Understanding Peroxide Value in Botanical Oils

Peroxide value (PV) measures primary oxidation products in an oil. It is commonly used as an indicator of freshness and handling quality in botanical fixed oils, and most buyers set an upper limit in their incoming specification.

PV is dynamic. It changes with time, temperature, light exposure, and headspace oxygen. An oil measured at production may show a different value on arrival, and a different value again after months of storage. This is why the measurement date and storage history matter as much as the number itself.

A single peroxide value is a snapshot, not a verdict. Its meaning depends on when, and how, it was measured.

When reviewing a certificate of analysis, note the test method, the measurement date, and the batch identity. When setting your own incoming limit, consider the oil's journey — production, transit, and your own storage conditions before use.

For evaluation samples, we recommend measuring PV on receipt and again at the end of your evaluation window. The trend tells you more about the material's stability in your hands than any single figure can.