Made fresh. Then frozen.
Each product starts as a fresh batch and is then frozen.
Excalibur Peptides · U.S.-based research peptide supplier Research peptides, documented.
Excalibur Peptides supplies lyophilized research peptides for in-vitro laboratory research to buyers 21 or older in the U.S. Every product is tested by Freedom Diagnostics Testing for purity by HPLC and identity by LC-MS, and anyone can open the reports on the lab's own site.
Sign in or create a free research account to view the catalog.
For in-vitro laboratory research use only. Not for human or animal consumption.
Fresh. Frozen. Third-party tested.
How are Excalibur Peptides products made, tested and labeled?
Excalibur Peptides products are made in fresh batches, kept frozen until they ship, tested by an independent lab and labeled with a batch ID.
−10 °F. Until the day it ships.
Frozen stock is kept at −10 °F, about −23 °C, until the order ships.
Tested outside. Checkable outside.
Freedom Diagnostics Testing, not Excalibur Peptides, runs the tests.
Every vial is batch-numbered.
Each label carries a printed batch ID, a QR code to the lab's lookup page and a research-use line.
Certificates of Analysis
What does a Certificate of Analysis from Excalibur Peptides show?
A current Certificate of Analysis (COA) from Excalibur Peptides is the lab's own report on one product, and it shows six things.
How our COAs workCompound and lot
The compound name and the lot field, as the lab recorded the sample.
Purity by HPLC
The purity result, shown with the HPLC chromatogram.
Identity by LC-MS
The mass confirmation, with the molecular mass the lab measured.
Net content
The amount of compound the lab measured in the tested sample, in mg.
Laboratory and dates
Freedom Diagnostics Testing as the laboratory, Excalibur Peptides as the client, and the received and reported dates.
Search code
The code that looks the report up on the lab's own site, outside ours.
How do I look up a report?
Open the lab's lookup page.
Scan the QR code on a vial label, or go to Freedom Diagnostics Testing's COA lookup page.
Search the lab's records.
Search "Excalibur Peptides", or enter the search code printed on a report. No account is needed.
Or open the COA database.
Signed-in research customers can open every report there, and the account is free.
Quality
What does the testing cover?
Every current Excalibur Peptides report covers purity by HPLC and identity by LC-MS. Each product has one current report, issued for a sample the lab tested; it is not matched to individual batches or orders.
HPLC purity
HPLC separates the components of a sample, and the purity result is the main peak's share of all detected peaks. It does not measure the total content of the vial or detect water, salts or excipients.
LC-MS identity
LC-MS measures molecular mass, and identity is confirmed when the measured mass matches the mass calculated from the structure. Some previous reports from earlier batches use FTIR, which compares the sample's infrared spectrum with that of a known standard.
Fresh batches, frozen
Every product is made in fresh batches, then frozen and held at −10 °F until the day it ships.
Tracked U.S. shipping
Orders placed before 2 PM EST on a business day ship the same day, by USPS Priority Mail with tracking. Vacuum-sealed vials are packed in bubble wrap. Delivery within the U.S. typically takes 2–4 business days.
Where does Excalibur Peptides ship, and what does it cost?
Excalibur Peptides ships every order by USPS Priority Mail with tracking to addresses in all 50 U.S. states, for a flat $10 or free on orders of $150 or more.
- Orders placed after the 2 PM EST cutoff, on Sundays or on federal holidays ship the next business day. Business days are Monday through Saturday, excluding federal holidays.
- A tracking number is emailed when the order ships.
- International shipping is not offered, and there is no minimum order.
- All sales are final. Damaged or incorrect orders are replaced at no charge when reported with photos within 7 days of delivery.
Read the full Shipping Policy and Refund Policy.
Research accounts
Who can buy from Excalibur Peptides?
Buyers aged 21 or older with a free research account can buy from Excalibur Peptides, for in-vitro laboratory research use only.
- A research account is free: sign up with an email address and password, or continue with Google or Apple.
- Signed in, a research customer sees the catalog, prices and the full COA database, and can check out. Guest checkout is not available.
- The account asks you to accept the research-use agreement once, and checkout asks you to certify research-use-only status.
Reviews
What is the Excalibur Peptides rating on Trustpilot?
TrustScore 4.6 out of 5 from 30 reviews on Trustpilot, as of November 10, 2026.
How do I contact Excalibur Peptides?
Excalibur Peptides is contacted by email at info@excaliburpeptides.com. Support is handled by email, for order support and COA questions.
Frequently asked questions
More questions? Contact us.
What does Excalibur Peptides sell?
Lyophilized research peptides and research compounds for in-vitro laboratory use, each supplied as a powder in a sealed, labeled glass vial. The catalog is open to signed-in research customers (a free account, 21+, with the research-use agreement on file): each product page lists the vial size, storage, research information, pricing and the product's COA.
Is Excalibur Peptides a legitimate company?
You can check the key facts yourself. Excalibur Peptides is a U.S.-based research peptide supplier. Every product is third-party tested by a named independent laboratory, Freedom Diagnostics Testing, and each Certificate of Analysis carries the code to look the report up on that lab's own site. Each vial label carries a printed batch ID and a QR code, customer reviews are published on Trustpilot, and products are sold only to buyers 21 and older for in-vitro laboratory research use.
Where is Excalibur Peptides located?
Excalibur Peptides is a U.S.-based research peptide supplier. Orders placed before 2 PM EST on a business day ship the same day, to addresses within the United States only.
Do I need an account to see the catalog and prices?
Yes. The catalog, product pages, pricing, the cart and checkout are available to signed-in research customers. Creating an account is free: sign up with an email address and password, or continue with Google or Apple, and accept the research-use agreement once. Company information, the third-party testing overview and the store policies are public.
What is the research-use agreement?
Each account accepts the research-use agreement once: the account holder confirms being 21 or older and buying for in-vitro laboratory research use only, not for human or animal consumption, and selects a field of research. The date and time of acceptance are recorded on the account. The catalog, pricing and ordering open once it is accepted, and the research-use certification at checkout still applies to every order.
What payment methods does Excalibur Peptides accept?
We accept credit and debit cards, Apple Pay, Venmo and Cash App.
How do I choose a research peptide supplier?
A third-party Certificate of Analysis for the specific product that names the testing laboratory and reports purity by HPLC and identity by a method such as LC-MS or FTIR; a way to look the report up with the lab; stated storage and shipping practices; clear research-use-only terms; and a contact address. Excalibur Peptides provides each of these to signed-in research customers on its product pages and in its COA database.
What does "research use only" mean?
"For in-vitro laboratory research use only" means the compound is sold strictly for non-clinical scientific study in laboratory environments. Not approved by the FDA for human or veterinary use. It is not intended for human or animal consumption or any therapeutic application.
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