fso oil how to use: A Complete Guide to RSO
To use FSO oil (RSO), start with a rice-grain-sized dose (about half a drop) placed under the tongue or added to food, and hold it for 90 seconds. Increase gradually over days, and always consult a professional for personalized dosing.
How to Make RSO at Home (With Safety Warnings)
Making RSO at home is possible, but it involves flammable solvents and precise steps. Follow this checklist carefully. Never use open flames or work near heat sources.
- Gather supplies: You'll need cannabis flower (not trim), a solvent like ethanol (e.g., Extractohol), a large glass or mason jar, a rice cooker or double boiler, a coffee filter, and a dosing syringe.
- Decarboxylate the flower: Spread the flower on a baking sheet and heat at 240°F (115°C) for 30-40 minutes to activate the THC.
- Soak and shake: Place the decarboxylated flower in the mason jar, cover with solvent, and shake well for 3-5 minutes. Repeat this process twice with fresh solvent to extract all cannabinoids.
- Strain and filter: Pour the solvent mixture through a coffee filter to remove plant material. Squeeze the filter to extract all liquid.
- Evaporate the solvent: Pour the liquid into a rice cooker or double boiler and gently heat at low temperature (under 200°F) until all alcohol evaporates. This takes several hours. Warn: Do this outdoors or in a well-ventilated area, away from flames.
- Collect and store: Scrape the remaining dark oil into a dosing syringe. Store in a cool, dark place.
Making RSO at home is risky due to solvent flammability and potency variability. For consistent, lab-tested results, consider purchasing from a professional source like our RSO oil for cancer program.



How to Use RSO: Step-by-Step Methods
There are several ways to consume RSO, but the most common and effective is sublingual administration. Here's how to use RSO correctly:
- Start with a rice-grain dose: Squeeze a tiny amount (about half a drop) from the dosing syringe onto a toothpick or the end of a spoon.
- Place under the tongue: Put the oil under your tongue and hold it there for 90 seconds. This allows for quick absorption into the bloodstream.
- Swallow or add to food: After 90 seconds, swallow the oil. You can also add RSO to food or drinks, like smoothies or peanut butter, but avoid high heat as it can degrade the oil.
- Wait and observe: Effects typically appear within 30-60 minutes when taken sublingually, and 60-90 minutes when ingested. Start with small doses and steadily increase your dosage over days.
- Adjust as needed: If you prefer, you can also use RSO rectally via a dosing syringe, which has higher bioavailability. Always consult a professional for guidance.
Can you vape Rick Simpson oil? No. RSO is not meant for vaping. It's too thick and contains residual solvents that can be harmful when inhaled. Stick to oral or sublingual methods.
What Is RSO and How Does It Work?
RSO (Rick Simpson Oil) is a full-extract cannabis oil named after Rick Simpson, who popularized it in 2003. It's made by soaking cannabis flower in a solvent (like ethanol) and then evaporating the solvent to leave a concentrated oil. Unlike CBD-only products, RSO contains the full spectrum of cannabinoids, including THC, CBD, and CBG, which work together in the body's endocannabinoid system.
| Aspect | RSO (FSO) | CBD Oil |
|---|---|---|
| Cannabinoids | THC, CBD, CBG, and more | Typically CBD only |
| Psychoactive | Yes (due to THC) | No (unless full-spectrum with trace THC) |
| Potency | High (50-90% THC) | Low to moderate |
| Usage | Sublingual, edible, rectal | Sublingual, topical, edible |
| Purpose | Full-body therapeutic effects | General wellness, anxiety, pain |
RSO is not just CBD. It's a whole-plant extract that provides the entourage effect, where all cannabinoids work synergistically. This makes it more potent and effective for many users.
RSO Dosage: How Much Should You Take?
