Fig. 5From: Oral supplementation with fish cartilage hydrolysate in an adult population suffering from knee pain and function discomfort: results from an innovative approach combining an exploratory clinical study and an ex vivo clinical investigationEvolution of the concentration of circulating hydroxyproline in blood. Values are presented as mean ± SEM. The differences were considered statistically significant at p < 0.05 with * for p < 0.05; ** for p < 0.01; *** for p < 0.001; **** for p < 0.0001 and ns for p > 0.05 [28]Back to article page