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Red cell GSH levels rose in patients on L-arginine (all evaluable, grey line, from 1221.9±424.9 μM week 0 to 1593.4±405.9 μM week 8, n=8, p=0.03), but rose insignificantly in patients on sildenafil (all evaluable, black line, from 1090.1±324.8 μM week 0 to 1318±459.0 μM week 8, n=6, p=n.s.).
