Mary
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I tried Now Foods Arginine 500mg and Citrulline 250mg, Capsules for at least a week. Actually, it may have made me more tired, if anything. It's always hard to tell whether something is having an effect, or if it's just regular CFS ups and downs, but I did feel more tired on Citruline and Arginine for what that's worth.
Citrulline and arginine can lower cortisol, leading to fatigue. This happened to me when I tried taking arginine in the morning a couple of years ago and within 2 or 3 days was quite tired - I had been expecting (hoping rather) for an energy boost. I had to stop the arginine and increase my adrenal glandular to get back to "normal".
However, I'm currently trying citrulline at night before bed in an attempt to lower possible high nighttime cortisol (which can cause insomnia) and this is not leading - so far - to increased fatigue. So maybe time of day it's taken is important. But I've only taken the citrulline for a couple of days and am watching out for increased fatigue which might still happen. And I've read that citrulline malate especially is supposed to help with workout recovery but have not tried it yet