B7-33 Research Peptide
B7-33 is a single chain of amino acids copied from part of human relaxin-2, a hormone with two chains held together by sulfur bridges.
- Purity
- >99%
- Dispatch
- Dispatched next business day with cold-chain delivery
- Cold chain
- Temperature-controlled packaging from lab to door
- Certificate
- Certificate of Analysis available on request for this batch
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Ships Next Day
Orders confirmed before 12pm EST ship the same business day; orders after 12pm EST ship the next business day. Monday to Friday.
Quality Guaranteed
Every batch is HPLC-tested to >99% purity. Certificate of Analysis available on request; MSDS available on request.
Certificate of Analysis Available on Request
Request this batch's certificate using your order number.
What is B7-33?
B7-33 is a single chain of amino acids copied from part of human relaxin-2, a hormone with two chains held together by sulfur bridges. That structure makes the natural hormone awkward and expensive to make, and B7-33 was designed as a simpler single-chain version of the part that matters. The material sold here is made in the laboratory. Research on it has centered on scarring in the heart and lungs, and on how blood vessels behave.
Technical Specs
Labeled quantity is net peptide content, not gross salt weight.
B7-33 Research & Reference
What B7-33 does in published studies, and how to work with it in the laboratory, are covered in full on two dedicated pages rather than summarised here, so neither the evidence nor the handling detail is cut short.
Safety Data Sheet
The safety data sheet for B7-33 is below as a PDF, in the 16-section GHS format covering identification, hazards, handling, storage and disposal.
Frequently Asked Questions
Is B7-33 independently tested for purity?+−
Yes. Every batch of B7-33 is tested by an independent third-party laboratory using HPLC and MS-UPLC, confirming purity and mass identity before the batch is released. Pure Peptides does not test its own material.
What does "Research Use Only" mean?+−
It means B7-33 is supplied for in-vitro laboratory research and for no other purpose, and must not be administered to humans or animals. B7-33 is legal to purchase in the United States for in vitro and non-clinical laboratory research. It has no FDA approval and no approved human use. B7-33 is not a scheduled substance under the Controlled Substances Act. Sold strictly for qualified research use, not human or veterinary administration.
How is B7-33 shipped and stored?+−
B7-33 ships from US stock with cold-chain packaging and full tracking; orders placed before noon EST on business days are typically dispatched the same business day. On arrival, store the lyophilized powder at -20°C or below, dry and protected from light.
Is B7-33 the same as relaxin?+−
No. Human relaxin-2 is a two-chain hormone held together by three sulfur bridges. B7-33 is a single chain derived from its B chain, designed to be simpler to make. Several studies have run the two side by side and reported similar effects on scarring, and one reported a difference: unlike relaxin, B7-33 did not promote prostate tumor growth in mice. Relaxin has its own clinical literature and none of it is evidence about this analogue. The Published Research tab cites only work done on B7-33.
What research has been published on B7-33?+−
Around forty indexed records, all preclinical. The Published Research tab covers five of them: the 2016 paper that designed the peptide, two mouse studies of heart injury, a rat study of blood vessel function where the effect appeared in one artery and not in two others, and a study of an implant coating that released it. No study in people has been published.
Related Compounds
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