What Is RSO Oil & FECO? (Rick Simpson Oil & Full Extract Cannabis Oil – UK Guide 2026)
Educational content only • Updated July 20, 2026
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Fresh July 2026 batch shown – dated for clarity and peace of mind.
Rick Simpson Oil (RSO) and FECO (Full Extract Cannabis Oil) are highly concentrated, full-spectrum cannabis extracts containing very high levels of THC (typically 60–90%). RSO was popularized by Rick Simpson, while FECO is the broader term commonly used in the UK.
In 2026, searches for "what is rso oil", "rso oil uk", "feco uk" and "rso vs feco" continue to grow. This page gives a clear educational overview of what these products are, how they differ from CBD, and the current legal situation in the United Kingdom.
Important: RSO and FECO are not approved medical treatments in the UK. They are Class B controlled substances and may only be legally accessed through a specialist medical cannabis prescription.
History of Rick Simpson Oil
Rick Simpson developed RSO in 2003 after a personal health challenge. He created a concentrated cannabis oil using a simple solvent extraction method and shared it freely online. His story sparked worldwide interest in high-potency full-spectrum extracts.
What Is FECO? (Full Extract Cannabis Oil in the UK)
FECO stands for Full Extract Cannabis Oil. It is the general term for highly concentrated cannabis extracts that retain the full range of cannabinoids and terpenes. In the UK, searches for "feco oil uk" usually refer to the same thick, dark, high-THC oil as RSO.
RSO vs FECO vs CBD – Key Differences
RSO is a specific type of FECO made using Rick Simpson’s method. Both are full-spectrum and very high in THC. CBD oil is completely different — hemp-derived, almost no THC, non-psychoactive, and legally sold over the counter.
How RSO or FECO Is Made
Traditional RSO and FECO are made by soaking dried cannabis flowers in food-grade solvent (usually isopropyl alcohol), then carefully evaporating the solvent to leave a thick, sticky oil. Home production is illegal in the UK.
RSO THC Percentage & Potency
Authentic RSO and most FECO typically contain 60–90% THC, making them among the strongest cannabis extracts available.
RSO / FECO vs CBD Oil – Quick Comparison
| Feature | RSO / FECO | CBD Oil |
|---|---|---|
| THC Content | Very High (60–90%) | Negligible (<0.2%) |
| Psychoactive? | Yes | No |
| UK Legal Status | Prescription only (Class B) | Over-the-counter |
| Common Use | Anecdotal wellness exploration | Relaxation, anxiety, sleep |
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Important Medical & Legal Disclaimer
This page is for educational purposes only and does not constitute medical advice. RSO and FECO are high-THC cannabis extracts and are not approved by the MHRA or NHS. Possession or use without a valid prescription is illegal in the UK. Always consult official sources and a qualified healthcare professional.