What Is RSO? Rick Simpson Oil Explained (2026 Guide)
What is RSO (Rick Simpson Oil)? RSO (Rick Simpson Oil) is a highly concentrated, full-spectrum cannabis oil originally developed by Rick Simpson in 2003. Unlike most cannabis extracts, RSO is typically consumed orally or applied topically rather than smoked or vaped.
RSO (Rick Simpson Oil) is a highly concentrated, full-spectrum cannabis oil originally developed by Rick Simpson in 2003. Unlike most cannabis extracts, RSO is typically consumed orally or applied topically rather than smoked or vaped. It contains the full range of cannabinoids, terpenes, and plant compounds from the cannabis plant, including high levels of THC (typically 60-90%). RSO is made using a solvent extraction process (traditionally naphtha or isopropyl alcohol) that strips all compounds from the plant material.
What Is RSO (Rick Simpson Oil)?
RSO: Quick Summary
RSO Key Facts
- Full-spectrum cannabis extract with 60-90% THC
- Consumed orally (under tongue or in food) or applied topically
- Named after Rick Simpson who popularized it for health purposes
- Dark, thick, tar-like consistency — usually dispensed in syringes
- Contains all cannabinoids including THC, CBD, CBN, CBC, and terpenes
- Different from CBD oil — RSO is high-THC and psychoactive
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What is RSO used for?
RSO is commonly used for chronic pain, sleep support, appetite stimulation, and general wellness. Some cancer patients use RSO as a complementary therapy, though clinical evidence is limited. RSO is consumed orally — typically a rice-grain-sized amount placed under the tongue or mixed into food. Due to its high THC content, RSO produces strong psychoactive effects.
How do you take RSO?
RSO is typically consumed orally. Place a small amount (start with a rice-grain-sized dose) under your tongue and hold for 60-90 seconds before swallowing. You can also mix it into food or drinks. RSO can be applied topically to the skin. Do NOT smoke or vape RSO — it is not designed for inhalation.
How is RSO different from regular cannabis oil?
RSO is a full-spectrum extract containing all cannabinoids and plant compounds, while many cannabis oils are made from isolated or distilled THC or CBD. RSO is typically much more potent and contains a broader range of active compounds. The full-spectrum nature is believed to produce an 'entourage effect' where compounds work together.
How much RSO should a beginner take?
Beginners should start with an extremely small amount — about half a grain of rice (roughly 10-25mg THC). Wait at least 2 hours before taking more. RSO is very potent. Most protocols recommend gradually increasing the dose over several weeks. Consult with a healthcare provider before starting RSO.
This article is for educational purposes only. Cannabis is for adults 21+. The Library is a licensed NJ cannabis dispensary (License RE000228). Visit us at 5 Washington Street, West Orange, NJ 07052.
Corey Dishman
Cannabis Educator & Content Specialist
The Library of New Jersey
Corey is a cannabis education specialist at The Library with 5+ years of experience helping customers navigate the New Jersey cannabis market. He creates engaging, accurate content about cannabis products, regulations, and wellness.
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Disclaimer: Cannabis products are for adults 21 and older only. Cannabis should be consumed responsibly. Do not drive or operate heavy machinery under the influence of cannabis. The effects of cannabis vary by individual. Start with a low dose and wait before consuming more. This content is for informational purposes only and does not constitute medical advice. The Library operates under NJ Cannabis Retail License RE000228. For questions about NJ cannabis regulations, visit the NJ Cannabis Regulatory Commission.