What is Rick Simpson Oil (RSO)?

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Rick Simpson oil has turned many medical marijuana skeptics into believers. The extremely potent cannabis concentrate is used by patients orally or topically to treat a variety of medical conditions and ailments. Though invented as a topical treatment for skin cancer, RSO is also used to alleviate symptoms associated with arthritis, multiple sclerosis, terminal acute lymphoblastic leukemia, cancer, chronic pain, inflammation, depression, autism, ADHD, and more. It’s possible to find RSO oil for sale online and at some marijuana dispensaries, however it’s so easy to make at home and you’ll avoid scammers.

What is rick Simpson oil?

Rick Simpson oil, often shortened to RSO is one of the very first cannabis concentrates. The oil is named after its inventor, who created RSO oil for cancer and brought marijuana as a medicine to the masses. It is dark with a very thick consistency, similar to honey and can be made from any kind of strain, however Rick recommends using a potent indica. While Rick Simpson oil isn’t as popular as it once was, it is touted by patients for its numerous health and medical benefits. The best part is that it’s very easy to make RSO oil at home.

Who is Rick Simpson?

In 2003, Rick Simpson developed bumps on his arms, which turned out to be basal cell carcinoma. He was well versed in medical marijuana since he had been using cannabis for other health issues in the past and decided to give it a try for his skin cancer. At the time, no concentrates or topicals were readily available, so Rick created his own formula, recommended cancer treatment, a sticky concentrate, which he would apply daily to the bumps and cover with a bandage. The cancerous spots disappeared within just a few days and Rick became convinced that cannabis can work for many different types of medical issues and may kill  cancer cells for skin cancer. His dermatologist refused to believe that the cannabis oils had worked and would not even consider it to treat cancer and an alternative treatment for others suffering from the same issue.

How to make homemade RSO oil

Unlike some of the other cannabis concentrates, RSO oil is very simple to make at home and requires items you probably already own. If you’ve ever made weed edibles using cannabutter, the process is quite similar. Rick Simpson’s recipe suggests using a high-THC indica, but if you are a long-time medical marijuana user and know which medical cannabis strains work best for your symptoms, be sure to use it in your recipe.

Rick Simpson oil recipe

RSO oil is very easy to make but there are a few precautions to take, which will keep you safe. The solvent needs to be cooked uncovered and the fumes are highly flammable. Do not cook the solvent near ovens, stoves or flames and never smoke or create a spark in the vicinity of the rice cooker. Always use a fan for adequate airflow and cook outside if possible.

Rick Simpson developed the RSO treatment which calls for ingesting 60 grams (½ a cup) of full spectrum cannabis oil over 90 days. The following recipe makes the exact amount you’ll need for one treatment, but can be divided for shorter treatment periods. One ounce of marijuana will produce around three to four grams of oil. Rick Simpson recommends a high-quality indica for medicinal purposes, but you should choose a strain you know works for your ailments.


  • 1 pound of high-quality flower (preferably indica)
  • 2 gallons of 99% isopropyl alcohol or grain alcohol
  • Clean 5-gallon bucket
  • Large glass mixing bowl
  • Wooden spoon
  • Coffee filters with funnel or cheesecloth
  • Rice cooker
  • At least one fan
  • Syringe


  1. Place the marijuana flower in the bucket or large bowl if making a smaller batch and submerge in alcohol. Crush and break up the bud thoroughly using your hands or a wooden spoon. The liquid should be dark in color.
  2. Pour the liquid into the coffee filter or cheesecloth over a large glass bowl to strain and remove large particles. Repeat the first step with the same marijuana and strain into the bowl. A third wash can be done if you want a less potent result.
  3. Turn on a fan so the wind passes over the top of the rice cooker and pour in the strained liquid. Do not fill the rice pot more than Âľ of the way full. For large batches you will need to do multiple cooking sessions. Leave the rice cooker uncovered and make sure there is adequate airflow above the rice cooker. Never cook RSO without a fan!
  4. The liquid will cook down considerably to a syrupy consistency. Once it starts bubbling and the solvent has evaporated completely, turn off the rice cooker and fill the syringe for easy storage and dosing.

How to use RSO

Remember that no preclinical and clinical assessment studies have been conducted to prove the effectiveness of RSO, but if you speak with medical marijuana patients, many agree that it helps relieve a number of symptoms, skin cancer, chronic pain, and autism being the most treated conditions. As with any lifestyle change, it’s important to consult a doctor, however most medical professionals will not acknowledge cannabis extract treatment as a medicine method. If you do decide to start treatment with RSO on your own, do research, speak with others who use RSO for similar ailments, and do so at your own discretion.

The RSO treatment method developed by Rick Simpson lasts for 90 days, where the user will slowly consume around 60 grams (½ a cup) of oil over the course of the roughly three-month period. During the 90 days, patients will gradually increase the dosage either putting the oil directly into their mouth or mixing it into food or drinks.

Rick Simpson oil dosage

Rick Simpson oil is extremely potent, and users often report sleepiness and feeling very high for the first few weeks of RSO treatment. Patients should not have important responsibilities or plan on driving for at least the first five weeks until tolerance builds. One dose is the size of ½ a grain of rice. This is an extremely small quantity. Take out one grain of rice so you can imagine just how small one dose actually is visually. If the oil cools and hardens, simply run the syringe under hot water.

  • Begin treatment with one dose every eight hours for the first week. You will be taking a dose three times per day: morning, noon, and night.
  • Starting week two, double your dose every four days until you are taking one gram per day, or the equivalent of eight rice-sized drops of oil three times per day. Do not take more than one gram per day.
  • By week five, you should reach the maximum of one gram per day split between the three daily doses. Continue taking this dosage until you complete the 90 day treatment. If you want to continue using RSO beyond the 90 day treatment using maintenance doses, do not take more than one gram a month.

Rick Simpson oil dosage chart

Rick Simpson oil dosage chart

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