Types of milk explained: from pasture to bottle

Raw, pasteurised, organic, whole and plant-based milk explained. A guide for curious households, with sources checked on 5 November 2026.

There is a small pleasure in opening a bottle of milk and finding the cream gathered at the top.

You can shake it back in, spoon a little into your coffee or save it for something delicious. Leave cream in the hands of someone who knows what to do with it, and you might end up with butter. Give milk the right culture and a little time, and you have yoghurt.

An everyday food, with an extraordinary number of possibilities.

For generations, people learnt these things in their kitchens. They knew which animal the milk came from, how it tasted through the seasons and what to do with it while it was fresh. Much of that knowledge has become less familiar, even as our choices have multiplied.

Now we stand in front of bottles and cartons trying to work out whether organic means grass-fed, why the cream has disappeared and whether the oat drink beside the milk provides anything like the same nourishment.

Then there is the question I find particularly interesting as a nutritionist: when someone says milk disagrees with them, which milk do they mean?

Come back with us to the animal, the field and the kitchen. The labels become much easier to understand from there.

It begins with the animal and the pasture

Watch a cow grazing and you are watching a remarkable partnership. Microorganisms in her rumen help turn fibrous plants into nourishment she can use. Grass, clover and other forages become part of the milk she produces.

Her breed, her diet, the season and her stage of lactation all influence that milk. They help shape its flavour and composition, including its fats. [5, 32]

This is one reason people become attached to a particular dairy. There is a character to the food that comes from a particular herd and place.

Fresh grazing and forage-based diets have been linked with higher proportions of omega-3 fats in milk in several studies. Feeding practices help explain some of the differences between organic and conventional milk. They also explain why well-managed pasture-based farms can produce similar milk across those categories. [5]

In winter, hay and silage preserve some of the growing season’s abundance. Farmers may also use concentrated feeds to meet their cows’ nutritional needs. Asking what the herd eats through the year tells you far more than a summer photograph alone.

Types of milk explained. What does organic milk mean?

Organic milk comes from farms following certified standards for feeding and animal care. These include organic feed, a prohibition on GM feed and access to pasture when conditions allow. Soil Association guidance specifies a minimum of 60% forage in the ration. [6]

The remaining feed can include suitable concentrates. For someone seeking a diet of entirely pasture and forage, schemes such as Pasture for Life provide a more specific assurance. [7]

You can picture the labels as answering different questions. Organic tells you about the farming standards. Whole tells you about fat. Pasteurised tells you about heat treatment. Non-homogenised tells you the cream can rise.

One bottle can carry all four descriptions.

The care of the cow reaches beyond feeding, too. Comfortable places to lie down, healthy feet, good udder care and thoughtful arrangements for calves are worth asking about when you get to know a dairy.

What is raw milk?

Raw milk is milk that has not undergone pasteurisation. It can come from cows, goats, sheep, buffalo or other dairy animals. It is commonly sold whole and non-homogenised, with its cream free to gather at the top.

People seek it out for its flavour, freshness and original character. For many, buying it also brings the farm back into the relationship: they know where their milk comes from and can speak to the people producing it.

Gazegill Organics in Lancashire describes its home-bred Old English Dairy Shorthorns and species-rich pasture. Hook & Son in East Sussex describes cows grazing when the ground allows and eating the farm’s preserved grass and clover through winter, with supplementary organic feed. [25, 27]

These details give a bottle a story. They also give us useful questions to ask about the food.

Both producers describe weekly milk testing. Hook & Son sets out its laboratory checks, including hygiene indicators and pathogens, alongside staff training and its food-safety procedures. Gazegill explains its careful udder preparation and weekly testing. [25, 26]

There is considerable care behind a fresh food sold this way.

Why are people interested in the benefits of raw milk?

Milk’s biology is richer than a few numbers on a nutrition panel.

