What is the best muscle building supplement?

No supplement is of the slightest use for building muscle. USELESS!! I don't know what force factor is, but muscle milk is something football players use to gain weight (fat) so they can knock people down. A bull is strong. What does he eat? Grass.

Any protein powder should do fine. But protein is a must (it's the raw material for muscle growth). To build muscle you want upto 12 grams of branch chain amino acids (BCAA). Look for a protein powder that lists 6-12 grams of BCAA's which are in most. They should have Leucine, Isoleucine, and valine- if they don't forget it. It should also be as low as possible in fat and low as possible in carbs to make more room for BCAA's and protein to skip the extra calories. Creatine is also a must but less important than protein. I would mix the two together for a super supplement lol they already exist though.

Skip muscle milk. It's just chocolate milk in disguise. I'm not the biggest supplement guy but there are 3 things at most that one needs. Some other guys get a ton of crap but I just don't see how spending that much money on supplementation is worth it especially when what you eat and how you workout dictate most of your success or lack thereof. That being said protein powder, creatine and a preworkout supplement (optional) is what I use. Protein powder is great for post workout b/c it's fast acting. Creatine has helped me the most especially when you're cutting and you are low on carbs. Preworkout supplements can help give you a jolt especially when you're tired from lets say work etc. Hope that helped. If you want more advice on supplementation, feel free to check out my youtube channel below. I did a review on Jack3d (preworkout supplement). Once there, click on playlists, "diet/health fitness". it's there. best of luck. link below. http://www.youtube.com/user/sanitary103?feature=mhee#p/u