| My youngest son used it when he was a teen. He did experience some real concentration problems. He said he knew he felt confused or maybe depressed, but he couldn't quite put into words how he was feeling. He just knew something wasn't right. It was a very obvious change and it bothered him enough that it caused him to be concerned.
We went to the doctor's for a complete physical to rule out other possibilities.
His dermatologist monitored his use regularily throughout the several months he was on it....including regular blood work which is important. He still had some difficulty for a short time after he stopped using it.
It worked well with helping his skin....although dryness can be an issue. I know it works well, without ill effect, for many people, but I personally would not recommend it because of the behavior concerns. At the least, I would suggest being watchful for any possible behavior or concentration changes, or any other possible side effects, if someone were going to use it. As with any medication or treatment, what works great for one person, may cause problems for someone else. | 
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