Tirzepatide — Certificate of Analysis

Lot TR10-2026-001 of GLP-2 TZ assayed at 99.88% peptide purity by RP-HPLC against a ≥95.0% release specification, 4.88 percentage points clear of it. Released 07/15/2026 by ILS Laboratories, ISO/IEC 17025 Accredited. Synthetic 39-residue dual GIP/GLP-1 receptor agonist peptide for in vitro metabolic signaling and incretin receptor research.

Net peptide content measured 10.41 mg against a 10 mg label — the mass of actual peptide in the vial, as distinct from salts, water and counter-ions. It is reported rather than graded, so it carries no pass/fail.

Full QC panel

Analyte	Specification	Result	Status
Peptide Purity (HPLC)	≥ 95.0%	99.88%	Pass
Identity (HPLC-RTM)	Tirzepatide Confirmed	Confirmed	Pass
Net Peptide Content	Report Only	10.41 mg	—
Fentanyl Screen	Immunoassay, 50 ng/mL cutoff	Not Detected	Pass

Sterility & endotoxin

Test	Specification	Result	Status
Sterility (PCR)	No Growth	No Growth	Pass
Endotoxin (USP <85>)	Report Result	NMT 0.05 EU/mL	Reported

Endotoxin is reported as a measured value rather than graded pass/fail: acceptable limits depend on route and matrix, and no universal threshold applies to research-use material. The laboratory reports the figure and leaves the judgement to you.

Elemental impurities

Panel	Method	Result	Status
Arsenic, cadmium, chromium, lead, mercury	ICP-MS, USP <233>	5 of 5 under limit	Pass

Per-element measurements are on the signed certificate below and in the laboratory's own record.

Reference data

Property	Value
Compound	Tirzepatide
Also known as	LY3298176, GIP/GLP-1 RA, Dual GIP/GLP-1 receptor agonist, LY-3298176
Sequence	Y-Aib-EGTFTSDYSIYLD-Aib-KIAQKAFVQWLIAGGPSSGAPPPS-NH2 (Lys20 conjugated to a C20 fatty diacid via linker; Aib at positions 2 and 13; C-terminal amide)
Molecular formula	C225H348N48O68
Molecular weight	4813.5 g/mol
CAS number	2023788-19-2
Physical form	Lyophilized powder
Storage	Store lyophilized powder at -20C; protect from light and moisture. Reconstituted solutions should be aliquoted and stored at -20C to -80C and used promptly. Avoid repeated freeze-thaw cycles.