Table 1 Detectable plasma concentrations of compounds that revealed a mean degree of phase II conjugation of less than 100 %: catechin (n = 5), caffeic acid (n = 3), U2 (n = 5) and U7 (n = 3) in samples of volunteers after repeated intake of 200 mg Pycnogenol once daily for five days.

From: Single and multiple dose pharmacokinetics of maritime pine bark extract (Pycnogenol) after oral administration to healthy volunteers