About Xcel Peptides
A U.S.-based supplier of research materials for qualified researchers and laboratories. We built Xcel around one idea: a purity number should come with the method behind it.
Xcel is spelled with an X. If you searched for Excel Peptides or Xcelpeptides, you are in the right place.
Who we are
Xcel Peptides is a trade name of Xcel Research LLC. We supply research materials to qualified researchers and licensed laboratories, and every order goes through a free researcher account.
Who we sell to
Our customers are independent researchers, research institutions, analytical laboratories and similar qualified buyers. Every registered buyer confirms a research purpose at checkout. We do not sell to the general public, and we may decline or cancel an order if a buyer does not fit that description.
How we document quality
We use independent third-party laboratories to test the materials we supply. The laboratories sit outside Xcel, so the people selling the material are not the people reporting on it.
What the tests measure
Identity
Identity testing, such as mass spectrometry or NMR, checks that a material is what it is labeled as.
Purity
HPLC (liquid chromatography) separates a sample and reports how much of the detected material is the main component.
Composition
Content testing estimates how much of the vial content is the compound itself rather than water or salts.
Which tests apply depends on the material. Where a purity method does not apply to a material, such as some non-peptide materials and mixtures, no purity figure is reported for it.
How a tested batch is documented
A complete test file for a research material should answer five questions. Use them to read a test file from any supplier.
Which method was used, and on what instrument?
Which batch does the file cover, and on what date was it tested?
Was identity addressed by a named method?
Where a purity method applies, was purity reported by a named method?
Was content measured separately from purity?
Company details
Company
Xcel Research LLC. Xcel Peptides is its trade name.
Mailing address
1309 Coffeen Avenue, Suite 12238
Sheridan, Wyoming 82801
Documentation
Test documentation for the materials you order is available to registered researchers. We do not publish individual laboratory reports on public pages.
Research use only
Everything we supply is for laboratory research only and is not for human consumption. We do not provide guidance on use. Our public pages cover testing, chemistry, storage and stability.