Glossary · Product & Form
RSO
RSO is a thick, near-black full-extract cannabis oil made by soaking whole plant material in alcohol, then cooking off the solvent. It is full-spectrum, decarboxylated (already activated), and very high in THC. It usually comes in a plastic syringe for measured dosing. Effects may vary. Please consume responsibly.
Also known as: Rick Simpson Oil, Full-Extract Cannabis Oil, FECO
- Type
- Full-extract cannabis oil
- Format
- Plastic syringe
- Extraction
- Ethanol (alcohol)
- Potency
- Very high THC
What RSO is
RSO stands for Rick Simpson Oil, named after the Canadian advocate who popularized it. You will also see it labeled full-extract cannabis oil, or FECO. It is made by soaking whole cannabis plant material in a solvent, usually ethanol, then straining and gently heating off the alcohol. What is left is a dark, syrupy oil that holds the plant's cannabinoids and terpenes together rather than isolating just one.
RSO is full-spectrum and already decarboxylated, meaning the THC is in its active form when you receive it. It is one of the more concentrated products on a dispensary shelf, so a tiny amount goes a long way.
Why it matters to a shopper
RSO shows up as a syringe, not a cartridge or a dropper bottle. The syringe lets you push out small, measured amounts, which matters because the oil is potent. A common starting reference point is a dose about the size of a grain of rice, then adjusting from there over time. Effects may vary. Please consume responsibly.
- ·Ingest it directly or spread it on food
- ·Some people put a measured amount in an empty capsule
- ·It can be added to flower, though most use it orally
- ·Start very low and go slow, since edibles-style onset is delayed
How it shows up in NY
On a New York menu, RSO is sold as a concentrate. In New York, adults 21 and older may possess up to 24 grams of cannabis concentrate outside the home, and RSO counts toward that concentrate limit (separate from the 3-ounce flower limit). Every legal product carries a Certificate of Analysis and the NY universal symbol on the label.
Is RSO the same as a vape oil?
No. RSO is a thick, dark, full-spectrum oil meant to be ingested from a syringe, and it arrives already decarboxylated and very high in THC. Vape oil is usually a thinner distillate built for a 510 cartridge or disposable. The format, texture, and intended use are different. Effects may vary.
FAQ · RSO
What is RSO and how do you use it?
RSO, or Rick Simpson Oil, is a thick full-extract cannabis oil sold in a syringe. Most people ingest a small measured amount directly or with food. It is very potent and already active, so a rice-grain-sized dose is a common starting point. Effects may vary.
Why does RSO come in a syringe?
RSO is dark, sticky, and very concentrated, so a dropper would not work well. The plastic syringe lets you push out precise, small amounts and portion your dose accurately. You are not injecting it, the syringe is just an applicator for measuring the oil.
Is RSO legal to buy in New York?
Yes, at a licensed adult-use dispensary if you are 21 or older with valid ID. RSO is a concentrate, so it counts toward New York's 24-gram concentrate possession limit outside the home. Every legal unit shows the NY universal symbol and has lab testing.
See RSO on a real menu, lab-tested and labeled.
Shop the menu