i know there have been some studies that have shown arachadonic acid to be a good muscle building supp. i saw one in muscular development (not sure which one). I'm sure if you google it you'll be able to find some more.
I feel that Arachidonic Acid is a bullshit product. The original product containing this in gredient, X Factor (pure Arachidonic Acid product), looks extremely fishy! The prodcut recommends that you take a FIFTY day cycle: which means purcasing 2 bottles + Increase your protein intake + Increase your daily caloric intake + Restrict ingestion of other healthy fats and oil. By the time you make all of those adjustments it is impossible to know if any of your success could be attributed to the product.
I took A.Acid in Gasp.Nut. Liquid Halodrol last summer and felt as an over the counter sup that it increased my strength moderately the first time I used it, and then barely the second time I used it, and not at all the third I used it. I have thus stopped using it, but perhaps would benefit from it again now that I haven't used it in a long time. Summary, this product may be all right for one or two cycles, but I wouldn't use it consistently.