Ecological Formulas immune support supplements include vitamin C in several forms, such as Vitamin C Crystals from Tapioca, Vitamin C-1000, Vitamin C-1000 Non-Corn and Buffered C Crystals. The collection also includes Lactoferrin, Colostrum, Black Elderberry Extract, Quercetin-C and the LTP thymic peptides glandular formula. Consult the label and other product information before use.