Certificate of Analysis · Lot release · Issued for Epic Wholesalers LLC -dba-Epic Peptides Lab
Retatrutide 5 mg
Lot PL-2610-166 · Lyophilized powder · Label claim 5 mg per vial
Tested in-house by PrymaLab
In-house analytical result, not an independent third-party test
Lot / batch number
PL-2610-166
Date made
2026-10-06
Date of analysis
2026-10-07
Date issued
2026-10-21
Retest / expiry
2028-10-06
Units in lot / sampled
359 / 2
Storage
−20 °C, desiccated, dark
Certificate type
Lot COA, 2 pages
Compound
Retatrutide
CAS number
2381089-83-2
Molecular formula
C221H342N46O68
Theoretical mass (avg.)
4,731.33 Da
Sequence
acylated tri-agonist
Purity · RP-HPLC, area %
99.29%
Specification ≥ 99.0% • main peak at 18.47 min
Identity · Observed Mass
4,731.56 Da
Theoretical 4,731.33 Da • +0.23 Da (49 ppm)
Overall conclusion
PASS
Meets every specification for the tests performed
Test
Method
Specification
Result
Conclusion
Identity (mass)
LC-MS, ESI positive
Theoretical ± 1.0 Da
4,731.56 Da
PASS
Purity
RP-HPLC, UV 214 nm, area%
≥ 99.0%
99.29%
PASS
Largest impurity
RP-HPLC, area%
≤ 1.0%
0.33% (RT 17.80)
PASS
Water content
Karl Fischer
≤ 5.0%
1.51%
PASS
Bacterial endotoxin
LAL, kinetic
≤ 5.0 EU/mg
0.144 EU/mg
PASS
Sterility
USP <71>, 14-day
No growth
No growth
PASS
1HPLC chromatogram
Data file: PL-2610-166-HPLC.raw · Column C18, 150 × 4.6 mm · UV 214 nm
Peak plot drawn from the integrated peak table (area %, log scale); it is not the instrument trace, which is retained in PL-2610-166-HPLC.raw. † Nominal reference retention time for the assigned impurity; the main-peak RT is observed in this lot.
Epic Wholesalers LLC -dba-Epic Peptides Lab
Certificate of Analysis · continued
Retatrutide 5 mg · Lot PL-2610-166 · Certificate PL-26-00279
Lot PL-2610-166
Method, peak table and approval
2HPLC method · PL-2610-166-HPLC.raw
Instrument
Waters Alliance e2695
Data System
Empower 3
Detector
UV absorbance
Detection Wavelength
214 nm
Column
C18, 150 × 4.6 mm, 3.5 µm
Mobile Phase A
0.1% TFA in water
Mobile Phase B
0.1% TFA in MeCN
Gradient
5–95% B over 25 min (linear)
Flow Rate
1.0 mL/min
Column Temperature
40 °C
Injection Volume
10 µL
3Gradient program
Time (min)
% A
% B
0.0
95
5
25.0
5
95
4Peak table
Peak
RT (min)
Area
Area %
1
17.00 †
—
0.18
2
17.80 †
—
0.33
3
18.47
—
99.29
4
19.60 †
—
0.20
Total
—
100.00
Peaks: 1 deamidation product; 2 isoaspartate (isoasp) variant; 3 main peak (Retatrutide); 4 tryptophan oxidation product · Area % from the integrated peak table (absolute areas are not part of the lot-release export) · † nominal reference RT for the assigned impurity · Purity = main peak area ÷ total integrated area × 100, to two decimals; main peak shaded.
5Identity by mass spectrometry
Instrument
Waters SQD
Ionization / Mode
ESI, positive
Reference m/z (charge)
1183.84 (4+) · 947.27 (5+)
Deconvoluted Mass
4,731.56 Da
Theoretical Mass
4,731.33 Da
Difference
+0.23 Da (49 ppm)
Data File
PL-2610-166-MS.d
Acceptance
Within ± 1.0 Da
6Additional tests
Test
Performed by
Date
Report / file
Water content (Karl Fischer)
PrymaLab Analytical
2026-10-07
—
Endotoxin (LAL, kinetic)
PrymaLab Analytical
2026-10-07
—
Sterility (USP <71>, day-14 read-out)
PrymaLab Analytical
2026-10-21
—
A test with no row here was not performed on this lot. Outside-laboratory reports, when used, are attached and named below.
7Review and approval
D. Reynolds Analyst · performed the testing Date: 2026-10-21
S. Calloway Reviewer · checked against raw data Date: 2026-10-21
M. Phelps Lab Director · approved for release Date: 2026-10-21
