What Strength CBD Oil to Use? | Valley CBD
CBD oil strength can look confusing because labels often show several numbers at once: a percentage, a total amount in milligrams and a bottle size. The easiest way to compare oils is to turn those figures into one clear measurement: milligrams of CBD per millilitre (mg/ml).
This guide explains how CBD oil strength works, how 10%, 20%, 30% and 40% compare, and why concentration is different from daily intake. It is a strength guide, not a personalised dosing recommendation.
What Does CBD Oil Strength Mean?
CBD oil strength describes how concentrated the CBD is in the liquid. A higher percentage means more CBD is present in each millilitre of oil.
For Valley CBD’s current 30ml range, the calculation is straightforward:
- 10% CBD oil: 3,000mg in 30ml = 100mg/ml
- 20% CBD oil: 6,000mg in 30ml = 200mg/ml
- 30% CBD oil: 9,000mg in 30ml = 300mg/ml
- 40% CBD oil: 12,000mg in 30ml = 400mg/ml
Those figures describe concentration only. They do not mean a higher-strength oil is more appropriate for a particular health condition, and they do not create a recommendation to consume more CBD.
CBD Percentage vs Milligrams: What Is the Difference?
The percentage and the milligram figure describe related but different things.
Total milligrams tell you how much CBD is stated across the entire bottle. Percentage tells you how concentrated the liquid is. Bottle size connects the two.
For example, a 6,000mg CBD oil in a 30ml bottle contains:
6,000mg ÷ 30ml = 200mg/ml, commonly expressed as 20%.
That is why comparing only the biggest milligram number can be misleading. A product with fewer total milligrams can still be more concentrated if the bottle is much smaller.
Why mg/ml Is the Clearest Way to Compare CBD Oil Strength
Using mg/ml gives you a common unit that works across different bottle sizes. It lets you compare the actual concentration without relying on marketing terms such as “strong”, “extra strength” or “maximum strength”.
If one bottle contains 6,000mg in 30ml and another contains 6,000mg in 10ml, the total CBD is the same but the concentration is very different:
- 6,000mg in 30ml = 200mg/ml
- 6,000mg in 10ml = 600mg/ml
So when comparing products, always look at total CBD + bottle size + mg/ml, not total milligrams alone.
10% vs 20% vs 30% vs 40% CBD Oil
| Strength | Total stated CBD | Bottle | CBD per ml |
|---|---|---|---|
| 10% | 3,000mg | 30ml | 100mg/ml |
| 20% | 6,000mg | 30ml | 200mg/ml |
| 30% | 9,000mg | 30ml | 300mg/ml |
| 40% | 12,000mg | 30ml | 400mg/ml |
Within the current Valley CBD range, 40% is our highest-strength oil. That is a factual statement about our own range, not a claim that it is the highest concentration sold anywhere in the UK.
Is a Higher CBD Percentage “Better”?
No percentage is automatically better. A higher percentage simply means a higher concentration of CBD per ml. Product quality and suitability involve other factors as well, including accurate labelling, ingredient transparency, extract type, carrier oil and the quality of supporting laboratory information.
A useful buying comparison therefore asks two different questions:
- How concentrated is the oil? Check mg/ml.
- What is actually in the product? Check the ingredient list, extract type and available laboratory documents.
CBD Isolate, Broad Spectrum and Full Spectrum Are Not Strength Levels
Extract type and strength are separate. An oil can be 20% whether it uses CBD isolate or a broader hemp extract, provided the stated CBD concentration is 200mg/ml.
The current Valley CBD oils are formulated using CBD isolate with an MCT-based carrier. “Isolate” describes the CBD ingredient type; “10%, 20%, 30% or 40%” describes the CBD concentration.
If you are comparing products from different brands, check both pieces of information rather than assuming a higher percentage tells you the extract type.
Why We Prefer ml Measurements to Fixed “mg Per Drop” Claims
Individual drop size can vary between droppers, liquids and dispensing technique. That makes a fixed “one drop always equals X mg” statement less reliable than a concentration measured per ml.
Where a dropper has volume markings, those ml markings can provide a clearer way to understand how much liquid is being measured. Always follow the product label and measuring instructions supplied with the bottle.
For an explanation of practical use rather than strength maths, see our How to Use CBD Oil UK guide.
CBD Strength Is Not the Same as Daily Intake
This is the most important distinction in this guide. A bottle can be highly concentrated while the recommended maximum daily intake remains much lower.
Current UK Food Standards Agency guidance advises healthy adults to limit consumption of CBD from food to 10mg per day. The FSA also advises people under 18, those who are pregnant, breastfeeding or trying to conceive, and people taking medication to avoid CBD unless under medical direction.
Read the current UK CBD consumer guidance on GOV.UK.
That means a 40% product should not be interpreted as permission to consume a higher daily amount. Concentration and intake are separate measurements.
How to Compare CBD Oil Strength Before Buying
A simple checklist is enough:
- Check the total CBD: for example 3,000mg, 6,000mg, 9,000mg or 12,000mg.
- Check the bottle size: for example 30ml.
- Calculate mg/ml: total CBD divided by bottle volume.
- Check the percentage: make sure it agrees with the stated mg/ml.
- Check the extract type: isolate, broad spectrum or full spectrum.
- Read the ingredient list and laboratory information: understand what was actually tested.
- Separate product strength from intake: follow current FSA guidance and the product label.
You can also use the Valley CBD strength calculator to compare percentage, total milligrams and mg/ml. It is a concentration tool, not a personalised medical dosing calculator.
Frequently Asked Questions About CBD Oil Strength
What does 10% CBD oil mean?
In Valley CBD’s 30ml format, 10% corresponds to 3,000mg total stated CBD, or 100mg/ml.
What does 20% CBD oil mean?
In a 30ml bottle containing 6,000mg CBD, 20% corresponds to 200mg/ml. Our separate 6000mg CBD oil guide explains this calculation in more detail.
What does 40% CBD oil mean?
For a 30ml bottle containing 12,000mg CBD, 40% corresponds to 400mg/ml.
Does a higher percentage mean I should take more CBD?
No. Percentage describes product concentration. It is not a daily intake recommendation.
Is 40% the strongest CBD oil in the UK?
Valley CBD describes 40% as the highest-strength oil in its current range. Other UK sellers may offer different concentrations, so we do not make an absolute market-wide “strongest in the UK” claim.
Should I compare CBD by drops?
Drop counts can be approximate because individual droplet size varies. Mg/ml and measured liquid volume provide a clearer basis for comparing concentration.
Bottom Line
The simplest way to understand CBD oil strength is to use mg per ml. In Valley CBD’s current 30ml range, 10% = 100mg/ml, 20% = 200mg/ml, 30% = 300mg/ml and 40% = 400mg/ml. Those numbers tell you how concentrated each oil is; they do not tell you which product will produce a particular health outcome or how much CBD an individual should consume.