Strongest CBD oils in the UK

by for the Ageless Team May 30, 2025

Once you’ve used CBD oil for a while, you’ll know how much works for you. If you’re taking a lot of drops, a high-strength option may be more effective and offer better value.

Research suggests higher doses can offer greater support and are "remarkably safe", but it’s important to stay within the UK’s 70mg daily limit.

Stronger oils cost more upfront but last longer. To help you choose well, here’s our guide to the best certified, full-spectrum, high-strength CBD oils and sprays in the UK.

1. What is considered high-strength CBD?
2. Strongest CBD oils
3. How to take high-strength CBD oil
4. Precautions
5. Cost considerations

Strongest UK CBD oils

1. What is considered high-strength CBD oil?

A high-strength CBD oil typically contains 25% or more cannabidiol. Medium-strength oils range from 10% to 25%, and anything below 10% is considered low strength.

For example, 1000mg of CBD may seem like a large amount, but in a 10ml bottle the concentration is only 10% CBD. When you look for high-strength products you'll find oils with a strength between 25% and 50%:

• A 50% CBD oil in a 10ml bottle will contain 5000mg of CBD.
• A 30% CBD oil in a 10ml bottle will contain 3000mg of CBD.

When choosing, always check both the percentage and the total milligrams of CBD (we clearly indicate these for each product). The percentage shows how strong each drop is, and the milligrams tell you how much CBD you’re getting in the whole bottle.

The benefits of strong CBD oil

High-strength CBD oils can be more cost-effective, easier to take, and better suited for higher daily amounts:

✅ High-strength CBD saves you money – While the upfront cost is higher, strong CBD oils are usually cheaper per mg. For example, one 10ml bottle of 5000mg oil costs £185, compared to £334.50 for five 1000mg bottles, a saving of nearly 45%.

✅ Stronger products are easier to take – With strong CBD oils, you only need to take a few drops to get the right serving size. One drop of 50% oil gives 25mg, compared to 10 drops of a 5% oil (2.5mg per drop). It’s an easier way to increase your intake if needed, while staying within the UK’s daily limit of 70mg maximum.

The downsides of strong CBD oil

While we recommend strong CBD oils for many reasons, there are a couple of things to keep in mind:

⚠️ Higher upfront cost – Strong oils save money over time, but they do cost more at first, which may not suit every budget.

⚠️ Less flexible dosing – High-strength oils deliver more CBD per drop (e.g. 15–25 mg), which makes it harder to take smaller amounts. If you later want to reduce your intake, you might not be able to go lower than one drop, meaning you could end up using more CBD than you need.

2. Strongest CBD oils

After trying many high-strength CBD oils since 2016, we have found these four to be the most effective available in the UK today. Each one meets our standards for labelling, production, transparency and testing. All you need to do is choose the one that best suits your needs.

Strongest CBD oil: 50% CBD oil - Signature Collection

The Signature Collection 50% is the strongest full-spectrum CBD oil you’ll find in the UK today, and one of the best. Each 10ml bottle contains 5,000mg of CBD, CBG, and CBC, along with trace cannabinoids, including THC, and a rich profile of natural terpenes. These compounds work together to enhance each other’s benefits, so you'll probably need less oil to feel the same effect compared to broad-spectrum or isolate options.

What also sets it apart is the MCT C8 oil, chosen for its fast, efficient absorption. Each drop delivers 25 mg of active cannabinoids, giving you around 200 drops per bottle. At two drops per day, that’s a 100-day supply. And with a cost of just 3.7p per mg, it’s excellent value, equivalent to ten 5% bottles or five 10% bottles.

This standout oil is made by GreenLeaf Processing, the respected UK lab behind CBD Brothers. Since 2018, they’ve built a reputation for crafting all-natural, high-quality CBD using supercritical CO2 and rosin extraction from organically grown European hemp. It’s vegan, allergen-free, non-GMO, and rigorously tested, both in-house and by independent labs, to meet the highest standards from seed to shelf.

What our customers say: "Excellent product. Been really impressed with this and seems to be more cost-effective in the long run." - Neil W.

50% CBD oil specifications

Cannabinoid profile	Full-spectrum
Total CBD, CBG and CBC content	5000mg
Bottle size	10ml
Mg of CBD, CBG and CBC per drop	25mg
Cost per mg	3.7p per mg
Carrier oil	MCT oil
Extraction method	CO2 Supercritical
Third-party lab test available?	Yes
Organic credentials	Organically-grown hemp
Current price	£185

Biopurus 30% CBD oil

Biopurus 30% CBD oil is a rich, full-bodied oil made from whole-plant, full-spectrum extract. Each 10 ml bottle contains 3000 mg of CBD along with a wide range of other cannabinoids, terpenes, and natural micronutrients. It comes in a sturdy bottle with around 200 drops, each delivering 15 mg of CBD in a hemp seed carrier oil. Taken at two drops a day, this gives you a full 100-day supply.

The presence of so many useful plant substances adds to the potency of this luxurious oil. Together, a full-spectrum of cannabinoids works to produce a more significant result in your body, known as the entourage effect.

Biopurus is a small artisan producer with more than ten years of experience in cold-pressed oils. Their attention to detail shines through in every bottle. Their certified organic, whole-plant extracts are made to a consistently high standard and are regularly tested for quality and safety.

This oil is completely natural and produced to strict EU guidelines. It is vegan, kosher, GMO-free, and batch-tested by independent labs to ensure purity and consistency.

What our customers say: "This is an item I’ve bought many times over and rate very highly." - Lori H.

