I'm looking to add some weight to my frame and eat 5-6 small meals a day,the only problem is,I don't get enough protein in those meals or on days where I cannot have that mount of meals I miss out on protein.

1>)So I was wondering if anyone could recommend me a protein shake?

2.)Also,which are the worst/ones you've had bad experience with?

3.*)Also,is it common for boxers have protein shakes and are there any side effects?

I'm not looking to spend OTT amounts of $$$ on the shake but I'll consider all recommendations.

CC for any responses.