Product Details (Formerly NK Stim, an Ortho Molecular Product) Immu-Stim Essentials provides the powerful immune supporting combination of Arabinogalactan, Oleuropein (the active ingredient found in olive leaf extract), Acemannan (the immune-stimulating component of aloe vera concentrate) and chelated zinc. Why Immu-Stim Essentials? Larch Arabinogalactin Arabinogalactin has been shown to support positive immune and reticuloendothelial function. Arabinogalactins are now being used to support a number of immune functions. Aloe Vera Extract (200:1) Our potent 200:1 extract has had the aloin-like compounds removed and is not a stimulating laxative. Aloe Vera has long been studied for its role in general immune-system support.