Wikipedia
PGG-glucan
Poly-[1-6]--D-glucopyranosyl-[1-3]--D-glucopyranose glucan (PGG glucan, Proprietary name Betafectin) is an anti-infective agent and a form or type of beta-glucan.
Betafectin is a PGG-glucan, a novel β-(1,6) branched β-(1,3) glucan, purified from the cell walls of Saccharomyces cerevisiae
It is a macrophage-specific immunomodulator