Give it a try. The problem is getting them to actually take it! :-) if you can actually get the kid to ingest it, I recommend a trial of fish oil for most with autism. Although more research is needed, some research suggests modest benefits from fish oil, and no evidence of any harm. In general, fish oil and a multivitamin (+/- iron depending on constipation) are a good idea for most kids with autism.
Fish oil. There is usually no problem, and it may help. The one problem is that families may ignore more proven treatments. So try fish oil but do not ignore counseling, special education, group counseling, and psychiatric medication.
No. Should not be any problem using fish oil supplements.
Mercury. This depends on the source of your fish oil, and if there was significant buildup of mercury in the fish that was utilized to manufacture the fish oil. Here is a good study from Mass general on the subject. Stay away from anything with "Jennie McCarthy" on it. Of note, placebo effect in place for these small studies. Http://www. Massgeneral. Org/children/services/lurie-center/Omega-3.aspx.
No Answer. To my knowledge, there is no research in children demonstrating consistant improvement of anything by adding fish oil. It is all theoretical, thus there is no standard dose.
Fish oil no help. Fish oil does not improve the attention span in adhd children.
There was one large. Study that showed that giving both omega 3 & omega 6 helps children with adhd who are being treated with stimulants.