MasWorth is a family business, dedicated to offer the best high polyphenol olive oil in the UK market.
Our two flagship products, November Polyphenols Olive Oil and MasWorth Family Groves Extra Virgin Olive Oil, belong to a special category of lab-certified high phenolic olive oils. These are also known as health claim category oils, because they meet the EU Health Claim (432/2012) for antioxidant protection and associated health benefits.
NOVEMBER POLYPHENOLS EVOO
High Phenolic Organic Extra Virgin Olive Oil
Buy November Olive Oil – Lab-certified +1200 mg/kg polyphenols, offering exceptional health value.
New Harvest October/November 2025
MasWorth Family Groves Extra Virgin Olive Oil
High Polyphenol EVOO – Lab-certified 965 mg/kg polyphenols, offering exceptional health value and balanced flavour.
New Harvest November 2025
Only trust High Polyphenols Olive Oils with Lab Analysis Certificates.
The Lab Certificates of our oils NOVEMBER POLYPHENOLS and MASWORTH EVOO can be found below
Complete Transparency, Lab-Certified
We believe in proof, not promises. Every harvest is independently lab-tested and certified by specialised labs, ensuring full transparency and verified quality.
Documented Polyphenol Levels: Over 1200 mg/kg of polyphenols reported for NOVEMBER POLYPHENOLS olive oil of Oct/Nov 2025 Harvest — measured and certified.
Click here to view Certificate.
Complete Transparency,Lab-Certified
We believe in proof, not promises. Every harvest is independently lab-tested and certified by specialised labs, ensuring full transparency and verified quality.
Documented Polyphenol Levels: Over 960 mg/kg of polyphenols reported for MasWorth olive oil of November 2025 harvest — measured and certified.
Click here to view Certificate.
Real love, from people,
who've seen a real difference.
‘Health & Polyphenols’
“What impressed me most about this olive oil is the transparency and the very high polyphenol levels. The fact that it is lab-certified and that you can verify the analysis gives great confidence. It’s rare to find an olive oil that combines exceptional taste with scientifically recognized health benefits. I will definitely continue buying it.”
‘Authenticity & Family Production’
“You can tell this is a product made with care. Knowing it comes from a family-owned olive grove withgenerations of experience makes a big difference. The oil tastes vibrant and fresh, and the quality is clearlysuperior to supermarket olive oils. It feels like a truly authentic Mediterranean product.”
‘Customer Experience & Service’
“Excellent product and excellent service. The olive oil arrived quickly and was very well packaged. Theteam was also extremely helpful in explaining the characteristics of high-polyphenol olive oil and how tobest enjoy it. It’s refreshing to buy from a company that cares about both quality and customer experience.”
‘Health & Polyphenols’
“What impressed me most about this olive oil is the transparency and the very high polyphenol levels. The fact that it is lab-certified and that you can verify the analysis gives great confidence. It’s rare to find an olive oil that combines exceptional taste with scientifically recognized health benefits. I will definitely continue buying it.”
Published research on Olive Oil polyphenols
Explore peer-reviewed research
investigating olive oil polyphenols across a range of biological and
health-related topics. These research topics are provided for scientific
information only (not authorised UK or EU health claims)
Tradition, Science, and Sustainability
At MasWorth, we honor the tradition of ancient extra virgin olive oil farming practices while using modern testing to prove quality. Our oils go through independent labs, which confirm polyphenol levels and certify compliance with health claims.
Why Choose MasWorth Olive Oil?
High Polyphenol Extra Virgin Olive Oil for proven health benefits
Cold Pressed Olive Oil that preserves nutrients naturally
Sustainable Farming with full traceability
Award-Winning EVOOs like November Polyphenols and MasWorth Family Groves
These qualities make us the trusted olive oil extra virgin shop in the UK.
Recognized for Quality
Our November Oil is internationally acclaimed for its antioxidant power and smooth flavor. Customers seeking the best olive oil know it offers both health and taste.
Meanwhile, MasWorth Virgin Olive Oil provides freshness and balance for daily cooking. Together, they deliver options for every kitchen — from gourmet chefs to health-conscious families.
Serving Health-Conscious Consumers
Consumers today demand more than generic olive oil. They want polyphenols olive oil with real nutritional value. MasWorth provides exactly that. Whether you need the best olive oil to drink daily, a finishing touch for meals, or a thoughtful gift, our oils are the perfect choice.
With every harvest, MasWorth proves that cold pressed extra virgin olive oil can deliver world-class quality. We combine tradition, sustainability, and scientific proof to create oils that support both wellness and taste.
Frequently asked questions
A High Polyphenol Olive Oil is an extra virgin olive oil that contains unusually high levels of naturally occurring antioxidants called polyphenols. These compounds are linked to heart health, reduced inflammation, longevity, and protection of blood lipids from oxidative stress. Because November Olive Oil contains over 1,200 mg/kg polyphenols, it far exceeds the minimum EU threshold for the official health claim olive oil classification.
November Olive Oils and MasWorth Olive Oils are filtered. The filtering process helps olive oil to maintain stability and preserve their healthy qualities and polyphenols. Unfiltered olive oils include olive particles that will continue to ferment in the bottle and the sediment on the bottom of the bottle will accelerate the oxidation, thus negatively affecting the quality of the olive oil.
Thanks to its extraordinary polyphenol content (above 1200 mg/kg), this oil is rich in antioxidants that support: Heart health - Reduction of inflammation - Protection of blood lipids from oxidative stress (as recognised by the official EU Health Claim 432/2012) Enjoying just 20 g (1–2 tablespoons) daily can help you benefit from these protective effects.
November Polyphenols Olive Oil belongs to a rare category of High Polyphenol Olive Oils (also called High Phenolic Olive Oils, Medical Grade Olive Oils, or Health Claim Olive Oils). What makes it truly unique is its lab-certified polyphenol content of +1200 mg/kg in the October–November 2025 harvest, its 100% organic certified cultivation and traditional farming processes. November olive oil is placed among the highest olive oil quality in the world, delivering exceptional antioxidant and health benefits alongside a vibrant, peppery taste.
Thanks to its extraordinary polyphenol content (above 1200 mg/kg), this oil is rich in antioxidants that support: Heart health - Reduction of inflammation - Protection of blood lipids from oxidative stress (as recognised by the official EU Health Claim 432/2012) Enjoying just 20 g (1–2 tablespoons) daily can help you benefit from these protective effects.