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Four compounds, and three of them are the same molecule with different modifications. Once you see that, the differences stop being arbitrary.
Ipamorelin vs Sermorelin vs Tesamorelin vs CJC-1295
Four compounds get compared constantly, and three of them are the same molecule with different modifications. Once you see that, the differences stop being arbitrary.
Sermorelin, tesamorelin and CJC-1295 are all GHRH analogs. Ipamorelin is not, and that is the real dividing line. The background on how the two families work covers the mechanism.
The quick comparison
| Family | Receptor | Duration | |
|---|---|---|---|
| Sermorelin | GHRH analog | GHRH receptor | Very short, minutes |
| CJC-1295 no DAC | GHRH analog | GHRH receptor | Around 30 minutes |
| CJC-1295 with DAC | GHRH analog | GHRH receptor | Days |
| Tesamorelin | GHRH analog | GHRH receptor | Extended |
| Ipamorelin | Ghrelin mimetic | GHS-R1a | Around 2 hours |
Sermorelin
Sermorelin is GHRH(1-29), the first 29 amino acids of natural growth hormone releasing hormone. Natural GHRH is 44 residues long, and researchers found that everything needed for activity sits in that opening stretch. The rest can be removed without losing function.
Because it is essentially unmodified natural sequence, DPP-4 clears it quickly and its duration is measured in minutes. That produces a sharp, short pulse that closely resembles a natural one. It is the most physiologically faithful option in the group and the shortest acting, and those are two sides of the same fact.
Stocked in 5 mg and 10 mg vials.
CJC-1295, and what DAC changes
This is the compound people get confused about, because two very different things share the name.
The base molecule is GHRH(1-29) with four amino acid substitutions. Each one blocks a specific route of degradation, including the DPP-4 cut site. This version, often labeled CJC-1295 without DAC or Modified GRF(1-29), lasts around thirty minutes. Longer than sermorelin, still a pulse.
DAC stands for Drug Affinity Complex. It is a chemical group added to the molecule that binds covalently to albumin in the blood. Once attached to albumin the peptide is shielded from enzymes and too large for the kidneys to filter, so its half life stretches into days.
That single addition changes what the compound does. Without DAC you get a discrete pulse that fits the natural rhythm. With DAC you get a sustained elevation often described as a bleed, where GHRH signaling is continuously present rather than arriving in bursts. Same base peptide, two different behaviors.
Tesamorelin
Tesamorelin is GHRH(1-44) with a trans-3-hexenoyl group attached at the N-terminus. That addition protects the molecule from DPP-4 and extends its duration well beyond sermorelin.
It has the most developed clinical record of the four. Tesamorelin was studied and approved for reducing excess visceral abdominal fat in people with HIV associated lipodystrophy, and the trials specifically measured visceral adipose tissue rather than total weight. That distinction matters, because visceral fat is the deep abdominal depot around the organs, not subcutaneous fat.
Available in 5 mg and 10 mg, and paired with ipamorelin in a combination vial.
Ipamorelin
Ipamorelin is the odd one out. It is a pentapeptide, five amino acids, and it works on GHS-R1a, the ghrelin receptor, not the GHRH receptor.
The earlier compounds in its family, GHRP-6 and hexarelin, also drove up cortisol and prolactin. Ipamorelin was developed to be selective, and research consistently reports growth hormone release without meaningful movement in either. That clean profile is its whole reason for existing.
Because it operates on a different receptor from the other three, it stacks with them rather than competing. Supplied in 5 mg and 10 mg vials.
How to think about choosing
The decision is really about two questions.
First, pulse or sustained signal. Sermorelin and CJC-1295 without DAC produce discrete pulses that mirror natural release. CJC-1295 with DAC produces continuous elevation. These are different research questions, not better and worse versions of one thing.
Second, one pathway or two. A GHRH analog on its own works through one receptor. Adding ipamorelin brings in the ghrelin receptor as well, and the combined effect is larger than the sum of the parts. That is why CJC-1295 without DAC paired with ipamorelin is the most common combination: a natural shaped pulse from two directions at once.
Common questions
Is CJC-1295 with DAC better than without?
They do different things. With DAC gives sustained signaling over days. Without DAC gives a pulse of about thirty minutes that fits the body’s own rhythm. The choice depends on which pattern you are studying.
What is Modified GRF(1-29)?
Another name for CJC-1295 without DAC. It refers to GHRH(1-29) carrying the four stabilizing amino acid substitutions but no albumin binding group.
Why combine a GHRH analog with ipamorelin?
They act on two separate receptors through two separate signaling routes. Used together the release is greater than either produces alone, which is a documented synergy rather than simple addition.
Why is sermorelin so short acting?
It is close to unmodified natural GHRH sequence, so DPP-4 clears it at the natural rate. The other GHRH analogs carry modifications specifically designed to prevent that.
TL;DR
Three of the four are GHRH analogs and differ mainly in how long they last. Sermorelin is the natural fragment and clears in minutes. CJC-1295 without DAC lasts about thirty minutes; adding DAC binds it to albumin and stretches that to days. Tesamorelin carries an N-terminal modification and has the strongest clinical record, specifically on visceral fat. Ipamorelin is the outlier, acting on the ghrelin receptor instead, which is why it combines with the others rather than replacing them.
Everything we supply is lab tested for purity and identity, and sold as research grade material for laboratory and research use. See the growth hormone and anti-aging range.
Featured image by Navy Medicine, public domain.
