The Tub, the Label and the Patch Test: CBD Balms for UK Beginners

So you've got your head around a dropper bottle, more or less. You know roughly what a milligram is, you've squinted at a batch code, and you've stopped expecting CBD oil to taste like anything pleasant. Then someone hands you a tub of balm and the rules seem to change overnight.

They don't, really. A balm is just a different delivery format, and most of the same boring questions still apply. What's actually in it? How much? Who checked? The only real difference is that you're now dealing with cosmetics labelling rather than food supplements, which changes a few things worth knowing before you spend £25 on something that smells like a spa and does very little.

A tub is not a weaker bottle

The first thing to get straight: rubbing something on your skin isn't a watered-down version of swallowing a capsule. It's a separate category with its own rules, its own labelling conventions, and its own honest limits.

CBD topicals sold in the UK are generally regulated as cosmetics. That means they're about external use, appearance and condition of the skin, and they are not medicines. You'll see them in Boots, on high street shelves, in independent health shops and in plenty of online stores, and none of them should be claiming to treat, cure or prevent anything. If a tub promises to fix a diagnosed condition, that's a marketing problem, not a medical breakthrough.

The other side of that coin is worth saying plainly: because topicals sit outside the FSA's novel food register (which covers ingestibles), you won't find your balm on that list. That isn't a red flag on its own, but it does mean the register check you may have learned for oils won't help you here. You'll have to do the reading yourself.

What the label will and won't tell you

A decent CBD balm label usually gives you a few useful things: the amount of CBD in the tub (often in milligrams), the total weight in grams or millilitres, the carrier ingredients, a batch number, and a best-before date. Some brands go further and point to a lab report.

What it rarely tells you is how much you're actually getting per fingertip, because that depends entirely on how thick the product is and how much you scoop. A 500mg tub sounds impressive until you realise it's 100g of balm and you're using a pea-sized amount at a time. That's not a con, but it does mean comparing two tubs on the headline milligram figure alone is close to meaningless.

The maths that actually helps is cost per gram of product, and milligrams of CBD per gram of product. Two tubs, both 50g, both £20, one with 250mg and one with 500mg — that's a fair comparison. Two tubs at wildly different sizes are not.

Hemp seed oil in a CBD costume

This is the big one, and it catches people out constantly.

Hemp seed oil is a lovely enough ingredient. It's nourishing, it's cheap, and it appears in a huge number of balms and moisturisers. What it is not is CBD. Hemp seed oil is pressed from seeds, which contain essentially no cannabinoids. It can sit on a label next to words like "hemp", "cannabis sativa seed oil" and a picture of a leaf, and look for all the world like the active thing you were buying.

A genuinely CBD-containing balm will normally state cannabidiol, full-spectrum, broad-spectrum, or a specific milligram figure somewhere in the ingredients or the panel. If the only hemp reference is the seed oil, you're buying a nice moisturiser with good branding. That's fine, if that's what you wanted. It's less fine if you paid a premium for something that isn't there.

Have a look at our jargon filter guide if you want a wider list of words to treat with suspicion.

Please do the patch test

It sounds fussy. It isn't. Any new topical — CBD or otherwise — can irritate your skin, and balms often contain essential oils, beeswax, shea, coconut derivatives and fragrance, any of which can disagree with you.

Apply a small amount to the inside of your wrist or forearm, leave it 24 hours, and see what happens. If it stings, itches, reddens or comes up in bumps, stop. Don't layer it over broken skin, don't apply it near your eyes, and if you're pregnant, breastfeeding, or using prescription skin treatments, have a quick word with a pharmacist first. This is the least glamorous paragraph in the article and the most useful one.

Wording that should slow you down

Most CBD balms are sold by perfectly reasonable companies making modest claims. The ones to watch are the ones doing the most shouting. A few phrases that should make you put the tub back on the shelf and think:

• Anything promising to "cure", "treat" or "heal" a named condition. That's a medicines claim and it doesn't belong on a cosmetic.
• Vague percentages with no milligram figure attached. "10% CBD" means nothing without knowing 10% of what.
• Lab report links that go nowhere, or PDFs dated three years ago.
• Testimonials used in place of an ingredients list.
• Prices that only make sense if you assume the tub will last six months.

How to compare two tubs fairly

Line them up and ask the same four questions of each. How many grams am I getting, and how many milligrams of CBD are in those grams? What's the carrier — is it a balm that suits my skin, or a scented one that won't? Is there a batch code and a date? And can I find a lab report without emailing anyone?

If a product answers all four clearly, it's probably being sold by someone who knows what they're doing. If it dodges two or three, you're paying for packaging.

Start small. A modest tub, a patch test, a couple of weeks of actually using it. That's a much better use of your money than a jumbo jar and a hopeful feeling. Balms are a perfectly sensible entry point into CBD — just read the label before you read the reviews.