well of course your natural test is low while your on cycle! i read up on testim, but im still not sure what how many mg's are in each packet? How many miligrams would you say you "apply' in a week? then we can compare it to that of injectable test. If its not a significant amount it may be better off coming off of both at the same time when your p-mag is done, then just run a thorough pct. Point being, if the test dose is low, or below the norms for a test cycle, then staying on it without pct may cause you to loose your gains from p-mag