Fig. 7From: Combined L-citrulline and glutathione supplementation increases the concentration of markers indicative of nitric oxide synthesisFrom phase three, an illustration of plasma nitrite levels in humans following seven days of supplementation with L-citrulline and/or GSH. The symbol * indicates that a combination of L-citrulline (CIT) and GSH produced significant increases in plasma nitrite at 30 min post-exercise compared to the group supplemented with cellulose placebo (PLC) (p < 0.05)Back to article page