CJC-1295 / Ipamorelin vs Tesamorelin
Structural and analytical comparison · research use only
These materials are studied in the same pathway literature — growth-hormone secretagogue and GHRH-receptor research — but they are structurally distinct, and one of them is a two-peptide co-formulation rather than a single compound.
| Property | CJC-1295 / Ipamorelin | Tesamorelin |
|---|---|---|
| Composition | Two peptides co-formulated 1:1 by mass | Single peptide |
| Classification | GHRH analog (CJC-1295, without DAC) + selective secretagogue (Ipamorelin) | Stabilised GHRH(1–44) analog |
| CAS numbers | 863288-34-0 (CJC-1295) · 170851-70-4 (Ipamorelin) | 218949-48-5 |
| Molecular formulas | C152H252N44O42 · C38H49N9O5 | C221H366N72O67S |
| Molecular weights | 3367.97 g/mol · 711.85 g/mol | 5135.86 g/mol |
| Chain length | 29-residue analog + 5-residue pentapeptide | 44 residues, N-terminally modified |
| Supplied format | Single vial, lyophilized co-formulation | Lyophilized powder, sealed vial |
| Purity standard | ≥99.2% per component (HPLC) | ≥99.2% (HPLC) |
Single compound vs co-formulation
This is the distinction that matters when specifying a reference material. Tesamorelin is one peptide and produces one primary HPLC peak. The CJC-1295 / Ipamorelin material is two peptides supplied in a single vial, and its Certificate of Analysis reports purity per component — two identities confirmed, each against the ≥99.2% floor. A co-formulation is not a blend of unknown ratio: ours is specified 1:1 by mass.
Molecular scale
Ipamorelin is by far the smallest molecule here at about 712 g/mol — a pentapeptide. Tesamorelin is the largest at roughly 5,136 g/mol, and it is the only one of the three carrying sulfur. Those differences make all three unambiguous to confirm by mass spectrometry.
Supplied strictly as a research reference material for in-vitro laboratory use. Not for human or veterinary use.
Frequently asked questions
Is CJC-1295 / Ipamorelin one compound or two?
Two. It is a co-formulation of CJC-1295 (without DAC) and Ipamorelin, supplied 1:1 by mass in a single lyophilized vial. Its Certificate of Analysis confirms purity per component.
How does Tesamorelin differ structurally?
Tesamorelin is a single 44-residue, N-terminally modified GHRH analog with a molecular weight near 5,136 g/mol — larger than either peptide in the co-formulation, and the only one of the three containing sulfur.