Depends on the precise kind and amount of the BCAA's found in your protein product. Some proteins have a rather complete BCAA content, and with them there is no need to use additional BCAA's, but this is not always the case. Sometimes the manufacturers will put minimal amount of BCAA's, in order to be able to say on the label that it has the BCAA's, and hence increase their prices. So try to find that out, and you will get an answer to your question.