Now, what that ultimately means is enzymes speed up the rate at which chemical reactions take place. Now, by speeding up a chemical reaction reaction enzymes essentially decrease the time that is needed for that particular chemical reaction to actually reach equilibrium. Now, this is a very important thing to remember about enzymes. Enzymes decrease the time that is needed to reach equilibrium. But enzymes do not actually change the equilibrium itself. They do not change the energy of the product and reactants, nor they actually change the amount of product or reactants that is formed at equilibrium.