Biopurus 30% CBD oil specifications

Cannabinoid profile	Full-spectrum & whole plant
Total CBD content	3000mg
Bottle size	10ml
Mg of CBD per drop	15mg
Cost per mg	5.2p per mg
Carrier oil	Hemp seed oil
Extraction method	CO2 Supercritical
Third-party lab test available?	Yes
Organic credentials	Certified organic hemp seed oil base
Current price	£155.90

CannabiGold Intense 3000mg CBD oil

CannabiGold Intense 25% CBD oil  is a smooth, golden CBD oil with a gentle nutty flavour and none of the bitterness often found in strong oils. Each 12 ml bottle contains 3000mg of CBD in a hemp seed oil base and comes with a precision pump for easy use. One full bottle delivers 100 measured servings, each containing 30mg of CBD, perfect for a simple once-a-day routine that lasts over 3 months, 100 days.

Despite its strength, this oil is remarkably palatable and has become a favourite among those who want a high dose without the harsh taste. It’s full-spectrum and produced using supercritical CO2 extraction, keeping it rich in natural cannabinoids, terpenes and bioflavonoids.

CannabiGold is known for combining scientific precision with a commitment to quality. Grown and produced in the Vistula region of Poland, their hemp is carefully handled at every stage from field to bottle to ensure a clean, consistent and effective product. The result is a premium oil that delivers both taste and performance, backed by years of dedicated research and refinement.

What our customers say: "Truly the best strong CBD oil available in the UK. Highly recommend!" – Anonymous.

CannabiGold 3000mg CBD oil specifications

Cannabinoid profile	Full-spectrum
Total CBD content	3000mg
Bottle size	12ml
Mg of CBD per pump	30mg
Cost per mg	5.6p per mg
Carrier oil	Hemp seed oil
Extraction method	CO2 Supercritical
Third-party lab test available?	Yes
Organic credentials	Organically-grown hemp
Current price	£169.99

Strongest CBD spray - Love CBD Entourage

Sprays are one of the easiest ways to take CBD — quick to use, no mess, and ideal when you’re on the go. Instead of a mist, this spray delivers a fine jet of CBD-rich oil under your tongue for fast, efficient absorption.

Because sprays need to stay light to work properly, 10% is as strong as it gets, and Love CBD’s Entourage Spray delivers exactly that. Each 20ml bottle contains 2000mg of broad-spectrum CBD blended with smooth olive oil, giving it a clean, mild flavour with a hint of olive. You’ll get around 125 sprays per bottle, with 16mg of CBD in each one. At two sprays a day (32mg), that’s a 62-day supply: simple, strong, and long-lasting.

Love CBD is a family-run company based in Suffolk, founded by Phil and Dan Culbertson. Their carefully crafted blends combine legal hemp strains rich in cannabinoids and terpenes to enhance the entourage effect. While not certified organic, their products are made without pesticides, herbicides, synthetic fertilisers, or harmful chemicals.

This spray is vegan, GMO-free, and made from 100% natural ingredients. A great choice if you’re after strength, simplicity, and a smooth-tasting CBD experience.

Also in their range is the 7% Love CBD Entourage Spray with 1400mg of CBD in 20ml.

What our customers say: "I’ve been using Love CBD products for a while now and find that they are always of the best quality. It was the first brand I tried and still excellent and effective." - Heather W.

Love CBD 2000mg spray specifications

Cannabinoid profile	Broad-spectrum
Total CBD content	2000mg
Bottle size	20ml
Mg of CBD per spray	16mg
Cost per mg	4.9p per mg
Carrier oil	Olive oil
Extraction method	CO2 Supercritical
Third-party lab test available?	Yes
Organic credentials	Organically-grown hemp
Current price	£99.99

3. How to take a high-strength CBD oil

CBD affects everyone differently. Some people feel the benefits with just a small amount, while others may need to gradually build up to a higher daily intake.

Many who take high-strength CBD start with 30–50mg per day for the first week, then adjust to 45–70mg depending on how they feel. It’s important to listen to your body and find what works best for you.

CBD is known to be “biphasic”, meaning low and high amounts can have different effects. Like alcohol, a little may be calming, but too much can have the opposite effect. So if you find the benefits wearing off as you increase your dose, it may help to reduce it instead.

For best results, place the oil under your tongue and hold it there for 1–2 minutes before swallowing. This helps it absorb through the membrane under the tongue. Follow with a glass of water, and ideally some food containing a little fat, like oil or butter, to support better absorption.

4. Precautions

CBD is generally well tolerated, but some people may experience mild side effects such as a dry mouth, digestive discomfort, or changes in appetite. Very large servings can increase the risk of issues like low blood pressure, dizziness, headaches or, in rare cases, liver strain.

CBD can also interact with certain medications, so it’s important to check before use. This includes common drugs like anticoagulants, anticonvulsants, antibiotics, antidepressants, antifungals and beta-blockers.

To reduce the risk of side effects, the Food Standards Agency recommends no more than 70 mg of CBD per day. It should also be avoided if you’re on medication, pregnant or breastfeeding.

5. Why is high-strength CBD expensive?

High-strength CBD products cost more because they contain more cannabidiol and less filler. CBD is the most valuable part of the product, and its price reflects the cost of growing high-quality hemp, compliance with legal regulations, and the specialised equipment used to extract it.

This naturally raises the price, but in most cases, strong CBD oils provide more CBD for your money, making them a better value in the long term. With more CBD per bottle, you can take fewer drops for a stronger effect, or stretch it out over time with smaller servings.

Here to help

Whatever result you’re aiming for, there may be a high-strength option that fits. Feel free to get in touch if you’d like guidance on choosing the right one. For tailored advice, you can schedule a one-on-one call with our founder and research lead, Daniel, who has been working with CBD and other unique supplements like bioregulators since 2015.

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