That's because these drugs have very short half lives. You inject at night before bed and it releases gH, then goes back down to normal fairly quickly. Also, 4 months isn't long enough. You only start to see benefits from sermorelin after about 3 months. Get majority of benefit by 6-8 months. Then, if you stop, your pituitary continues to release more gH for a while after you stop. But it releases at night when you sleep, so getting an igf1 test during the day will not show anything. Only when you administer synthetic hgh will you see "chronically high" gH levels, which is why you'll also see side effects. But, you have to commit to the money you're going to spend and know that it's going to be at least 6 months. After 6 months, many people go from a 7 night injection to a 3 night "maintenance" therapy regimen. You know sermorelin is starting to kick in when you start dreaming like crazy! You're going into a deeper sleep. You can also purchase a blood sugar test kit, test your blood sugar levels, inject sermorelin, then test again in 10-15 min. If your blood sugar drops, that's the IGF1 working. That's a good way to test if it's real.