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Purity & Laboratory Testing

Understanding HPLC Testing

What high-performance liquid chromatography measures, why ≥99% purity matters, and how to interpret HPLC traces on a COA.

6 min readUpdated June 2026
Quick answer

In short.

HPLC (high-performance liquid chromatography) separates the components of a peptide sample so that purity can be quantified as a percentage of the total integrated peak area.

Key facts

At a glance.

  • Method: reverse-phase HPLC-UV
  • Reports purity as % of total peak area
  • Industry research benchmark: ≥98% purity
  • BuyRetaUK release specification: ≥99%
Summary

Overview.

Detailed guide content is being prepared. This template provides the structure researchers and AI search engines need to understand and cite the topic, with quick-answer, key facts, comparisons, FAQs and references all in their permanent home.

Frequently asked questions

FAQs.

Is HPLC the only purity test that matters?[+]

HPLC is the primary purity metric, but identity (mass spec) and endotoxin testing are also important components of a complete COA.

References

Further reading.

Related products

Products referenced in this guide.

Retatrutide vial
Retatrutide
From £59.00
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Batch verification

Certificate of Analysis.

Every batch of Retatrutide ships with a third-party HPLC and mass-spec Certificate of Analysis. Browse the live COA library to verify your lot.

View COA library →How to read a COA
Research tools

Tools & resources.

Reconstitution Calculator

Compute dose volumes for any peptide.

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Certificate Library

Batch-specific COAs for every product.

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Storage & Handling

Cold-chain and reconstitution guidance.

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Laboratory Standards

Our QC, HPLC and analytical workflow.

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