Polysaccharopeptides are protein-bound polysaccharides (carbohydrates) that are found in turkey tail. Krestin (PSK) and Polysaccharide Peptide (PSP) are two types of polysaccharopeptides. Both PSK and PSP possess powerful immune-boosting properties. They promote immune response by both activating and inhibiting specific types of immune cells and by suppressing inflammation.
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