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Sourcing · May 28, 2026 · 6 min read

Why Cold-Pressed Actually Matters

Heat is the fastest way to ruin a good oil. Here's what happens inside the press — and how to read a label like a producer.

Why Cold-Pressed Actually Matters

Walk down any supermarket oil aisle and nearly every bottle says something reassuring: pure, natural, classic. Almost none of it tells you the thing that matters most — how the oil was extracted.

Industrial extraction uses heat and solvents to pull every last drop from the fruit or seed. It's efficient, and it's also why most oil tastes like nothing. Heat above roughly 27°C starts breaking down polyphenols, the antioxidant compounds responsible for both flavor and most of olive oil's documented health benefits.

Cold pressing is slower and wasteful by industrial standards — a cold press leaves oil behind in the paste. But what comes out is intact: peppery, grassy, slightly bitter in the way that signals high polyphenol content. That throat-tickle when you taste a great olive oil? That's oleocanthal, an anti-inflammatory compound. No tickle usually means it's gone.

When you're buying, look for three things: a harvest date (not just a best-before date), a named estate or mill, and a dark glass bottle. Oil is alive, and light, heat, and time are its enemies. A great oil from two harvests ago is no longer a great oil.

Everything we stock at Kinso is pressed within hours of harvest and shipped in dark glass. We print the harvest date on every bottle because we think you deserve to know — and because our producers are proud of it.