The phrase "moderate levels" means a reasonable amount, neither too high nor too low. It suggests a balanced or average amount that is not extreme or excessive. Full definition
It wasn't eliminated totally, but that's a good reason to keep your caffeine intake regular as well as at moderate levels. (supernaturalacnetreatment.com)
Your dog's diet should be rich in protein with moderate levels of fat and limited carbohydrates. (petguide.com)
At more moderate levels of real rates, such as between 2 % and 5 %, higher valuation levels are the norm. (researchaffiliates.com)