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Serum concentrations of protocatechuic acid and metabolites over 24 hr in 16 healthy adults after consumption of 150 g of chicory. (a‐c) Serum concentration–time curves (0–24 hr) of protocatechuic acid in the free (a)‐, glucuronide (b)‐, and sulfate (c)‐conjugated forms. Values are the means ± SD, n = 16. *Different from baseline (0 hr), p < .05
