Solgar Ester-C Plus Immune Complex features scientifically studied immune system supporting nutrients and is designed to help maintain immune system function throughout the year. Its comprehensive formula is made with vitamins A, B6, B12, C, and D3 as well as folate and zinc. It also provides the botanical ingredients elderberry, echinacea, and astragalus that have a long history of use. Ester-C is exclusively formulated for Solgar and provides an extensively researched, non-acidic vitamin C that is gentle on the stomach. Once taken, it is retained in white blood cells for up to twenty-four hours - thats twice as long as standard ascorbic acid. Vitamin D is often called the sunshine vitamin and is produced by the interaction of sunlight on skin. It is a fat-soluble vitamin and not only supports immune system health but is also needed for healthy bones and teeth. When sun exposure is limited, vitamin D levels may not be adequate. Zinc supports several aspects of immune health. It ensures normal development and function of immune cells and also supports the skin barrier which protects against foreign invaders entering the body. Comprehensive immune support formula Includes Ester-C - a unique form of vitamin C that is non-acidic and gentle on the stomach Contains immune supporting ingredients such as vitamin C, vitamins A, B6, B12 and D3, and zinc Formulated with botanical ingredients including elderberry, echinacea and astragalus Easy-to-swallow softgels About Solgar Since 1947, Solgar has created the finest nutritional supplements in small batches, based on tireless research and using only the finest raw materials. When it comes to quality, Solgar is The Gold Standard. With more than 300 products that bear the hallmark of the gold label, distributed in over 60 countries across the globe, Solgar is trusted by millions of consumers worldwide. They are also committed to protecting the environment and have been Carbon Neutral since 2010. Solgar Ester-C Plus Immune Complex features scientifically studied immune system supporting nutrients and is designed to help maintain immune system function throughout the year.