AT LEAST 20 grams para-training.

Most definitely one of the most worth while supplements if dosed correctly. The efficacy of the supplement is entirely correlated with the amount dosed.

Speaking from personal experience, as well as the experiences of anyone else with whom I've spoken that have done similarly, mega-dosing BCAAs para-training is the best, albeit pricey, method of supplementing with them. Start with 20 grams and work your way up 40-50 grams.