Tirzepatide 15mg lab results from Vanguard Laboratory

Independent certificate of analysis for Snowman Research Tirzepatide 15mg, lot TR15306263A. Sold for laboratory research use only. Not for human or veterinary use. Nothing on this page is medical, dosing, or use advice.

A sample from our Tirzepatide 15mg lot was tested by Vanguard Laboratory in Olympia, Washington. The certificate of analysis (laboratory ID V261109-5 001) was reported on November 11, 2026. The full PDF is posted below, and the same results appear on the Tirzepatide 15mg product page and in our lab results list.

This certificate can be confirmed on Verified by Vanguard: Verify on Verified by Vanguard.

Lot TR15306263A

The lot number on the certificate is TR15306263A. Our lot codes follow a fixed pattern: TR15 (product code), 306 (day of the year), 26 (year), 3 (vial number), and A (vendor letter).

What the lab measured

Vanguard used HPLC with UV/VIS detection for identity, purity, and quantity, and a separate solubility check in water. In plain terms, here is what each line on the report means, using only the figures the lab recorded.

Identity: retention time

High-performance liquid chromatography (HPLC) measures how long a compound takes to move through the lab’s column (its retention time) and compares that time with a reference standard of the same compound. Vanguard reported this check as Pass – Matches Ref. Standard.

Identity: spectral analysis

The same HPLC-UV/VIS run also records the ultraviolet/visible absorbance spectrum of the peak and compares it with the reference standard. Vanguard reported this check as Pass – Matches Ref. Standard.

Chromatographic purity

Chromatographic purity is the area of the main peak as a share of the peaks the method can see, reported as an area percentage. It is not the same thing as an absolute mass-purity figure. Vanguard reported chromatographic purity of >99.80%.

Quantity

Quantity is the amount of the intended compound the lab measured in the portion it tested. Vanguard reported 14.06 mg, compared with the 15 mg label (about 93.7% of the labeled amount).

Solubility in water

The lab also checked whether the sample dissolved in water. Vanguard reported this check as Pass.

The certificate

Testing lab: Vanguard Laboratory, Olympia, WA
Laboratory ID: V261109-5 001
Lot number: TR15306263A
Date reported: November 11, 2026
Report by: Dustin Newman, Laboratory Director, 11/11/2026
Approved by: Tori Johnson, Operations Director, 11/11/2026
Accreditation reference: A2LA Certificate #6377.01

View the full Vanguard certificate of analysis (PDF) · Verify on Verified by Vanguard

What the lab asks readers to keep in mind

Vanguard states that the results in the report relate only to the portion of the sample tested, and that the laboratory did not observe or participate in the sample selection process and cannot confirm the authenticity of the sample or its representativeness of the associated lot or batch. The lab also notes that chromatographic (blend) purity is the combined chromatographic area percentage of peaks identified as the intended components, not absolute mass purity, and that co-eluting or otherwise undetected impurities may not be included.

Please consult A2LA Certificate #6377.01 for a list of accredited tests. Samples were received in acceptable condition. All analyses were performed consistent with the Vanguard Laboratory Quality Management System.

Snowman Research sells this material for laboratory research use only. It is not a medicine, not FDA-approved, and not for human or veterinary use. See the research-use policy.