Dietary supplements containing vitamins and minerals. A vital, active immune system is essential for human health – at any age and in any season. If the body lacks crucial nutrients, the immune system cannot optimally perform its protective and defensive functions. Vitamins C and D3, zinc, and selenium are especially important for a healthy immune system, as they have been proven to contribute to its normal function. Highly concentrated in a single daily tablet, these vitamin C+zinc+D3+selenium tablets offer a convenient and effective way to actively support your bodys defenses and immune system – for an entire year!