B7-33
A single-chain peptide derived from the B-chain of human relaxin-2 that selectively activates the relaxin receptor RXFP1. Studied for anti-fibrotic effects in heart, lung and kidney; evidence is from cell and animal studies.
Not approved. Research use only.
Look it up on Wikipedia3 listings across 2 independently tested vendors, ranked by price per milligram after coupon codes anyone can use. Vendors you can only order from by message are hidden.
Daily price tracking started October 7, 2026; a price-history chart appears here once a few days have been collected.
| Vendor | Trust | Listing | Vials | Price | Per mg | |
|---|---|---|---|---|---|---|
Qingdao Sigma Chemical QSC #69 by metascore |
B7-33 6mg | 20-Vial Kit | RXFP1 Relaxin Analogue | 20 × 6 mg = 120 mg | $610.00 $30.50 per vial |
$5.08 | Buy | |
Qingdao Sigma Chemical QSC #69 by metascore |
B7-33 6mg | 10-Vial Kit | RXFP1 Relaxin Analogue | 10 × 6 mg = 60 mg | $330.00 $33.00 per vial |
$5.50 | Buy | |
Core Peptides #282 by metascore |
Metascore 70 medium confidenceFinnrick 76%PepIndex 24/100Bought vials 92% of label · 4 testsTitrateLab · PeptideBase · Peptide Critic · PeptideCheckedNo report for thisOnline checkout |
B7-33 – 6MG | 1 × 6 mg | $60.00 | $10.00 | Buy |
Mixing a 6 mg vial
What each common amount of bacteriostatic water gives you on a U-100 insulin syringe. Pick a vial size above to change it.
| Water | Strength | Per 10 units (0.1 mL) | Per unit |
|---|---|---|---|
| 1 mL | 6 mg/mL | 600 mcg | 60 mcg |
| 2 mL | 3 mg/mL | 300 mcg | 30 mcg |
| 3 mL | 2 mg/mL | 200 mcg | 20 mcg |
| 5 mL | 1.2 mg/mL | 120 mcg | 12 mcg |
Discussions elsewhere
Experiences and questions about B7-33 on other sites. Treat anecdotes with care.
B7-33: questions people ask
What is B7-33?
Relaxin-2 analog peptide. A single-chain peptide derived from the B-chain of human relaxin-2 that selectively activates the relaxin receptor RXFP1. Studied for anti-fibrotic effects in heart, lung and kidney; evidence is from cell and animal studies.
How much does B7-33 cost?
The cheapest B7-33 from an independently tested vendor is $5.08 per mg (Qingdao Sigma Chemical QSC, B7-33 6mg | 20-Vial Kit | RXFP1 Relaxin Analogue, $610.00). Across 3 listings from 2 vendors the median is $5.50 per mg.
Where can I buy B7-33?
2 vendors tested by Finnrick sell B7-33. The cheapest per mg right now: Qingdao Sigma Chemical QSC ($5.08), Core Peptides ($10.00). 0 of them publish a lab report (COA) for B7-33; compare lab scores and reports in the table above before buying.
How much bacteriostatic water for 6 mg of B7-33?
Adding 2 mL of bacteriostatic water to a 6 mg vial of B7-33 gives 3 mg/mL: each 10 units on a U-100 insulin syringe holds 300 mcg. With 1 mL it's 6 mg/mL (600 mcg per 10 units); with 3 mL, 2 mg/mL (200 mcg per 10 units). More water makes small amounts easier to measure. Mixing charts: 6 mg.
Is B7-33 FDA approved?
Not approved. Research use only.