What Is Retatrutide Purity?
Retatrutide purity refers to the proportion of the target peptide (Retatrutide, a 39-amino acid GLP-1/GIP/Glucagon triple agonist) relative to all other substances present in a sample, expressed as a percentage. Impurities in a peptide batch can include truncated sequences, deletion peptides, oxidised variants, and synthesis by-products.
Purity is the primary quality metric for evaluating a Retatrutide batch. A COA that does not include a purity percentage from RP-HPLC analysis should be treated with caution.
How Is Retatrutide Purity Measured?
Reversed-phase high-performance liquid chromatography (RP-HPLC) is the standard analytical method for peptide purity determination. In RP-HPLC, the peptide sample is injected onto a C18 column and eluted with an acetonitrile/water gradient. The detector (typically UV at 214nm or 220nm) records the absorbance of each eluting component, producing a chromatogram.
Purity is calculated as the area percentage of the main Retatrutide peak relative to the total integrated peak area. A purity of ≥98% means that at least 98% of the UV-absorbing material in the sample is the target Retatrutide peptide.
ShiLai™ Healthcare Purity Standards
| Parameter | ShiLai™ Standard |
|---|---|
| Purity method | RP-HPLC (C18 column, UV 214nm) |
| Standard purity specification | ≥98% by RP-HPLC |
| Identity confirmation | LC-MS (observed mass matches theoretical) |
| Testing frequency | Every batch before release |
| Documentation | Full chromatogram + peak integration table in COA |
| Batch traceability | Unique batch number on COA, label, and shipping docs |
How to Interpret a Retatrutide Purity COA
Check the purity percentage
The COA should state a purity percentage from RP-HPLC analysis. ≥98% is the standard for research-grade Retatrutide. Values below 95% indicate significant impurity levels.
Verify the batch number
The batch number on the COA must match the batch number on the product label. A COA without a matching batch number cannot be verified.
Review the chromatogram
A legitimate COA includes the full RP-HPLC chromatogram, not just a purity number. The chromatogram should show a dominant main peak with minor impurity peaks.
Confirm LC-MS identity
Purity alone does not confirm identity. The COA should also include LC-MS data confirming the observed molecular mass matches the theoretical mass of Retatrutide.
Request a Sample Retatrutide COA
Contact ShiLai™ Healthcare to request a sample COA including RP-HPLC purity data and LC-MS identity confirmation.
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