Our Purity Standards
Our Number One Priority is Purity.
Wholesale pricing only matters if what's in the vial is right. Researchers running the same work week after week need consistent, verifiable material — so we treat purity as the product, and price as the bonus.
How we verify
Tested by someone other than the maker
Independent lab testing
Incoming stock is sent to independent third-party laboratories — not tested by the manufacturer that made it. Outside results are harder to fake and easier to trust.
HPLC purity analysis
High-performance liquid chromatography separates a sample into its components and measures what share of it is the target compound. It is the industry standard for reporting purity.
Mass spec identity check
Mass spectrometry measures molecular weight and confirms the compound in the vial is the compound on the label. Purity means nothing if the identity is wrong.
Published results
Certificates of analysis are posted to our COA Library as reports come back, so researchers can review the data themselves before ordering.
Handling
Purity is protected after testing too
Sealed lyophilized vials
Compounds are supplied freeze-dried in sealed vials, the most stable form for storage and transport.
Careful storage
Stock is kept cool, dry and away from light from the moment it arrives until it ships.
Inspected before dispatch
Every order is checked for seal integrity, correct labeling and the right pack size before it leaves.
Education
Common questions
Why not just trust supplier certificates?
Manufacturer-issued paperwork can be templated or reused. Independent testing removes the conflict of interest — the lab has no stake in the result.
What does the purity percentage mean?
It is the proportion of the sample that is the target compound, as measured by HPLC. The remainder is typically synthesis by-products or residual material.
Where can I see the reports?
All published certificates live in the COA Library. New reports are added as testing is completed.
Are these products for personal use?
No. All Purity Depot materials are sold strictly for laboratory and in-vitro research and are not for human or veterinary consumption.
See the data
Browse published certificates of analysis in our COA Library.
All products are supplied strictly for laboratory and in-vitro research use only. Not for human or veterinary consumption.