Ultimate Guide to RSO (Rick Simpson Oil) 2025

Introduction: What Is RSO?

Rick Simpson Oil, more commonly known as RSO, is one of the most widely recognized cannabis extracts in the world.

Named after Canadian engineer Rick Simpson, who popularized the oil after claiming it helped treat his skin cancer, RSO has become a staple in the medical cannabis conversation.

Unlike CBD oils, tinctures, or distillates, RSO is a full extract cannabis oil (FECO) — meaning it captures the entire range of cannabinoids, terpenes, and flavonoids from the plant.

This makes it highly potent, often containing very high levels of THC. The oil is thick, sticky, and dark, resembling tar or molasses.

RSO is used by patients for a wide variety of conditions, particularly for its pain-relieving, sedative, and potential anti-tumor properties.

While scientific evidence is still emerging, thousands of patients around the world swear by it as part of their wellness routines.

This ultimate guide will explore everything you need to know about RSO: what it is, how to make it, how to take it, the different types available, potential benefits, side effects, legality, FAQs, and where to buy it.

Chapter 1: The Origins of RSO

Who Is Rick Simpson?

Rick Simpson was working as an engineer in Canada when he suffered a serious head injury in 1997. After trying traditional medications with little success, he discovered cannabis provided significant relief.

Years later, when diagnosed with skin cancer, he applied a cannabis extract to his skin and claimed the lesions disappeared.

Although not scientifically proven, Simpson began sharing his oil recipe with others for free. The story spread online and in documentaries, and the oil became known as Rick Simpson Oil (RSO).

What Makes RSO Unique?

• High THC Content: Most RSO is made from THC-rich strains, often containing 60–90% THC.
• Full-Spectrum: Unlike CBD isolate or THC distillate, RSO keeps the full plant profile.
• Thick Consistency: Sticky, tar-like oil stored in syringes or jars.
• Medical Use: Traditionally consumed orally or topically, not smoked or vaped.

Chapter 2: RSO vs Other Cannabis Products

It’s easy to confuse RSO with other cannabis extracts. Here’s how it compares:

Product	Cannabinoid Profile	Consistency	Common Uses	Legality
RSO (Rick Simpson Oil)	High THC, full spectrum	Thick, tar-like	Oral, topical	Legal in regulated states only
CBD Oil	High CBD, low THC	Thin oil	Anxiety, pain, wellness	Federally legal (<0.3% THC)
FECO (Full Extract Cannabis Oil)	THC or CBD dominant	Thick	Medical use	Depends on local cannabis laws
Tincture	THC or CBD, alcohol-based	Liquid	Sublingual	Widely available in dispensaries
Distillate	Isolated THC or CBD	Syrupy	Edibles, vaping	Legal in regulated markets

Key takeaway: RSO is not CBD oil. If you’re looking for non-psychoactive relief, CBD is safer. If you want a powerful, full-spectrum cannabis extract, RSO is the answer.

Chapter 3: Potential Benefits of RSO

Disclaimer: RSO is not FDA-approved. Research is still limited, and patients should consult healthcare professionals before using it for medical conditions.

Reported Uses of RSO

• Cancer support: Many patients use RSO alongside chemotherapy or radiation.
• Chronic pain relief: THC’s analgesic properties make RSO popular among pain patients.
• Neurological disorders: Some patients with MS, epilepsy, and Parkinson’s turn to RSO.
• Insomnia: RSO’s sedative effects often lead to deep, restful sleep.
• PTSD & anxiety: Some patients report reduced anxiety and improved mood.

Scientific Evidence

• Animal studies: Cannabinoids show potential in slowing tumor growth.
• Small human trials: Cannabis extracts improve quality of life for cancer patients.
• Entourage effect: Full-spectrum extracts may work better than isolated compounds.

Expert Insight

“RSO has always been one of the most talked-about cannabis extracts because of its potency and full-spectrum profile. At Cannabis Training University, we emphasize that while many patients share positive experiences with RSO, it should be approached with caution, education, and respect for its strength. Always start low, go slow, and buy from a trusted source.”
— Jeff Zorn, CEO of Cannabis Training University

Chapter 4: How to Make RSO at Home

Safety Warning: Making RSO requires flammable solvents. Always use food-grade ethanol, work in well-ventilated areas, and avoid open flames. Many patients prefer dispensary-purchased RSO for safety.

