How Strong Should Your CBD Oil Be? A UK Buyer’s Guide

People searching for the “right” CBD oil strength are usually asking two different questions at once: how much CBD should I take each day? and which bottle should I buy? They’re related, but they’re not the same thing — and mixing them up is how people end up with a bottle that doesn’t suit them. Our dosage guide answers the first question in depth. This guide answers the second.

CBD oil strengths explained: what the number on the bottle means

The strength on a CBD oil label — 500mg, 1000mg, 4000mg — is the total CBD in the bottle, not a dose. All our oils come in 30ml bottles, so the concentration works out like this:

• 500mg — about 17mg of CBD per ml
• 1000mg — about 33mg per ml
• 2000mg — about 67mg per ml
• 3000mg — 100mg per ml
• 4000mg — about 133mg per ml

Here’s the part that surprises people: you can take the same daily amount of CBD from any of these bottles. A 20mg day is a full pipette of the 500mg oil or a few drops of the 4000mg. The strength you buy doesn’t decide how much CBD you take — it decides how many drops that takes, and what each milligram costs you. Every HempWell bottle includes a graduated pipette (still a rarity in this market), so measuring stays precise whichever strength you choose.

The three questions that actually decide it

1. Do you know your daily amount yet?

If you’re new to CBD, you don’t — and that’s fine. Newcomers do best starting with a lower-strength bottle and a few weeks of consistent use, increasing gradually until they notice where their level is. That’s exactly what our starter packs are built for: meaningful sample sizes at sensible prices, with a guide that walks you through the process.

2. How much are you taking per day?

Once you’ve settled at a daily amount, the arithmetic takes over. At 30mg a day, a 500mg bottle lasts barely a fortnight; a 2000mg bottle lasts over two months. As a rule of thumb: under 15mg a day, a 500–1000mg bottle is plenty; between 15mg and 40mg, look at 1000–2000mg; above that, you’re shopping in high strength territory.

3. What does each milligram cost?

Stronger bottles are better value per milligram — ours work out roughly 35–40% cheaper per mg at 4000mg than at 1000mg. If your daily amount is established and isn’t changing, buying strong and dosing small is simply the economical way to do it.

Does a stronger oil “work better”?

No — and it’s worth being straight about this. What matters is the amount of CBD you take and how consistently you take it, not the concentration of the bottle it came from. More is also not automatically better: the FSA advises healthy adults not to exceed 70mg of CBD per day, and research doesn’t show benefits stacking up simply by taking more. Start low, increase gradually, give each level a couple of weeks — and if you take prescription medication, talk to your GP or pharmacist first, because CBD can interact with some medicines.

Which range: broad spectrum or pure isolate?

Strength picked, one choice left. Our Broad Spectrum oils keep the hemp plant’s other cannabinoids and terpenes (with THC removed) on a hemp seed oil carrier — many customers prefer whole-plant extracts, though the “entourage effect” remains anecdotal. Our Pure CBD oils are CBD isolate on organic MCT coconut oil: flavour-neutral and single-compound. Both are 0% THC and independently lab tested, with reports on every product page. The full comparison lives in our isolate vs broad spectrum guide, and if workplace testing is on your mind, see CBD and drugs tests.

The quick answer

• New to CBD? Start with a 500mg oil or a starter pack, and use the first few weeks to find your daily amount.
• Settled under 15mg a day? 500–1000mg bottles suit you fine.
• Taking 15–40mg daily? 1000–2000mg is your bracket.
• Established at more than that? The high strength range (2000–4000mg) gives you fewer drops per dose and the lowest cost per milligram.

Every oil we sell is made at our laboratory in York Science Park from our own EU-certified hemp, developed with guidance from our Scientific Advisor, Professor Mike Barnes. If you’d rather talk it through with a person, call us on 0800 772 0508 or drop into our York, Brighton or Harrogate shops — helping people choose well is most of what the team does. Browse the full CBD oil collection to compare every strength side by side.