Testing
How HPLC purity testing actually works
What the number on a COA means, and why 99% is the bar.
Read ›Research use only
DomainPeptides sells products strictly for laboratory and research purposes. You must be 21 or older to enter.
By entering you confirm you are 21 or older and that all products are for research use only, not for human consumption.
Ships from the USA · 21+ · Research use only
FREE FedEx 2-Day on orders $200+·Third-party COA on every batch·RESEARCH USE ONLY, not for human consumption
US-based research-grade peptides
Purity,
Verified.
Third-party-tested research peptides with a published Certificate of Analysis on every batch. Proof, not promises.
★★★★★4.9 from 1,595 verified researchers
Batch-verifiedHPLC + MS, published COA
99.2%HPLC purity
0%+Average HPLC purity
0+Peptides in catalog
0Verified reviews
Same-dayUS dispatch
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The DomainPeptides standard
Verified standardFour steps between synthesis and your bench
01
Synthesized to spec
Sourced from vetted manufacturers and built to a defined specification.
02
Independently tested
Every lot goes to a third-party lab for identity and purity by HPLC and MS.
03
COA published
The certificate goes live on the product page, matched to your lot number.
04
Shipped from the USA
Packed for stability and dispatched same-day, FedEx 2-day nationwide.
Best sellers
View all 100+ ›Featured research peptides
Every listing links to its batch Certificate of Analysis. Identity and purity only, no dosing, no claims.
Certificate of AnalysisVERIFIED
CompoundBPC-157
Batch / LotLP-2417
MethodHPLC · MS
99.2%HPLC purity
Proof, not promises
Every batch is verified, and the results are public.
In a market full of unverified sellers, we compete on the one thing that cannot be faked: evidence. Each lot is tested by an independent lab and its COA is published on the product page.
- HPLC and Mass Spec
Identity and purity confirmed on every lot, targeting 99% or higher.
- Batch-traceable
Match the lot number on your vial to its published certificate.
- Independent labs
Third-party testing. Not our word, someone else’s data.
Our standard
In a market built on claims, we ship proof.
If it ships from us, its purity is published. That is the whole promise, and it is the reason researchers who read the COA first keep coming back.
Why researchers choose us
Built for people who read the COA first
Verified purity
Published third-party COA per batch. Nothing ships without proof.
Compliance first
Strictly research use only. Adult only. No health or dosing claims, ever.
Fast US shipping
Same-day dispatch before cutoff, FedEx 2-day across the country.
Rewards and support
Loyalty points, tiered pricing, and real humans when you need documentation.
Save more
Research stacks and bundles
Curated multi-vial kits at a bundle price. Each vial keeps its own batch COA.
Save 15%
Recovery Research Kit
The most requested pairing for tissue-repair studies
Save 18%
GH-Secretagogue Set
Paired sequences for GH-axis research
Save 20%
Cognitive Research Duo
Nootropic-sequence study pairing
Rewards program
Earn on every order
Collect points, unlock tiered discounts, and get early access to new batches. Refer a colleague and you both get credit.
Novice NucleotideAdept AminoPeptide ProdigySynthesis SageMaster of Molecules
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Affiliate program
15% commission
Creators and researchers earn recurring commission with a 365-day cookie and monthly payouts. Disclosures required, research-use messaging only.
Become an affiliate★★★★★
“COA matched the lot number on the vial exactly. HPLC came back at 99.4%. This is how it should be done.”
DR
D. Reyes✓ Verified owner
★★★★★
“Fast dispatch, clean packaging, and every batch has real documentation. I moved all of my sourcing here.”
MK
M. Kowalski✓ Verified owner
★★★★★
“Support actually answers questions and sends the paperwork I need. That is rare in this space.”
AT
A. Tran✓ Verified owner
Learn
Visit the blog ›Research and reference
Educational content on testing, handling, and the science. Our growth channel, since paid ads are off limits in this category.
Handling
Reconstitution and storage for lab reference
Best practices for handling lyophilized research peptides.
Read ›Compliance
What “research use only” really means
The compliance line every buyer and seller should understand.
Read ›For labs and bulk buyers
Wholesale and institutional pricing
Volume pricing, consolidated invoicing, and a dedicated account for laboratories and repeat buyers. Apply for a wholesale account and get a quote.
Get COA drops and restock alerts
New-batch certificates, back-in-stock notices, and research reference. No hype.
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