitamin C defends against free radicals and supports immune cell function. While most often thought of for supporting strong, healthy bones, vitamin D is a multitasker that also primes your immune system so it's ready to fight. Zinc--delivered here in the body-preferred picolinate form--is critical for the development and function of the cells that make up your immune system. Loaded with antioxidants and vitamins, elderberry has a long history of traditional use in support of immune health. Together they offer potent support for immune health so you're ready to take on whatever the season brings. Get more tips on supporting a healthy immune system or learn what our health experts take to keep their immune health going strong.