It contains casein and whey proteins, fat droplets surrounded by membranes, milk sugar, minerals, vitamins and enzymes. Among its proteins are lactoferrin and immunoglobulins, which have attracted interest for their biological functions. Heating changes some of these components, depending on the temperature and time used. [9, 29]

For people drawn to raw milk, preserving more of this original activity is part of its appeal. The research offers several interesting avenues:

Heat-sensitive whey proteins. Researchers are studying how heating alters proteins involved in immune-related activity. Laboratory and animal experiments suggest some may help explain the allergy-related findings seen in human observational studies. [29]

The farm-milk association. In the GABRIELA study of more than 8,000 school-aged children, raw farm-milk consumption was associated with lower odds of asthma and allergic sensitisation. Certain whey proteins were associated with asthma outcomes; total bacterial counts were not. [11]

The whole food’s structure. Milk’s fat and proteins exist in an organised mixture. Research into processing and digestion is helping us understand why changes in that structure may matter. [13]

These are possible benefits under investigation. The human findings show associations, and the experiments help explore mechanisms; together they give us worthwhile questions.

Alongside this research are people’s everyday experiences: enjoying the taste, preferring the texture or finding a particular milk more comfortable to drink. Those observations can be the beginning of a useful conversation about the product and the person.

The traditional-food perspective

The Weston A. Price Foundation places full-fat dairy from pasture-fed animals, particularly raw and fermented dairy, within a wider tradition of nourishing foods. Its approach draws attention to butterfat, the animal’s diet and the kitchen skills that turn milk into cultured foods. [30]

That perspective encourages us to consider the whole journey. The quality of the pasture, the health of the animal and the way we prepare the food all belong in the picture.

It is an appealing invitation to become more involved in what we eat, from choosing a producer to making a first pot of yoghurt.

Homogenised versus non-homogenised milk: where did the cream go?

In milk left in its natural physical state, fat globules rise towards the surface. That is your cream line.

Homogenisation makes the fat globules smaller by passing milk through equipment under pressure. The smaller droplets stay more evenly distributed, producing a smooth, consistent drink. It changes the droplets and their surrounding structure; the individual fat molecules remain fat molecules. [1]

Non-homogenised milk keeps that familiar separation. A shake brings the cream back through the bottle.

You can buy it pasteurised, so anyone who enjoys the cream line has several choices. The two processes do different jobs: homogenisation changes the distribution of fat, while pasteurisation uses heat to reduce harmful microorganisms.

Pasteurised, sterilised and UHT milk explained

Heat treatment helped milk become a food that could travel through a much larger supply system.

As towns and cities grew, collection, transport and storage connected farms with customers further away. In Britain, processing depots supported large-scale pasteurisation. The equipment and controlled handling required capital, favouring businesses able to invest in that infrastructure. [24]

Milk-borne infections also drove change. Alongside pasteurisation, clean-milk initiatives worked to improve hygiene and animal health at source. Both developments form part of the milk story. [23, 28]

Today, the main heat treatments have different effects:

Pasteurisation reduces harmful microorganisms while retaining the milk’s protein, fat, lactose and minerals. Some vitamins and bioactive components are more heat-sensitive. The effects depend on the treatment, which helps explain why ordinary pasteurised milk and UHT milk can taste different to raw. [9, 10]

Filtered milk uses filtration as part of production. Some fresh milks are filtered to remove more microorganisms and extend refrigerated shelf life. Other products use filtration to concentrate protein. The description on the bottle helps explain the particular product.

Whole, semi-skimmed or skimmed milk?

The difference here is the amount of fat.

Whole milk contains at least 3.5% fat. Semi-skimmed contains 1.5–1.8%, while skimmed milk contains very little. Dairies can separate the cream and adjust how much is present to produce a consistent fat level. [1]

Removing cream reduces energy and nutrients associated with the fat, including vitamin A. Protein and calcium remain at broadly similar concentrations. Ordinary British milk supplies little vitamin D unless fortified. [8]

The fat content is one detail among several. A semi-skimmed milk can be organic; a whole milk can be UHT; a cream-top milk can be pasteurised.

Once you separate those descriptions, the shelf begins to make more sense.

Why does some milk agree with people more than others?

This is where the conversation becomes personal.

One person can enjoy cheese but gets uncomfortable after a large glass of milk. Another finds yoghurt easier. Someone else reports a difference after changing the farm or the type of milk they buy.

Useful clues include how much they drink, what they eat with it, whether the food is fermented and exactly what symptoms follow. Lactose, milk proteins and the person’s gut health can all be relevant.

Lactose intolerance and ancestry

Lactose is milk sugar. We digest it using lactase, an enzyme made at the lining of the small intestine.

