Nature’s Plus® has formulated an exciting new dual approach to promoting a healthy immune system! 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. The Nature’s Plus commitment to excellence is evident in every bi-layered tablet, which 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, proven support, the way nature intended.