Claims vs COA / RetaPeptide

RetaPeptide: claims vs COA

Website claim: 99% purity. “…ore What is Peptide Purity? we provide peptides that exceed 99% purity. Using state-of-the-art solution and solid phase peptide sy…” Source (read 2026-09-25)

certificates read

13 / 15

vials outside ±3% of label

beyond ±10% (major)

1 / 31

below advertised purity

Product	Label → measured	Purity	Main impurity	Lab	COA
BPC 157 10mg+GHK-CU 50mg+TB500 10mg	GHK-Cu: 50mg → 60.05mg Overfilled +20.1% TB-500 (TB4): 10mg → 0.84mg Not checked BPC-157: 10mg → 12.31mg Overfilled +23.1%	—	—	janoshik	Open
BPC5mg+TB5mg Blend	BPC-157: 5mg → 5.76mg Overfilled +15.2% TB-500 (TB4): 5mg → 5.65mg Overfilled +13.0%	—	—	janoshik	Open
NAD+ 500mg	500mg → 706.83mg Overfilled +41.4%	—	—	janoshik	Open
Retatrutide 10mg	10mg → 11.01mg Overfilled +10.1%	99.657% Meets 99%	0.34% not itemised	janoshik	Open
Retatrutide 30mg	30mg → 35.73mg Overfilled +19.1%	99.859% Meets 99%	0.14% not itemised	—	Open
Semaglutide 10mg	10mg → 11.03mg Overfilled +10.3%	99.591% Meets 99%	0.41% not itemised	—	Open
Tirzepatide 30mg	30mg → 34.38mg Overfilled +14.6%	99.784% Meets 99%	0.22% not itemised	janoshik	Open
CJC-1295 with DAC 5	— → 5.32mg Not checked	98.277% 0.72 pts below 99%	1.72% not itemised	—	Open
Cagrilintide 10mg	10mg → 10.6mg Over label +6.0%	99.656% Meets 99%	0.34% not itemised	janoshik	Open
Retatrutide 10 mg	10mg → 10.7mg Over label +7.0%	99.579% Meets 99%	0.42% not itemised	—	Open
Semaglutide 10 mg	10mg → 10.67mg Over label +6.7%	99.765% Meets 99%	0.23% not itemised	—	Open
Tirzepatide 10mg	10mg → 10.81mg Over label +8.1%	99.541% Meets 99%	0.46% not itemised	janoshik	Open
Tirzepatide 30mg	30mg → 32.28mg Over label +7.6%	99.814% Meets 99%	0.19% not itemised	—	Open
Tirzepatide 60mg	60mg → 64.2mg Over label +7.0%	99.866% Meets 99%	0.13% not itemised	—	Open
BPC-157	— → 10.48mg Not checked	99.961% Meets 99%	0.04% not itemised	—	Open
BPC-157	— → 9.84mg Not checked	99.76% Meets 99%	0.24% not itemised	—	Open
CJC-1295 with DAC	— → 5.14mg Not checked	99.258% Meets 99%	0.74% not itemised	—	Open
Cagrilintide	— → 10.55mg Not checked	99.344% Meets 99%	0.66% not itemised	—	Open
GHK-CU	Not measured	99.021% Meets 99%	0.98% not itemised	—	Open
MOTS-C	— → 9.94mg Not checked	99.384% Meets 99%	0.62% not itemised	—	Open
NAD+500	— → 684.48mg Not checked	—	—	janoshik	Open
Retatrutide	— → 21.99mg Not checked	99.531% Meets 99%	0.47% not itemised	—	Open
Retatrutide	— → 31.61mg Not checked	99.478% Meets 99%	0.52% not itemised	—	Open
Semaglutide	— → 10.12mg Not checked	99.624% Meets 99%	0.38% not itemised	—	Open
Sermorelin	— → 10.09mg Not checked	99.661% Meets 99%	0.34% not itemised	—	Open
Sermorelin	— → 9.93mg Not checked	99.012% Meets 99%	0.99% not itemised	—	Open
TB500	— → 10.72mg Not checked	99.805% Meets 99%	0.19% not itemised	—	Open
TB500	— → 10.49mg Not checked	99.439% Meets 99%	0.56% not itemised	—	Open
Tesamorelin	— → 9.27mg Not checked	99.839% Meets 99%	0.16% not itemised	—	Open
Tesamorelin	— → 10.43mg Not checked	99.044% Meets 99%	0.96% not itemised	—	Open
Tesamorelin	— → 10.12mg Not checked	99.627% Meets 99%	0.37% not itemised	janoshik	Open
Tesamorelin 10mg	10mg → 10.04mg On label +0.4%	99.076% Meets 99%	0.92% not itemised	janoshik	Open
Tirzepatide	— → 33.16mg Not checked	99.881% Meets 99%	0.12% not itemised	—	Open
Tirzepatide	— → 33.12mg Not checked	99.864% Meets 99%	0.14% not itemised	—	Open
Tirzepatide 60mg	60mg → 61.59mg On label +2.7%	99.787% Meets 99%	0.21% not itemised	janoshik	Open

How this is checked

Vial content. Measured net peptide content against the size on the label. Within ±3% is on label, 3–10% is off label, beyond ±10% is a major deviation (under- or overfilled). When a certificate weighs several vials of the batch, the vial farthest from the label is the one judged, and with several purity results the lowest counts. Blends are only checked when the certificate lists each component.
Purity. HPLC purity on each certificate against the purity the supplier promises site-wide on its own website. Up to 1 point below the claim is amber, more than that is red. Only a direct promise counts (“99%+ purity guaranteed”); explanations of what purity means, one product's figure and page code are not treated as a claim. A certificate that reports only a bound (“>99%”) is judged only when the bound meets the claim, and a specification line is never read as a result.
Whose certificate. A certificate is only read once our client-identity review has looked at it, and one issued to a different company is left out — whether the automatic check or a manual review found it. A certificate issued to the company that runs the supplier's own website counts as the supplier's. A file hosted on another supplier's website is not counted for this one. The same rules decide which certificates appear on supplier and product pages. Only peptide certificates are read: bacteriostatic water, acetic acid and other diluents are left out, and so are product data sheets, which state a specification rather than a batch result.
Main impurity. Shown when the certificate itemises it: a named impurity (TFA, deletion sequence, oxidation…) or the largest secondary peak in the HPLC peak table. Most certificates report only a purity figure, so the rest of the sample is not itemised.
Trust Score. These checks are 10 of the 25 Transparency points: vial content 7 (full credit within ±3%, half up to ±10%, none beyond, over- and underfilled alike), purity 3 (98% is the bar when a supplier advertises no figure). Fewer than 5 readable results gives half credit rather than a guess.
These are the supplier's own published certificates, read automatically from the PDF or image. Janoshik results tables are read twice from the image, cell by cell, and a figure the two readings disagree on is left out rather than guessed. A certificate covers one batch on one date. We have not tested these batches ourselves.

RetaPeptide supplier page