Brassica rapa Cytisus scoparius DPP-IV inhibitory peptides Gaba Gaba-rich product Meretrix meretrix oligopeptides Nibea japonica Pleurotus ostreatus Quercus robur Taxus baccata L. red arils amino acids anti-hypertension antioxidant activity bee products bioactive molecules bioactive peptides bioactivity cholecystokinin cosmetics cyclophosphamide elements emulsion fermentation fermented foods fish byproduct hydrolysate functional matrices glucagon-like peptide 1 health benefit health benefits honey