Find a good Nutritionist and ask them that question. I like http://rawshefsteph.com she is good and knows lots of healthy ways to get amino acids naturally as well.
There are many brands out there that claim they have the best product. Not all of them have enough or substantial clinical research behind them to support their claims, but there are few that do. Most of them are a waste of time and money and those that actually do work, have to be taken at the correct dosage amount in order to have a positive effect.This is the reason why talking to a dietitian or a nutritionist might be a good idea.