Dr. Clark claims that Ornithine is a natural amino acid. She claims since it's natural that it does no harm and she recommends it as a sleep aid and also an aid to get ammonia out of the brain.(from dead parasites) She claims it might take a few days to get fully into the brain. you can take up to 8 500mg tablets.
the reason she recommmends it for the liver cleanse is because some people have a hard time sleeping after they take the oil mixture. I have problems sleeping, but I have never had a problem sleeping when I do a liver cleanse.
See what works for you. I personally tried melatonin and it gave me a headache. To each his or her own.