RSO vs FECO: What’s the Difference?
Last Updated:October, 2026 • Josh
RSO and FECO are often talked about as if they are two clearly different cannabis products. In reality, the distinction is not always that simple.
Both names can refer to thick, concentrated cannabis extracts designed to retain a broad range of compounds from the original plant. RSO has a specific history connected to Rick Simpson, while FECO simply stands for Full Extract Cannabis Oil. But once you start comparing products in the real world, those labels can overlap considerably.
Understanding that overlap matters. Instead of choosing an oil based only on whether the package says RSO or FECO, it is more useful to understand how it was made, what cannabinoids it contains, how concentrated it is and whether reliable testing is available.
- RSO stands for Rick Simpson Oil while FECO stands for Full Extract Cannabis Oil.
- Both terms are commonly used for concentrated cannabis extracts that retain a broad range of plant compounds.
- RSO refers partly to a specific history and style of cannabis oil while FECO is a broader descriptive term.
- There is no consistent industry rule that makes every product labeled RSO fundamentally different from every product labeled FECO.
- Extraction methods can vary, so the product name alone does not reliably tell you which solvent or process was used.
- Cannabinoid content, potency, testing and product quality usually tell you more than the words RSO or FECO on the label.
- Neither RSO nor FECO is automatically better. What matters is what is actually in the product and whether it fits the person using it.
Why RSO and FECO Get Confused
If you spend much time reading about concentrated cannabis oils, you will eventually see RSO and FECO mentioned in the same conversation. Sometimes people describe them as two different products. Other times the terms are treated almost interchangeably.
There is a reason for the confusion.
Both generally refer to highly concentrated cannabis extracts that aim to carry more than a single isolated cannabinoid into the finished oil. They are often thick, dark and sold in small syringes because relatively little material can contain a significant amount of cannabinoids.
The difference is mainly in what the names are trying to describe.
RSO is a name tied to a person and a particular history in cannabis culture. FECO is a descriptive term. It literally means Full Extract Cannabis Oil.
That sounds like it should create a clean distinction, but cannabis terminology rarely stays that tidy once products enter the marketplace.
What RSO Actually Means
RSO stands for Rick Simpson Oil.
The name comes from Canadian cannabis advocate Rick Simpson, who popularized a method of creating concentrated cannabis oil using solvent extraction. Over time, the term RSO became associated with thick, potent cannabis extracts that retain a broad range of compounds from the plant.
Today, however, not every product labeled RSO is produced exactly the same way.
Manufacturers may use different cannabis varieties, solvents, temperatures, filtration methods and levels of refinement. Some RSO is strongly THC dominant while other versions may contain considerably more CBD.
This is why it is more useful to think of RSO as a recognizable style and lineage of concentrated cannabis oil rather than one standardized formula.
If you are completely new to this type of extract, Mercy Leaf's What Is RSO? guide is a better starting point before getting deeper into the differences between concentrated oils.
What FECO Means
FECO stands for Full Extract Cannabis Oil.
The name describes the intention behind the extract rather than connecting it to one person or original method. A FECO product generally aims to capture a broad portion of the cannabis plant's extractable compounds rather than separating out a single cannabinoid such as THC or CBD.
That can include major cannabinoids, minor cannabinoids and other plant compounds depending on the starting material and extraction process.
The word full can be a little misleading, though. It does not mean that every chemical compound present in the original plant survives extraction unchanged. No extraction method captures literally everything.
A better way to understand the name is that FECO generally refers to a broad or whole plant style of extract rather than a highly purified isolate.
This is closely related to the idea of full-spectrum cannabis, where the goal is to retain a wider chemical profile rather than reducing the product to one isolated compound.
So What Is the Actual Difference?
The simplest way to think about it is this:
RSO describes a particular tradition of concentrated cannabis oil. FECO describes a broader category or idea.
That means RSO can reasonably be considered a form of full extract cannabis oil, but not every product being sold as FECO necessarily follows the history or production style associated with RSO.
In practice, even that distinction becomes blurry because cannabis manufacturers do not all use the terminology the same way.
One company may label a thick ethanol extract RSO. Another may sell a very similar product as FECO. Another producer may use the term FECO for an extract created using a different process altogether.
This is why trying to identify a product solely by one of these names can create more confusion than clarity.
Instead of asking only, "Is this RSO or FECO?" it is usually more useful to ask, "What is actually in this oil and how was it produced?"
Extraction Method Matters More Than the Name
Both RSO and FECO involve concentrating compounds from cannabis plant material into a much smaller amount of extract.
A solvent or other extraction method separates cannabinoids and additional plant compounds from the original material. The extract is then processed into the concentrated oil that reaches the consumer.
Ethanol is commonly used for this style of whole plant extraction because it can pull a wide range of compounds from cannabis. Other extraction systems also exist and products marketed as full extract oils are not limited to one process.
Different methods can influence what remains in the finished extract.
Temperature, contact time, filtration and additional refinement can affect the amount of chlorophyll, waxes, lipids, terpenes and other compounds that remain alongside the cannabinoids.
That helps explain why two concentrated oils can look, smell and feel different even when both are marketed as full plant extracts.
