Mysql 5.5: Optimizing all tables with mysqlcheck - is it useful to run the -check option along with -optimize?

Question

I plan on running 'mysqlcheck --optimize --all-databases' to clear up some fragmentation.

Would it be useful to run -check with this option or does the -optimize already take care of that? I am only concerned because we have large tables (over 100GB) and this is on a production system and we don't want to have unnecessary downtime.

tom.