Froth, Flavour and the Extra 70p: Hemp Milk vs Oat Milk in a 2026 UK Coffee Test

Plant milk in coffee used to be a niche request. Now it is a normal part of UK café life, and the choice is no longer just soy or oat. Hemp milk is creeping onto more shelves and menus, often with a quiet suggestion that it is the greener, more natural option. But is it actually better in a flat white? And is it worth the extra money?

We compared hemp milk and oat milk in home kitchens and cafés, using barista-style cartons where possible. This is not a lab test. It is a practical taste-and-budget check for people who care about coffee, cost and the environment, but do not want to be sold a story.

The test: two cartons, one coffee habit

We looked at unsweetened and barista versions of both drinks, made espresso at home with a simple frother, and ordered the same size flat white in a handful of UK cafés. We scored froth, flavour, nutrition, price and environmental claims out of five. The aim was not to crown a universal winner. It was to work out when hemp milk earns its place and when oat still makes more sense.

One quick clarification: hemp milk is made from hemp seeds, not from CBD. It will not get you high, and it is not a medicine. It is a plant drink with a nutty, slightly earthy flavour. Think of it as a cousin of oat milk, not a wellness shortcut.

Froth and texture: oat still has the barista advantage

Oat milk has had years to perfect its coffee game. Barista oat drinks are usually formulated with added oils and stabilisers to create stable microfoam, and they hold up well in a flat white or latte. They are forgiving if the steam wand is a bit aggressive, and they do not split easily in hotter coffee.

Hemp milk is improving, but it is less consistent. Standard hemp milk can froth a little, then turn thin and watery. Barista hemp blends do better, with a creamier texture and more stability, but they are still less common and less predictable. In our home test, hemp milk produced a decent foam that faded faster than oat. In cafés, the hemp flat white was pleasant but noticeably lighter, with less of that velvety mouthfeel.

Score: oat 4.5/5, hemp 3/5. If your coffee ritual depends on latte art, oat is still the safer pair of hands.

Taste: creamy and neutral versus nutty and earthy

Oat milk is the crowd-pleaser. It tastes creamy, slightly sweet and fairly neutral, which is why it works with everything from a light roast to a strong dark roast. It can round off harsh notes in cheaper coffee, which is not always a bad thing.

Hemp milk has more personality. It tastes nutty, sometimes grassy or earthy, and it can be a little savoury. In a dark-roast coffee or a chai, that works nicely. In a delicate light roast, it can overpower the coffee and leave a slightly dry finish. If you like black coffee and want the milk to stay in the background, hemp may not be your first choice. If you like a nutty edge and want something different from oat, it is worth a try.

Score: oat 4/5, hemp 3.5/5. It is not worse. It is just more divisive.

Nutrition: check the carton, not the hype

Hemp milk is often marketed as a protein drink, but the numbers vary widely. Some cartons have around 2g of protein per 100ml; others have less. It usually brings some unsaturated fat, including omega-3 ALA, and it is often lower in carbohydrates than oat milk. Oat milk tends to be higher in carbs and can contain added oils in barista versions, but it also offers some fibre and is usually fortified with calcium, vitamin D and vitamin B12.

Neither drink is automatically healthier. Oat milk can be a good fit for people who want a creamy texture and easy frothing. Hemp milk can suit people who want a lower-carb option or a different fat profile. The important thing is to read the label for fortification, sugar and additives. A hemp milk with no calcium or B12 is not a nutritional upgrade just because it says hemp on the carton.

Score: oat 3.5/5, hemp 3.5/5. It depends on the brand and what you need.

Price: the extra 70p question

This is where hemp milk often loses. In UK shops, own-brand oat milk can be very cheap, and barista oat is widely available at mid-range prices. Hemp milk is usually a premium product. You may pay £2.50 to £3.50 per litre, sometimes more, compared with £1.50 to £2.50 for a standard oat milk. In cafés, some still charge 30p to 70p extra for plant milk, while others have dropped the surcharge. If hemp is the only plant milk on the menu, it may carry a premium.

If you drink one coffee a day, that extra cost adds up. If you use hemp milk occasionally for a smoothie or a weekend coffee, it is easier to justify. The question is not whether hemp milk is nice. It often is. The question is whether you like it enough to pay the difference every week.

Score: oat 4.5/5, hemp 2.5/5.

Green claims: read past the leaf

Oat milk has a strong environmental story in the UK because oats can be grown here, use relatively little water and fit into crop rotations. But the carton, processing and transport still matter. Hemp has a different story: it is a hardy crop, can grow with fewer pesticides, and has deep roots that can help soil health. That does not make every carton of hemp milk a green hero. The seeds may be imported, the drink may be processed in another country, and the carton may not be widely recycled.

Both drinks have a lower climate impact than dairy milk in most studies, but neither is impact-free. Be sceptical of any brand that leans on a single leaf icon and says nothing about sourcing, packaging or transport. The greenest option is usually the one with fewer air miles, sensible packaging and a brand that answers questions clearly.

Score: oat 4/5, hemp 3.5/5. Oat has the local-growing advantage in the UK; hemp has the agronomic promise, but the supply chain is not always transparent.

The Hemphorus scorecard

Use this yourself, but change the weightings. If froth is everything, oat wins. If you want a lower-carb drink and like the flavour, hemp may be worth it. If budget is tight, oat is the sensible default.

When hemp milk is worth the extra cost

Hemp milk earns its premium when you actually like the taste, when you want a lower-carb plant milk, or when you want to support hemp farming and a more diverse plant-milk shelf. It can also be lovely in a chai, a smoothie or a darker-roast coffee where its nutty notes have room to breathe. If you are curious, buy the smallest carton first and try it in a coffee you already know well.

When oat still wins

Oat still wins for barista-style coffee, for budget, and for people who want a neutral, creamy texture that does not argue with the coffee. It is the reliable choice in most UK cafés, and it is usually the cheaper one at home. That does not make it boring. It makes it useful.

The bottom line

Hemp milk is not a magic eco-milk, and it is not a straight swap for oat. It is a tasty, slightly divisive plant drink with a decent story and a higher price tag. Oat remains the easy crowd-pleaser. Try both, read the carton, and ignore any brand that promises the earth without showing its workings.