Beta Glucan (from yeast.)

Molecular formula  (C₆H₁₀O₅)n

Yeast beta glucan are notable for their ability to modulate the immune system. Research has shown that insoluble (1,3/1,6) β-glucan,

It has greater biological activity than that of its soluble (1,3/1,4) β-glucan (from Oat.). The differences between β-glucan linkages and chemical structure are significant in regards to solubility, mode of action, and overall biological activity.

Yeast beta glucan are known as "biological response modifiers" because of their ability to activate the immune system.