Dosage varies by individual, but the golden rule is to start low and go slow. A typical starting dose is a rice-grain-sized amount (about 25-50 mg of oil, which contains roughly 10-20 mg THC). Here's a general dosing chart:
| Experience Level | Dose Size | THC Content | Frequency |
|---|---|---|---|
| Beginner | Rice grain (half a drop) | ~10-15 mg | Once daily |
| Intermediate | Half a grain of rice | ~15-25 mg | Twice daily |
| Advanced | Full grain of rice | ~25-50 mg | 2-3 times daily |
How long does it take for RSO to kick in? Sublingual: 30-60 minutes. Ingested: 60-90 minutes. Effects can last 4-8 hours. Use an [[rso-oil-dosage-calculator-ml|RSO dosage calculator]] to fine-tune your dose. Always increase gradually and monitor your body's response.
RSO vs. Other Cannabis Products: What's the Difference?
RSO is significantly more potent than smoking or edibles. Here's a comparison:
| Product | Potency | Onset | Duration | Best For |
|---|---|---|---|---|
| RSO | Very high (50-90% THC) | 30-90 min | 4-8 hours | Therapeutic, full-body effects |
| Smoking/Vaping | Moderate (10-30% THC) | Immediate | 1-3 hours | Quick relief |
| Edibles | Variable (10-100 mg THC) | 30-120 min | 6-8 hours | Long-lasting effects |
| CBD Oil | Low (no THC) | 30-60 min | 2-4 hours | Non-psychoactive relief |
Does RSO get you higher than smoking? Yes, because it's much more concentrated. Is RSO stronger than edibles? It depends on the edible's dose, but RSO is typically more potent per gram. RSO is not just CBD; it's a full-spectrum extract with THC, making it psychoactive.
Is RSO Safe? Side Effects, Drug Tests, and Legal Status
RSO is generally safe when used responsibly, but it does have side effects. Common ones include drowsiness, dry mouth, red eyes, increased heart rate, and dizziness. These are more pronounced in beginners or with high doses. Always start small and increase gradually.
Will RSO show up on a drug test? Yes. RSO contains THC, which is detectable in urine, blood, and hair tests for days to weeks after use. If you have a drug test, avoid RSO.
Legal status: RSO is legal in many states where cannabis is legal, but it remains federally illegal in the US. Check your local laws. For side effect management, see our [[rick-simpson-oil-side-effects|side effects guide]]. The World Health Organization recognizes the potential therapeutic benefits of cannabinoids, but more research is needed.
Where to Buy RSO: Finding Quality Products
You can find RSO at licensed dispensaries or from online providers. Here's how to ensure you get a quality product:
- Check lab results: Look for third-party lab testing that confirms potency and purity. Our products are lab-tested and organic.
- Ask about the source: Quality RSO uses only cannabis flower, not trim. Our founder, Brian Turner, has 25 years of organic cultivation experience.
- Consider the format: RSO is available as nasal spray, oral tincture, pure oil, or rectal dosing syringe. Choose what fits your lifestyle.
- Get a free consultation: We offer free consultations and personalized protocol development. Call us or visit our RSO oil for cancer program page to learn more.
We're available 7 days a week via video calls, phone, or text. Let us help you find the right product and dosage.
Also asked as
- How do I take Rick Simpson oil?
- What is the correct way to use RSO?
- Can you vape Rick Simpson oil?
Frequently asked questions
What is the correct way to use RSO?
The correct way is to place a small dose (rice-grain size) under your tongue and hold it for 90 seconds before swallowing. You can also add it to food or drinks, but avoid high heat. Always start with a low dose and increase gradually.
Is RSO just CBD?
No. RSO is a full-extract cannabis oil containing THC, CBD, CBG, and other cannabinoids. It's psychoactive due to THC, unlike CBD-only products.
How many drops of CBD oil do you start with?
For CBD oil, a typical starting dose is 1-2 drops (about 5-10 mg) under the tongue, 1-2 times daily. But for RSO, which is much stronger, start with a rice-grain-sized amount, not drops.
Can you vape Rick Simpson oil?
No. RSO is not meant for vaping. It's too thick and may contain residual solvents that are harmful when inhaled. Use oral, sublingual, or rectal methods instead.
Does RSO get you higher than smoking?
Yes, RSO is significantly more potent than smoking cannabis. It contains 50-90% THC, so even a small dose can produce strong psychoactive effects.