A peptide fragment is a portion of a larger peptide or protein. Some fragments are active on their own, which is why many research peptides are fragments of natural molecules rather than the whole thing.
What a fragment is
If you take a long peptide or protein and use only a section of it, that section is a fragment. The idea is that the active part of a large molecule can sometimes be captured in a much shorter, easier-to-produce piece.
Fragments in the research world
Several research peptides are fragments. TB-500 corresponds to a region of thymosin beta-4; Kisspeptin-10 is a fragment of kisspeptin; Semax is based on an ACTH fragment.
Browse research-grade peptides
Every Axis compound is third-party tested to 99.4%+ purity, with a certificate of analysis on every batch.
Why fragments are used
Working with a short active fragment is often simpler than the full molecule: it is easier to synthesize and study while retaining the activity of interest.
Key takeaways
- A peptide fragment is a portion of a larger peptide or protein.
- Some fragments are active on their own.
- Examples: TB-500, Kisspeptin-10, Semax.
- Fragments are often easier to synthesize and study.
A note on research use
The peptides supplied by Axis Peptide Labs are reference compounds for laboratory and research use only. They are intended for qualified researchers working in academic, institutional, and analytical settings. They are not drugs, foods, cosmetics, or medical products, and they are not intended for human or veterinary consumption. Documented identity and documented purity are what matter most when sourcing a compound, both of which are published on the Axis certificates of analysis page.
