Rated 4.8 / 5.0 | ‘’Excellent’’
Rated 4.8 / 5.0 | ‘’Excellent’’
High-Purity Peptides for Research Use
Independently tested to ≥99% purity, with a third-party certificate of analysis on every vial. What's on the label
is exactly what's inside.
Best price per mg
Same-day US shipping
Protected Shipping
Third-Party Tested
Protected Shipping
Third-Party Tested
Why Choose Peptide First?
Stronger value, professional standards, and verified quality in every order.
Protected Shipping
Third-Party Tested
Exceptional purity
Every batch independently assayed by HPLC and mass spec to 99%+.
Fast delivery
Order before 2pm ET for same-day US dispatch to all 50 states.
Transparent quality
A downloadable COA for every batch. Match the lot number on your vial before you begin.
Protected Shipping
Third-Party Tested
How it works in 3 simple steps
Independently tested to ≥99% purity, with a third-party certificate of analysis on every
Step 1
Find your compound
Browse the full catalog with complete specs, public COAs, and batch reports.
Step 2
Add to cart
Choose your compounds and vial sizes. Multi-vial pricing is applied at checkout.
Step 3
Place your order
Check out in minutes. Orders ship from the US with full tracking included.
Protected Shipping
Third-Party Tested
Rated 4.8 / 5.0 | ‘’Excellent’’
What researchers Say About us
Rated 4.9 / 5.0 | ‘’Excellent’’
The best on the market
"First thing I did was check the COA against the lot number on the vial, and it matched. Independently verified purity, with the certificate right there to confirm it.
Alex G.
Verified Member
Rated 4.9 / 5.0 | ‘’Excellent’’
Same purity, better price
"I was paying noticeably more elsewhere for documentation that wasn't half as clear. Same verified purity, lower cost per mg, paperwork on every batch. Thanks Guys!."
Dan F.
Verified Member
Rated 4.9 / 5.0 | ‘’Excellent’’
Fast Delivery to the US
"Placed the order in the morning, shipped that same day, tracked the whole way, arrived properly packed. Third order in and it's been identical every time. That kind of consistency is rare here."
Verified Member
Protected Shipping
Third-Party Tested
WBetter value, fully verified
Same compounds, different standard.
Protected Shipping
Third-Party Tested
Batch-matched COA
Identity testing disclosed
Purity method disclosed
Lot traceability
Multi-vial savings
USA tracked delivery
Responsive support
Other Suppliers
Not always
Often unclear
Often unclear
Limited
Protected Shipping
Third-Party Tested
Why researchers keep coming back
99.27%
average assayed purity
100%
of batches third-party tested
80,000+
orders fulfilled across
all 50 US states
68%
of customers reorder after their first
80,000+
orders fulfilled across
all 50 US states
Protected Shipping
Third-Party Tested
Frequently Asked Questions
Are your peptides third-party tested?
Yes - every batch, without exception. Each is independently assayed for identity and purity, and the certificate of analysis is available before you buy. You can match the lot number on your vial to its exact certificate, so what's documented is what's in your hand.
What purity can I expect?
Every compound is verified to 99%+, with the precise figure for your specific batch recorded on its certificate of analysis. We don't publish a round number and hope - the assay data is there for you to check, batch by batch.
How fast do orders ship?
Orders placed before 2pm ET ship the same day, sent from the US with full tracking. Most reach you within a few business days.
How should these be stored?
Store lyophilized vials away from light, refrigerated or frozen per the temperature on each product page. Once reconstituted, keep cold and use within the window appropriate to the compound. Full handling detail sits on every product page.
Can you advise on dosing or administration?
No. All products are supplied strictly for laboratory and research use and are not for human or animal consumption, so we don't provide dosing, preparation, or administration guidance of any kind. For research parameters, consult the published literature for the compound.
What's your return policy?
Because these are research materials, we can't accept returns once an order has shipped. If your order arrives damaged or incorrect, contact us within
30 days and we'll put it right.
Protected Shipping
Third-Party Tested
FREE SHIPPING on all orders over $150
Rated 4.8 / 5.0 | ‘’Excellent’’
The best value in research peptides
The same verified purity others charge a premium for - at a fairer price per mg, tested in the US and shipped from US.
Protected Shipping
Third-Party Tested
