How polyphenols are measured

Two methods. Very different numbers.

The same olive oil can read one number by one method and nearly triple by another — here's why, and which one we trust.

The evidence, side by side

Measured, not estimated.

The identical high-phenolic olive oil, measured two ways — and labeled for what each number is actually worth.

HPLCThe gold standard

Separates and measures each polyphenol directly — the only method recognized by the International Olive Council (COI/T.20/Doc.29).

635 mg/kg

2025 harvest, confirmed by two accredited labs within 4%: 635 mg/kg (Modern Olives, July 2026) and 612 mg/kg (PharmaGnose, February 2026).

NMRA predictive estimate

Infers a total from spectra instead of measuring compounds. Not recognized by the IOC, and can read 2–3× higher.

1,713 mg/kg

Our 2024 harvest by NMR at the grove (November 2024). The same harvest read 735 mg/kg by HPLC six months later. Same oil, different math.

2024 harvest · same scale

HPLC · measured
735 mg/kg
HPLC · May 2025
NMR · estimated
1,713 mg/kg · Nov 2024

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Pomoni High-Phenolic Olive Oil
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Pomoni High-Phenolic Olive Oil

Early-harvest Greek extra virgin olive oil, tested by HPLC every batch. Pour it, cook with it, and read the lab report behind it.

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Why we lead with HPLC

The conservative number, every time.

A polyphenol figure is only as trustworthy as the method behind it. Here is why we build our label on HPLC — and publish NMR only for comparison.

01

It measures compounds directly

HPLC physically separates and quantifies each polyphenol — hydroxytyrosol, tyrosol, oleocanthal, oleacein — so the number reflects molecules actually in the bottle.

02

It's the recognized method

The International Olive Council recognizes HPLC (COI/T.20/Doc.29) as the official method for measuring olive-oil biophenols — the standard accredited labs follow.

03

NMR is predictive

NMR infers totals from spectra and can read 2–3× higher for the same oil. It is useful for research — not for a number you put on a label.

04

So we publish both — and lead with the verified one

Transparency means showing the conservative, accredited number rather than the flattering one. We report NMR alongside — but our promise is the HPLC figure.

Phenolia Daily
The daily habit

Phenolia Daily

High-phenolic olive oil, olive leaf and Greek Mountain Tea in one plant-based capsule: 12 mg olive polyphenols per two-capsule serving, with the lab report published.

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An analogy

Like Manuka honey's MGO rating.

Serious Manuka honey is graded by MGO — the actual compound measured — not a vague “activity” score, because buyers learned to trust the specific number over the marketing one.

High-phenolic olive oil is the same: ask for the HPLC number, by the IOC method, from an accredited lab.

THE NUMBER YOU CAN TRUST

Proof you can read yourself.

Phenolia Daily is built on the HPLC number — the conservative, accredited figure — with every batch certificate published for you to read. Three Greek polyphenol sources, no oil to sip, zero calories.

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