CO2-Extracted vs Cold-Pressed CBD Oil: What Is the Difference?

Last updated: October 2026.

Product labels love to mention how their CBD was made: “CO2-extracted”, “cold-pressed”, “solvent-free”. But what do these terms actually mean, and do they matter? This guide explains the main ways CBD oil is made, the important difference between cold-pressed hemp seed oil and CBD oil, and what really tells you whether a product is good.

The short answer

• CO2 extraction uses pressurised carbon dioxide to pull cannabinoids out of hemp flowers and leaves. It is clean, controllable and widely used for CBD.
• Cold pressing is mainly used to make hemp seed oil. Hemp seeds contain little or no CBD, so cold-pressed hemp seed oil is not a CBD supplement on its own.
• Ethanol extraction is the other common method for CBD and is also efficient and safe when done well.
• The lab report matters more than the method. It tells you how much CBD is actually in the bottle and confirms the THC content.

Where is CBD found in the hemp plant?

CBD is made mainly in tiny resin glands called trichomes, found mostly on the flowers and, to a lesser extent, the leaves. The seeds contain little or no CBD. That single fact explains most of the confusion around “cold-pressed CBD oil”.

What is CO2 extraction?

Supercritical CO2 extraction uses carbon dioxide under high pressure and controlled temperature, where it behaves partly like a liquid and partly like a gas. In this “supercritical” state, CO2 acts as a solvent, dissolving cannabinoids and other compounds out of the plant material. When the pressure is released, the CO2 turns back into a gas and evaporates, leaving a concentrated extract with no solvent residue.

The same technology is used in the food industry, for example to decaffeinate coffee and extract hops for brewing. Its main advantages are control (producers can adjust pressure and temperature to target certain compounds) and cleanliness. The downside is cost: the equipment is expensive.

What is cold pressing?

Cold pressing means mechanically squeezing oil out of seeds without adding heat or chemicals, in the same way extra virgin olive oil is made. With hemp, cold pressing is used on the seeds to make hemp seed oil, a green, nutty oil rich in omega-3 and omega-6 fatty acids.

Because the seeds contain little or no CBD, cold-pressed hemp seed oil is a food oil, not a CBD supplement. It is perfectly good for salad dressings and as a carrier oil, but on its own it will not give you meaningful CBD. Some products sold online as “hemp oil” with very large mg numbers on the label are exactly this.

Cold pressing can be applied to hemp flowers, but it is inefficient and leaves much of the CBD behind, so it is rarely used for commercial CBD products.

What is ethanol extraction?

Ethanol extraction soaks hemp in food-grade alcohol, which dissolves the cannabinoids. The plant material is filtered out and the alcohol is evaporated and recovered. It is efficient, scalable and widely used. Done well, it leaves no meaningful residue, and good producers test for residual solvents.

Extraction methods compared

	CO2 extraction	Ethanol extraction	Cold pressing
Main use	CBD and other cannabinoids	CBD and other cannabinoids	Hemp seed oil (food)
Starting material	Flowers and leaves	Flowers and leaves	Seeds
CBD content	High, concentrated	High, concentrated	Little or none (from seeds)
Solvent	CO2 (evaporates)	Food-grade alcohol (evaporated)	None
Cost	High	Moderate	Low

What about other extraction methods?

A few other methods exist. Hydrocarbon extraction, using solvents such as butane, is efficient but needs careful purging and is less common for food supplements. Olive oil infusion, where plant material is heated in olive oil, is a simple home method, but the result is weak and spoils quickly. Solventless methods, such as pressing resin with heat, are used mainly in the cannabis market rather than for food supplements.

Isolate, refined extract and whole-plant extract

After extraction, producers can take the extract in different directions:

• CBD isolate is purified to around 99% CBD, with almost everything else removed. It is tasteless and contains no THC.
• Refined extracts remove THC and unwanted plant material but keep some other natural compounds.
• Whole-plant extracts keep most of the plant’s compounds, which usually includes some THC. Because Irish law has no tolerance for THC in food, these carry more risk in Ireland.

Whatever the type, the lab report should confirm the THC result for the batch.

What happens after extraction?

