6g as you have it is the effective dose. Max dosage for humans has only been studied up to 15g and no adverse side effects. So if you want to take another 6g, youre fine.
"To supplement L-citrulline to enhance sports performance, take 6,000 – 8,000 mg of citrulline malate about an hour before exercise. On days that you don't exercise, it can be broken up into smaller doses. "
"In humans, 15g citrulline taken acutely does not appear to cause diarrhea or intestinal upset "
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