Many people naturally make less lactase after childhood. Others inherit variants that keep production going into adult life. Those differences reflect a long relationship between human populations, dairying and evolution. Ancient evidence shows people were using dairy in Europe long before adult lactose digestion became widespread. [2, 4]

When lactose is poorly absorbed, it can draw water into the intestine and be fermented by bacteria, producing wind, bloating and loose stools. Tolerance varies with the amount consumed and individual circumstances.

If someone feels better with a particular milk, we can remain interested in that experience and explore what changed. The explanation may involve several features rather than lactose alone.

A1 and A2 milk

A1 and A2 describe variants of beta-casein, one of milk’s proteins. A single amino-acid difference affects the peptides released during digestion, which is why these proteins have attracted research interest.

Some trials report better digestive comfort with A2-only milk. Results vary: a 2026 pilot study found similar overall digestive symptoms between its two milks. [15, 16]

A2 may be a useful avenue to discuss for some people with digestive discomfort. It still contains lactose, and cows’ milk allergy requires a different approach. Breed names such as Jersey or Guernsey also leave uncertainty: a producer needs information about the herd’s genetics to make an A2-only claim.

When milk proteins are the problem

Milk allergy involves an immune response to milk proteins. Those proteins remain in raw, organic, lactose-free and A2 cows’ milk. Goat’s and sheep’s milk can also provoke reactions because their proteins are similar. [3]

Cow, goat, sheep and buffalo: milk’s many expressions

There is a wonderful variety beyond the familiar bottle.

Goat’s milk brings its own flavour and composition. Sheep’s milk is particularly rich in protein and fat, helping make cheeses such as Roquefort and pecorino distinctive. Buffalo milk is known for its creaminess and its place in mozzarella. Cow’s milk itself varies with breed, feed and season. [32]

Different milks offer different kitchen pleasures. Someone exploring them for digestive reasons still needs to consider lactose and allergy, which can cross these species boundaries.

The iodine connection you might never have considered

Milk is an important iodine source in Britain. Some of that story sits in the cow’s feed; another part involves iodine-containing products used in teat disinfection. Research shows both can influence the amount reaching the milk. [17]

It is an unexpected connection between a farm routine and a nutrient on our plates.

Amounts vary with production practices and season. Recent UK testing found iodine throughout the milk categories sampled, with differences from older measurements rather than one uniform trend. Organic and conventional milk can differ too. [18, 19]

This becomes particularly useful knowledge when replacing dairy. Calcium fortification on a plant-drink carton answers one question. Iodine deserves a look of its own.

Choosing a dairy-free milk: turn the carton around

The almond on the front might catch your eye. The ingredients on the back tell you what you are actually pouring.

Some almond drinks contain rice as their main plant ingredient. Oat drinks can contain added oils, and a “no added sugar” claim can sit beside several grams of sugar on the nutrition panel. Recipes vary even within the same brand.

This becomes useful knowledge when you compare real products.

Three cartons, three different recipes

Examples checked against manufacturers’ UK product pages on 5 November 2026. These are specific products, rather than endorsements or descriptions of every drink in each range. Check the carton for changes. Rude Health labels this Almond Drink for adults and children from five years onwards. [33–35]

Two products called almond drink can therefore be very different foods. The almond percentage, the rice, the sugar and the added oil all deserve a look.

What I would look for on the label

Start with the base ingredient. Check the percentage of nuts, oats or other ingredients and whether rice forms part of the blend. For a child under five, rice-based drinks are unsuitable because of arsenic concerns; check mixed drinks as well as cartons labelled rice drink. [22, 33]

Read the sugar figure as well as the claim. Cereal processing can break starch down into sugars. You may find those sugars in the finished drink even when sugar or syrup does not appear in the ingredients. Compare per 100 ml, then consider the amount actually used. Dairy milk’s naturally occurring lactose also appears under total sugars, so the number alone does not describe the kind of sugar or the drink’s whole nutritional value. [8, 20]

Notice oils and other additions. Rapeseed oil, sunflower oil, gums and acidity regulators can help create body, stability or a good foam. If you prefer a simpler recipe without added oils, look for a product that meets that preference. The exact ingredient and amount matter when assessing a recipe.

Check nourishment as well as sweetness. Almond, oat and coconut drinks are often low in protein; some pea-based products supply more. A creamy texture can come from added fat while the protein content remains modest. Energy content matters too, particularly for children with small appetites.