Extraction is only the first step. The raw extract is usually filtered to remove plant waxes and other unwanted material, and may be refined further. It is then tested, measured and blended into a carrier oil, such as hemp seed oil or MCT oil, at a set strength, such as 10%, 20% or 30%. Finally, the finished batch is tested again for its CBD content, THC, heavy metals and pesticides.

Our CBD oils contain two ingredients: hemp extract and hemp seed oil. Every batch is independently tested, and the lab report is on each product page.

Does the extraction method affect the taste?

Yes, a little. Less refined extracts keep more of the plant’s natural compounds, such as terpenes and chlorophyll, which give a stronger, earthier taste. More refined extracts taste milder. The carrier oil matters too: hemp seed oil is nutty and grassy, while MCT oil is almost tasteless. Read more in what does CBD oil taste like?.

Hemp seed oil vs CBD oil at a glance

	Hemp seed oil	CBD oil
Made from	Hemp seeds (cold-pressed)	Hemp extract in a carrier oil
CBD content	Little or none	Stated in mg on the label
Main use	Cooking, dressings, nutrition	Food supplement, taken in drops
Legal category	Ordinary food	Novel food rules apply
Price	Low	Higher, reflecting CBD content

If a product called “hemp oil” does not state its CBD content in mg and has no lab report showing CBD, assume it is hemp seed oil.

How to judge any CBD oil, whatever the method

• CBD content in mg for the bottle and per drop, not just “hemp oil” in mg.
• An independent lab report for the batch, showing CBD content and the THC result.
• Contaminant testing for heavy metals, pesticides and, for solvent-extracted products, residual solvents.
• A real company with an address and contact details.
• No medical claims.

See our full guide to where to buy CBD oil in Ireland for more on comparing products and prices.

Frequently asked questions

Is CO2-extracted CBD oil better than cold-pressed?

For CBD content, usually yes. CO2 extraction is designed to concentrate cannabinoids, while cold pressing is mainly used to make hemp seed oil, which contains little or no CBD. What matters most is the lab report showing how much CBD is in the bottle.

Does cold-pressed hemp oil contain CBD?

Cold-pressed hemp seed oil, made from the seeds, contains little or no CBD, because CBD is found mainly in the flowers and leaves. It is a nutritious food oil, but it is not a CBD supplement.

Is CO2 extraction safe?

Yes. Supercritical CO2 extraction is widely used in the food industry, for example to decaffeinate coffee. When the pressure is released, the CO2 returns to a gas and evaporates, leaving no solvent residue.

What is ethanol extraction?

Ethanol (food-grade alcohol) extraction soaks plant material in alcohol to dissolve the cannabinoids, then evaporates the alcohol. It is efficient and widely used; good producers test for residual solvents.

Can I tell how a CBD oil was made?

Some brands state the extraction method on the label or website. If not, ask. Either way, the lab report tells you what matters: CBD content, THC and contaminants.

What is the carrier oil in your CBD oil?

Our oils contain hemp extract and hemp seed oil, with no added flavourings.

Why are some cheap “hemp oils” so strong on the label?

Some list the total weight of hemp seed oil in mg, which looks like a huge number but says nothing about CBD. Look for the CBD content in mg and a lab report.

Which extraction method keeps the most terpenes?

Methods using lower temperatures and gentler processing tend to keep more of the plant’s aromatic compounds. Terpene content is shown on some lab reports, but it is not a measure of quality on its own.

Is supercritical CO2 the same as “solvent-free”?

CO2 is technically a solvent, but it evaporates completely when the pressure is released, which is why CO2-extracted products are often described as solvent-free.

Does extraction method change how CBD works in the body?

No. CBD is the same molecule whichever way it is extracted. The method can affect which other compounds come with it, the taste and the purity, which is why testing matters.

Is hemp seed oil good for you?

Hemp seed oil is a nutritious food oil, rich in omega-3 and omega-6 fatty acids. Use it cold, in dressings or drizzled over food, as it is not suited to high-heat cooking.

Disclaimer: CBD is sold as a food supplement. It is not intended to diagnose, treat, cure or prevent any disease and is not a substitute for medical advice. Always consult a healthcare professional before starting a new supplement, especially if you take medication, are pregnant or breastfeeding.