Ingredients & Tools

• 1 oz dried cannabis (preferably high-THC)
• Food-grade ethanol (never use lighter fluid or toxic solvents)
• Large glass/stainless steel container
• Coffee filter or cheesecloth
• Rice cooker or double boiler
• Glass jars or syringes for storage

Step-by-Step Process

1. Prepare cannabis: Break into small pieces.
2. Solvent wash: Cover with ethanol, stir for 2–3 minutes.
3. Strain: Filter into a clean container.
4. Evaporate solvent: Heat gently until most liquid is gone.
5. Purge: Allow bubbles to stop forming — ensures solvent is gone.
6. Store: Thick oil is collected in syringes or jars.

Yield: 1 ounce of cannabis produces about 3–4 grams of RSO depending on potency.

Chapter 5: Types of RSO

RSO isn’t just one product — it comes in different forms:

• RSO Syringes: Most common format. Easy for dosing.
• RSO Capsules: Perfect for beginners who want precision and no mess.
• RSO Tincture: Diluted with carrier oils, easier to take under the tongue.
• RSO Edibles: Infused into gummies or chocolates. Longer-lasting effects.
• RSO Topicals: Applied directly to the skin for localized relief.

Chapter 6: How to Take RSO

Because RSO is extremely potent, careful dosing is essential.

Rick Simpson’s Original Protocol

• Start: Half a grain of rice-sized dose, 3x daily.
• Increase every 4 days.
• Target: 1 gram per day by week 4–5.
• Goal: 60 grams over 90 days.

Modern Approach

• Many patients microdose RSO instead of following the full protocol.
• Small amounts can be used for sleep, pain, or stress relief.

Methods of Use

• Oral ingestion (capsules or syringes): Long-lasting effects.
• Sublingual tinctures: Faster onset.
• Topical: For skin issues or localized pain.
• Edibles: Delayed but extended relief.

A Personal Perspective: My First Experience with RSO

When I first tried RSO, I underestimated just how powerful it was. I placed what I thought was a tiny dab on a cracker — and within an hour, I felt waves of relaxation stronger than anything I’d ever experienced.

What surprised me most wasn’t just the intensity, but the duration. The effects lasted nearly the whole day. After that first time, I learned to respect the oil. Starting with a piece no bigger than half a grain of rice made all the difference.

For me, RSO became a tool for better sleep and stress relief. I also tried applying a small amount topically on sore muscles and found noticeable relief.

The lesson? Respect the oil. RSO is not your average cannabis product — but when used carefully, it can be one of the most effective wellness tools available.

Chapter 7: Side Effects & Safety

Common Side Effects

• Drowsiness
• Dizziness
• Dry mouth
• Anxiety/paranoia (if too much taken)
• Hunger (“the munchies”)

Who Should Avoid RSO

• Pregnant or breastfeeding individuals
• People with history of psychosis
• Those with THC restrictions (workplace drug testing)

Chapter 8: Where to Buy RSO

Licensed Dispensaries

• Safest and most reliable option.
• Look for lab-tested RSO with Certificates of Analysis (COAs).

Online Sellers

• Many claim to sell RSO, but beware of scams and fake oils.
• Always request lab results before purchase.

Caregivers & Homemade

• Some caregivers provide RSO, but quality varies.

Tip: Search “RSO near me” or “where to buy RSO oil” in your state to find regulated options.

Chapter 9: Legal Status of RSO

• USA: Legal in states with medical/recreational cannabis. Illegal federally if THC >0.3%.
• Canada: Fully legal.
• Europe: Mixed — legal in some countries, banned in others.
• Asia/Middle East: Mostly illegal.
• Latin America: Slowly expanding medical cannabis programs.

Chapter 10: Reviews & User Experiences

• Positive: Pain relief, better sleep, increased appetite, skin healing.
• Negative: Too strong, difficult to handle, expensive.

Chapter 11: FAQs About RSO

Chapter 12: Final Thoughts on RSO

Rick Simpson Oil, RSO, is one of the most potent and legendary cannabis extracts. Whether you’re considering it for pain, sleep, or other medical uses, the most important factors are:

• Start with very small doses.
• Buy only from trusted, lab-tested sources.
• Respect its potency.

RSO may not be for everyone, but for those who find relief with it, it can be life-changing. Learn how to make an easy full extract cannabis oil with online cannabis cooking and extraction courses from CTU.