BCAA is effective in helping women bulk up. Since you need both BCAA and protein for muscle growth, taking them together can help you get bigger faster. However, you should consult your local doctor before starting any new supplement regimen. Many women want to build muscle as part of their fitness routine, but they are hesitant to take BCAA because they're worried it will make them bulky. In reality, if you're following a regular workout routine and eating a healthy diet, you can see greater results from your workouts.