Muscle-Building Help

Have I mentioned that my husband has been busy getting fit? He's been exercising a lot, eating right, and really working hard to have a healthy lifestyle. And I can say that it is quite paying off well. And he noticed that, too. But there's something he still wants to achieve, though. He wants to build muscles to look better. He's thinking of taking pro complex to be able to do that. He said that there are these muscle-building protein stuff that help one build muscles. He said one needs to take it in. Oh, I'm not very knowledgeable about that, so I told him why not research about it to get informed. He says he'll do just that because he's really serious about this muscle-building endeavor. Oh well, I do hope he gets to achieve that.