Databases :: Locking Down The Proc Table?

I'm working on locking down some MySQL user accounts. At the moment I typically grant my user accounts execute privileges over the required stored procedures within a schema.Now I'm looking at the proc table in the mysql schema. The common wisdom that's quoted many times on various websites says "Stored procedures require the presence of the proc table in the mysql schema".By granting select access over the proc table stored procedures will work. But if I removed the above select privilege and grant the user execute privilege over the entire mysql schema the procedure will also work.

Does anyone have any ideas about the security issues by choosing one of the above over another?I would prefer to lock the proc table down all together so the user cannot see it cannot select from it.