Having a protein shake like Vintage Brawn™ after you lift weights helps stimulate muscle protein synthesis, and thereby promote muscle growth and recovery. Since Classic BCAA provides similar benefits, it is better suited for use in between meals, when muscle protein synthesis tends to be the lowest.
Taking BCAAs before and/or after cardio can help preserve lean muscle and enhance recovery. Keep in mind that if you’re looking to actually gain muscle, then you’ll need to be doing plenty of resistance exercise, i.e. lifting weights.
Any time you lose body fat on a calorie-reduced diet, you’re almost certain to lose muscle alongside. Taking Classic BCAA and a high-quality protein like Vintage Brawn will help you protect, and even enhance, your lean muscle while you melt off the fat on top.