Heat kills the good part

You can start with the best botanical on earth and waste it in the extraction.

Most plant ingredients are processed with heat. It’s faster, cheaper, and higher-yield. High temperatures pull more material out of a plant in less time, which suits industrial production. But the most valuable compounds in a botanical are often the most fragile: volatile aromatics, certain antioxidants, delicate fatty acids.

Heat is efficient at extraction and destructive to exactly the compounds that made the plant worth using.

Cold and slow is the opposite trade. Cold-pressing and low-temperature maceration take longer and pull less per batch -- but they leave the fragile compounds intact. The oil that comes out is closer to the plant it started as.

This is why two products can list the same botanical and contain something completely different. “Rosehip oil” extracted with heat and solvents is not the same material as rosehip oil cold-pressed slowly, even though the label reads identically.

The label can’t tell you which you’re getting. Extraction method is almost never disclosed.

The plant is only half the story. How you get the oil out is the other half. And it’s the half no one talks about.