Buy RSO from a licensed shop that can show a batch-specific certificate of analysis for the exact oil in your hand, covering potency, pesticides, residual solvents, and microbials, and confirm on the package that the oil is decarboxylated so it is active when eaten. Strain names, dark glass packaging, and price per gram come after that. A tested, activated oil with a clear milligram count is the whole game. An untested jar with a bold claim is not.
What full extract cannabis oil actually is
RSO, or Rick Simpson Oil, is a whole-plant cannabis extract, most often made with food-grade ethanol, then purged and heated so THC converts from its acidic form into the form your body can use. The result is a thick, sticky paste, dark green to near black, with a bitter, vegetal taste. The phrase full extract signals that the processor kept a broad spread of plant compounds instead of isolating one cannabinoid, so you get THC, minor cannabinoids, and some terpenes, along with chlorophyll and waxes that make the taste harsh.
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It is not the same product as distillate, vape oil, or a tincture. Distillate is refined toward near-pure THC and loses most of the plant profile. RSO is not built for inhalation, and heating it in a vape pen is a bad idea. Oral and topical use are the standard routes.
What to look for before you pay
- A batch COA that matches the package. Potency numbers mean little if the lab sheet belongs to a different run. Check the batch or lot number against the label.
- Decarboxylation confirmed. Oral RSO needs to be activated. Ask whether THCA has been converted, and look at the COA: most of the THC should sit in the delta-9 column, not the THCA column.
- Solvent disclosure. Food-grade ethanol is the common choice. Ask what was used and check the residual solvent result on the lab sheet.
- Milligram clarity. You want total THC per gram or per milliliter, not just a percentage, so you can calculate a serving.
- A graduated syringe. Marks on the barrel let you measure a small serving. A plain jar does not.
- Date and storage notes. Look for a manufacture or harvest date, and keep the oil cool and dark, away from children and pets.
Parameter bands to compare
- Total THC: THC-forward RSO commonly lands between 50% and 80%, which is about 500 to 800 mg per gram.
- CBD-forward versions: sold as 1:1 or CBD-dominant, a reasonable option if you want less psychoactivity.
- Starting serving: 5 to 10 mg THC for most adults new to oral cannabis. A rice-grain blob of typical RSO can hold 25 mg or more, so measure rather than eyeball.
- Package size: 1 ml syringes, roughly 1 g, are standard, with 0.5 ml options for a first purchase.
- Consistency: a firm paste at room temperature that softens when warmed between the palms is normal.
Pitfalls that cost money
- Unlicensed delivery services and gift arrangements that skip lab testing.
- Lab sheets that list only a THC percentage with no pesticide, solvent, or microbial panel.
- Products sold as RSO that are really distillate with added color and flavoring.
- Trying to vape or dab the oil.
- Dosing by eyeball when the potency is unknown.
- Driving after a serving. Oral cannabis can take one to three hours to peak and impair you well past that.
- Ignoring state purchase limits, which apply per customer per day.
FAQ
Is RSO the same as full extract cannabis oil?
In practice the terms are used interchangeably for a whole-plant, decarboxylated oil. Ask which extraction method and solvent the producer used if you want to compare two products side by side.
Can I vape RSO?
No. It is not formulated for inhalation, and plant waxes and residual solvent make it a poor fit for a vape.
How much should I take the first time?
Start at 5 mg THC or less, wait at least two hours, then adjust. Taking it with food that contains some fat helps absorption.
Is RSO a cancer treatment?
No. Claims that cannabis oil cures cancer are not supported by clinical evidence, and regulators have warned sellers about making them. Talk to your oncology team before adding cannabis to a treatment plan.
How should I store it?
Cool, dark, and closed, with the syringe kept out of reach of children and pets. Warm it in your hands or a lukewarm water bath before measuring a serving.
Before you check out
Cannabis rules differ by state, and cannabis remains illegal under federal law in the US. Buy only from licensed retailers, keep the receipt, and treat the COA as the product's credentials. This is general buying guidance, not medical advice.