“Fortified” means vitamins and minerals have been added during manufacture. We tend to favour simple, unfortified drinks and look at nourishment across the whole diet. If you’re dairy-free or vegan, it’s worth checking where nutrients such as calcium, iodine and B12 are coming from. For a vegan diet, a reliable B12 source is essential, through a suitable supplement or fortified foods. [20, 36]

What about soya milk?

Soya drinks would not be my recommendation for a child’s everyday milk replacement. I would rather look at the child’s whole diet and choose a replacement deliberately than make soya the automatic next step after dairy.

Soya does contain useful protein. It also contains isoflavones, which have hormonal activity. The 2025 UK assessment identified a potential concern about high isoflavone exposure in young children consuming substantial amounts of soya, particularly on vegan diets. That finding concerns the amount and the whole diet; it does not establish that every serving causes harm. [20]

Someone already using a soya drink can review how much they consume and what other soya foods they eat. Age, allergy and the nutrients being replaced belong in that conversation too.

Bringing milk back into the kitchen

A pot of yoghurt, a spoonful of cultured cream, a piece of well-made cheese: each carries some of the knowledge people developed through living closely with food.

Fermentation changes milk’s flavour, acidity and texture, and can reduce its lactose. Some people find particular fermented dairy foods easier to enjoy than liquid milk. The amount of lactose remaining depends on the product. [2]

There is satisfaction in understanding even a little of this. You begin to notice the cream line, ask what a herd eats in winter, or recognise why two bottles with the same coloured lid might be quite different.

Next time you buy milk, choose one thing you would like to know about it. Perhaps where it comes from, whether it is homogenised, or what the cows eat. A label, a farm website or a conversation with a producer can open the door.

An ordinary bottle becomes rather more interesting when you can see the field, the animal and the craft behind it.

 

Sources and further reading

1. Dairy UK: milk types, standardisation and homogenisation. Industry explanation of processing.

2. NHS: lactose intolerance.

3. Cambridge University Hospitals: milk allergy.

4. Evershed and colleagues, 2022: dairying and lactase persistence in Europe; UCL research explanation.

5. Milk fatty acids and farming practices; pasture feeding in organic and conventional systems.

6. Soil Association: organic milk and dairy. Certifier’s account of its standards.

7. Pasture for Life: certification and feeding.

8. Dairy UK: milk nutrient composition.

9. EFSA: milk heat treatments and verification of pasteurisation.

10. Milk pasteurisation and vitamins: research synthesis.

11. GABRIELA study: farm milk and childhood asthma/atopy.

12. Food Standards Agency: raw drinking milk, risk and sales rules; business guidance updated June 2026.

13. Milk processing and laboratory digestion study.

14. Stanford: randomised raw-milk lactose-intolerance trial.

15. A2 milk crossover trial, 2024.

16. A1-free versus conventional milk: 2026 pilot trial.

17. Dietary iodine and teat-dipping experiment.

18. UK milk nutrient analysis, published 2025.

19. Organic, conventional and UHT milk iodine study.

20. SACN/COT plant-drinks assessment, 2025.

21. NHS: dairy and alternatives.

22. NHS: drinks for babies and young children.

23. Museum of English Rural Life: archival history of clean-milk production and pasteurisation.

24. Milk in Motion: Logistical Geographies in Twentieth-Century Britain. Historical research on British milk distribution, processing depots and capital investment.

25. Gazegill Organics: herd, hygiene and weekly testing.

26. Hook & Son: quality control and weekly laboratory checks.

27. Hook & Son: pasture, winter forage and supplementary feeding.

28. Real Milk: Pasteurize or Certify. historical research on swill milk and certified milk.

29. Milk & Health: heat treatment and milk’s biological character; Abbring and colleagues, 2020: heat-sensitive whey proteins and an experimental mouse model.

30. Weston A. Price Foundation: traditional-food guidance; its discussion of whey proteins and asthma research.

31. Randomised trial comparing homogenised and non-homogenised milk; clinical crossover study of processing and gastrointestinal symptoms.

32. FAO: milk composition across animal species.

33. Rude Health Almond Drink: UK ingredients, nutrition and age suitability.

34. Plenish standard Almond M*lk: ingredients and nutrition.

35. Oatly Oat Drink Whole, UK 1 litre: ingredients and nutrition.

36. Vegan nutrition: B12, calcium and other nutrients; iodine sources.

37. Calcium: food sources and absorption.