So it’s more of if you’ve met your maximum potential at that dose. Think of your muscular potential at different levels. Natty will have you at a baseline muscular potential. Once you max that out and add let’s say 300mg of gear, it raises that potential. Once you max that potential out, then you need 500mg to exceed.
So you don’t build up a tolerance, more it’s just adaptation your body has made that you would require more for the same benefit. Just like calories. If you were 200 lbs and X amount of calories put on size, you might not be putting on as much size at 220+ as your body needs have changed, not that you developed a calorie intolerance