Tesamorelin and CJC-1295 are both growth-hormone-releasing hormone (GHRH) analogues — peptides studied for how they prompt the pituitary to release growth hormone. Because they sit in the same family, they're often confused or treated as interchangeable. They aren't. Here's a clear side-by-side.

What each one is

Tesamorelin is a stabilised analogue of the full 44-amino-acid GHRH molecule. It's one of the most clinically characterised GHRH analogues in the research literature, which is a large part of why it's referenced so often.

CJC-1295 is a shorter modified GHRH fragment (based on the first 29 amino acids, GHRH 1-29). It exists in two research forms: with and without a "DAC" (drug affinity complex) modification that extends how long it circulates. It's very frequently paired with Ipamorelin — see our note on the CJC-1295 + Ipamorelin blend.

The key difference: molecule size and emphasis

Both work on the same GHRH receptor, but they're studied with different emphasis:

  • Tesamorelin is the full-length, heavily-characterised GHRH analogue — research around it is notably deep on metabolic and adipose-tissue endpoints.
  • CJC-1295 is a shorter fragment prized in research for its modifications that alter half-life, and it's most often studied in combination with a growth-hormone secretagogue like Ipamorelin, which acts on a different receptor.

So the practical distinction researchers draw is: Tesamorelin as a stand-alone, well-documented GHRH analogue; CJC-1295 as a modifiable fragment usually studied as part of a pairing.

Quick comparison

  • Family: both are GHRH analogues acting on the GHRH receptor
  • Structure: Tesamorelin = full 44-aa GHRH analogue; CJC-1295 = GHRH 1-29 fragment (± DAC)
  • Typical study context: Tesamorelin often stand-alone; CJC-1295 often blended with Ipamorelin
  • Research emphasis: Tesamorelin heavy on metabolic/adipose endpoints; CJC-1295 on half-life modification and synergy
  • Handling: both are lyophilised powders — store at −20°C, reconstitute with bacteriostatic water, refrigerate once mixed (work out volumes with our reconstitution calculator)

Sourcing in Australia

We hold Tesamorelin and CJC-1295/Ipamorelin in Australian stock, independently batch-tested with published Certificates of Analysis, dispatched same or next business day. When two peptides sit in the same family, verified identity on each is what tells them apart in practice — the CoA Library has the actual lab results.

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All products are supplied strictly for laboratory and in-vitro research use only. Not for human or veterinary consumption. This article describes fields of scientific research and is not medical advice or a claim about effects in humans.