An RSO syringe is a small, needleless plastic syringe filled with Rick Simpson Oil, a thick, dark cannabis extract known for its high THC concentration. The syringe typically holds 1 mL (about 1 gram) of oil containing between 600 and 800 mg of THC. It’s not a medical syringe meant for injection. Instead, the plunger mechanism exists because RSO has a sticky, tar-like consistency that would be nearly impossible to measure or handle without one.
What RSO Actually Is
Rick Simpson Oil is made by washing cannabis flower with a solvent, then boiling off that solvent to leave behind a concentrated, dark oil. It’s named after a Canadian engineer and cannabis activist who claims he used the oil to treat basal cell skin cancers on his arm. The extract retains the plant’s full spectrum of cannabinoids, terpenes, and other compounds, which distinguishes it from more refined products like distillate.
RSO is one of the most concentrated cannabis products available. While a typical edible might contain 5 to 10 mg of THC per serving, a single gram of RSO packs 600 to 800 mg. That potency is what draws medical cannabis patients managing chronic pain, inflammation, or other serious conditions, but it also means even a tiny amount can produce strong effects.
Why It Comes in a Syringe
RSO looks and behaves like thick, black tar. It clings to everything it touches, and scooping it out of a jar with any precision would be a mess. The syringe solves two problems at once: it keeps the oil sealed away from air and light, and it lets you push out very small, controlled amounts using the plunger’s measurement markings.
Because the oil is so viscous, you’ll often need to warm the syringe before use. Holding it in your closed hand for a minute or two, or running it under warm (not hot) water while keeping the plunger end dry, softens the oil enough to dispense. One practical tip: stop pressing the plunger just before you reach your target dose, because the oil tends to keep dripping. If too much comes out, pulling the plunger back slightly will draw the excess back in.
How People Use an RSO Syringe
The syringe is a delivery tool, not a route of administration. Once you’ve dispensed the oil, there are several ways to take it.
- Sublingual: Place a small amount under your tongue, hold it for 60 to 90 seconds, then swallow. This allows some of the cannabinoids to absorb through the thin tissue under the tongue before the rest passes through your digestive system.
- Mixed with food: RSO blends well with fats like butter, coconut oil, or olive oil, which can improve cannabinoid absorption. People stir it into smoothies, spread it on crackers, or fold it into baked goods.
- Capsules: Squeeze a small dose into an empty gel capsule along with a few drops of carrier oil. This avoids the taste entirely and makes dosing consistent.
- Topical: For localized use, RSO can be blended with a cream or carrier oil and applied directly to the skin.
RSO is not meant to be smoked, vaped, or injected. The syringe design occasionally causes confusion on that last point, but it contains no needle and the oil is not formulated for anything other than oral or topical use.
Dosing and the 90-Day Protocol
A starting dose for someone new to RSO is roughly half the size of a grain of rice, which works out to about 1/60 of a gram. That may sound absurdly small, but at 600 to 800 mg of THC per gram, even that tiny bead contains a significant dose.
The original protocol associated with Rick Simpson calls for consuming 60 grams of RSO total over a 90-day period. Users start with that grain-of-rice dose and gradually increase over weeks until they reach about 1 gram per day. The “start low, go slow” approach matters here more than with almost any other cannabis product because of the sheer concentration. Taking too much too quickly can cause intense drowsiness, anxiety, or paranoia, especially in people without a high tolerance.
Different syringes contain different ratios of THC to CBD depending on the cannabis strain used. Some products are designed to be high-CBD or balanced, so checking the label for cannabinoid content before dosing is important.
Side Effects of High-Potency RSO
The most common issue is simply taking too much. Low doses of THC can ease anxiety and improve mood for many people, but high doses can flip that effect, amplifying anxiety or triggering paranoia. Because RSO is so concentrated, the margin between a comfortable dose and an overwhelming one is narrow for new users.
Other typical side effects include heavy sedation, dry mouth, dizziness, and impaired coordination. These effects can last significantly longer than smoking or vaping cannabis because oral consumption produces a slower, more sustained release of THC as it’s processed through the liver.
Storing an RSO Syringe
Heat, light, and air are the three things that degrade the active compounds in RSO. At room temperature in a dark cupboard or pantry, RSO remains potent for months. Refrigeration extends that to one or two years, and freezing in an airtight container can preserve it for several years or potentially longer. If you freeze it, let the syringe thaw gradually before trying to dispense, since the already-thick oil becomes nearly solid when cold. Keep it away from moisture as well, which can introduce contamination over time.
The syringe itself acts as a reasonably good airtight container as long as the cap stays on and the plunger is seated properly. For long-term storage, placing the capped syringe inside a sealed bag or container adds an extra layer of protection.
RSO Syringes vs. Distillate Syringes
Dispensaries sell both RSO and distillate in identical-looking syringes, which can cause confusion. The key difference is in how they’re made and what they contain. Distillate is a highly refined extract that isolates THC (or CBD) and strips away most other plant compounds, resulting in a clear, amber oil with little flavor. RSO retains the full range of cannabinoids, terpenes, and plant compounds from the original flower, giving it that dark color and strong, earthy taste. Many medical users prefer RSO because of the belief that these compounds work better together than in isolation, a concept often called the entourage effect.
Both come in syringes for the same practical reasons: precise dosing and easy storage. But distillate syringes are sometimes designed for vaporizing, while RSO syringes are intended only for oral or topical use. Checking the product label before using either one in a way it wasn’t designed for is worth the extra few seconds.