Tesamorelin vs. Ipamorelin: Loti Labs Peptide Comparison The reason CJC 1295 and ipamorelin are stacked isn't marketing. It's receptor biology. The anterior pituitary contains somatotroph cells the cells that produce and release growth hormone. These cells have two distinct Sermorelin vs Ipamorelin: Which peptide is right for you? NiceRx Growth Hormone Peptides: The difference between Sermorelin, Ipamorelin, and Tesamorelin Some peptides focus on fat loss. Some focus on recovery. Ipamorelin is interesting because researchers study it for both. Why? Because it stimulates natural growth hormone pulses without strongly affecting other hormones.