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Source of Life Immune Booster Adult Formula is a revolutionary bi-layered tablet designed to supply rapid-release essential nutrients while simultaneously delivering the extended release of powerful botanicals. Every bi-layered tablet supplies powerful levels of vitamins A, C, and E, all of which have been shown to fortify the immune system. Defense-boosting zinc is also included in the fast-release layer. The powerful extended-release botanicals are activated slowly throughout the day, supplying further nutritional support with ARA-Larix, olive, leaf, andrographis, elderberry and echinacea.