Feed additives and supplements

I know that this has been discussed ad nauseum but can I get some input concerning feed supplements?  I am interested in maximizing muscle mass without inhibiting adding finish.  Does anybody use Optiflex?  Tell me about it if you have.  I would welcome conversation on any other products that might work.  FYI, our steers are between 850 and 920 and will show in July.

I just wanted to bump this because I didn't get any response.  Hopefully, someone out there is using something of value.  Thanks in advance for the help.

Try Honor show chow champions drive and power fuel..great products. Will do what you want. Contact your local purina dealer for more info or check out hte website! The Optiflex does the same thing as paylean for pigs. It is not meant to be fed year round like the HSC products, and it can have side effects. But works well!