For readers who want to understand the general process without turning it into a home extraction tutorial, How Is RSO Made? Understanding the Process Behind Rick Simpson Oil goes deeper into how extraction changes plant material into concentrated oil.
Full-Spectrum Does Not Mean Every Oil Is the Same
Both RSO and FECO are frequently associated with the term full-spectrum.
That is useful, but it should not create the impression that every full-spectrum extract has the same chemical profile.
The finished oil still reflects the cannabis it came from.
A THC dominant plant will usually create a very different extract from a CBD dominant plant. Minor cannabinoids can vary as well. Processing may also change how much of certain compounds remain by the time the product is finished.
Even products made from similar cannabis can differ between batches.
This is one reason Mercy Leaf encourages people to think beyond broad labels like "full-spectrum." The term tells you something about the general philosophy behind a product, but it does not tell you the exact cannabinoid profile, potency or how someone will respond to it.
The actual numbers matter.
What Matters More Than RSO vs FECO
When comparing two concentrated oils, there are several questions that are usually more helpful than deciding which name sounds better.
Start with the cannabinoid profile. How much THC, CBD and other cannabinoids are present?
Then look at potency. Concentrated oils can contain large amounts of cannabinoids in a very small volume, so knowing the actual concentration matters far more than assuming one type is automatically stronger.
The extraction method is also worth understanding when that information is available. Knowing how a product was produced gives you more context than a marketing term alone.
Testing is another major piece of the picture.
A Certificate of Analysis, often called a COA, can help confirm potency and show whether the product was tested for things such as pesticides, heavy metals, microbes and residual solvents.
This becomes particularly important with concentrated products because extraction concentrates the compounds we want, but poor starting material or poor processing can also concentrate things we would rather not consume.
Mercy Leaf's guide to How to Read Cannabis Labels and Lab Reports (COAs) explains what to look for when reviewing those results.
Is RSO Better Than FECO?
There is no useful universal answer.
If two products are made from similar cannabis, retain similar compounds, have comparable potency and have both been produced and tested responsibly, the difference between the words RSO and FECO may matter very little to the person using them.
In another comparison, the products could be completely different.
One may be THC dominant while the other contains substantial CBD. One may have undergone more filtration. One may have reliable contaminant testing while the other provides very little information about how it was produced.
Those differences are much more meaningful than the name printed on the package.
This is also why neither RSO nor FECO should automatically be viewed as more natural, more medicinal or more effective. Those claims require information about the actual product and, when health outcomes are involved, evidence that goes well beyond the extraction label.
For someone trying to make an informed choice, the better question is not necessarily RSO or FECO?
It is:
What is in this extract, how was it made and does it make sense for the person considering it?
Frequently Asked Questions
They can be very similar and the terms are sometimes used interchangeably. RSO refers to a type of concentrated cannabis oil associated with Rick Simpson and the extraction approach he popularized. FECO is a broader term meaning Full Extract Cannabis Oil. Because producers use these names differently, two products labeled RSO and FECO may sometimes have more in common than their names suggest.
No. Ethanol is commonly associated with full extract cannabis oils and many FECO products are made this way, but the term is not used consistently across the cannabis industry. Some products marketed as FECO are produced using other extraction methods, including CO₂. The label should not be treated as proof of a specific extraction process.
No. Modern RSO products may use food-grade ethanol, but the term RSO does not guarantee one specific solvent or manufacturing process. Production methods vary between manufacturers and regions, which is another reason to look beyond the product name.
Not necessarily. Potency depends on the starting cannabis, cannabinoid concentration and final formulation rather than whether the product is called RSO or FECO. A lab report provides much more useful information about strength than the name alone.
Neither name guarantees greater safety. Factors such as regulated production, contaminant testing, residual solvent testing, accurate potency information and proper storage matter much more. A trustworthy Certificate of Analysis can help you understand what is actually in a product.
No. Many traditional RSO products are THC dominant, but concentrated oils can also be made from CBD dominant or mixed cannabinoid cannabis. Mercy Leaf already explores this distinction in its guide to THC RSO vs CBD RSO.
Look beyond the product name. Check the cannabinoid profile, total potency, serving information, extraction method if disclosed, batch number and Certificate of Analysis. Testing for contaminants and residual solvents is particularly relevant for concentrated extracts.
The difference between RSO and FECO is much less clear-cut than the names sometimes make it sound.
RSO carries a particular history. FECO describes the idea of a full extract cannabis oil more broadly. But in today’s cannabis market, those categories overlap enough that the name on the syringe should never be the only thing guiding a decision.
What matters more is the oil itself: what plant material went into it, how it was extracted, which cannabinoids are present, how potent it is and whether the finished product has been properly tested.
That is a useful habit far beyond this one comparison. Cannabis terminology changes quickly and marketing language is not always standardized.
Learning to look past the label and understand what is actually inside a product is one of the best ways to make more informed choices.
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Mercy Leaf Educational Disclaimer
Mercy Leaf provides educational information about cannabis and related topics for informational purposes only. This content is not intended to diagnose, treat, cure, or prevent any disease, and should not be considered medical or legal advice. Cannabis laws vary by jurisdiction, and individual responses to cannabis products may differ. Always consult a qualified professional before making health-related decisions.