Is Linseed the Same as Flaxseed? A UK Guide
Is linseed the same as flaxseed? Yes. Linseed and flaxseed are the same seed, from the flax plant (Linum usitatissimum). "Linseed" is the usual UK name and "flaxseed" the US one. Golden and brown linseed differ mainly in colour and flavour, and milled linseed is simply the whole seed ground. Per 100g it has about 1.6g carbohydrate as UK labels count it.
At a glance
- Same seedlinseed (UK) and flaxseed (US)
- 1.6gcarbohydrate per 100g, fibre excluded (USDA)
- 27.3gfibre per 100g (USDA)
- 1 + 31 tbsp milled linseed + 3 tbsp water = 1 flax egg
On this page
If you've picked up an American recipe that asks for "flaxseed" or "flax meal", you might wonder whether the bag of linseed in a British supermarket is the right thing. It is. The two names describe exactly the same seed.
This guide sticks to the naming question: what each label means, how golden, brown, whole and milled linseed differ, how many carbs linseed has, and how to use it in low-carb baking. If you want to know whether flaxseed fits a keto diet, our guide Is flaxseed keto friendly? covers that question.
Is linseed the same as flaxseed? One plant, two names
Flax (Linum usitatissimum) is one of the oldest cultivated crops. Its stems give the fibre that's spun into linen, and its small, glossy seeds are what we call linseed or flaxseed. The oil pressed from the seeds has long been called linseed oil.
- Linseed is the name you'll see on most UK packs, in supermarkets and health food shops.
- Flaxseed (or just "flax") is the usual name in the US and Canada, so it turns up in most American and Canadian recipes.
- Flax meal, ground flaxseed and milled linseed all mean the same thing: the seed ground to a coarse powder.
Some growers use "flax" for varieties bred for fibre and "linseed" for varieties bred for seed and oil, but in the kitchen the names are interchangeable. If a US recipe asks for a tablespoon of ground flaxseed, use a tablespoon of milled linseed.
Linseed names and forms compared
Most of the confusion comes from the different forms on the shelf rather than the names themselves.
| Name | Also called | What it is | Best for |
|---|---|---|---|
| Linseed | Flaxseed | Whole seed of the flax plant | Crackers, toppings |
| Golden linseed | Golden or yellow flax | Light-coloured seed, milder taste | Pale bakes, cookies |
| Brown linseed | Brown flax | Darker seed, earthier taste | Crackers, seeded bread |
| Milled linseed | Flax meal, ground flaxseed | Whole seed, ground | Binding, flax eggs |
| Linseed oil (food) | Flaxseed oil | Cold-pressed oil from the seed | Dressings, drizzling |
| Boiled linseed oil | BLO | Oil with added drying agents | Wood finishing only |
Names as used on UK and US packs. Boiled linseed oil is a DIY product, not a food.
The linseed oil sold in DIY shops for wood is a different product from the flaxseed oil sold for food. Boiled linseed oil usually contains metallic drying agents such as cobalt and manganese salts, so it isn't food safe. For the kitchen, buy oil labelled as food, often sold as cold-pressed flaxseed oil.
Golden vs brown linseed
Both colours come from the same species. Golden linseed is simply a lighter-seeded type, and both are sold whole or milled. Canadian Food Focus says golden and brown flaxseed can be used interchangeably, and King Arthur Baking notes that brown flax meal gives a darker colour, a flecked look and a stronger, wholegrain-style flavour.
- Choose golden linseed for cookies, pale cakes, pancakes and anything where you want the seed to blend in. It has a milder, slightly nutty taste.
- Choose brown linseed for crackers, seeded loaves and savoury bakes, where a darker colour and earthier flavour suit the recipe.
In practice you can swap one for the other weight for weight. The difference is in how the bake looks and tastes, not how it behaves.
Carbs in linseed
The UK's CoFID dataset doesn't have an entry for linseed, so we've used the US Department of Agriculture's FoodData Central entry "Seeds, flaxseed" (FDC ID 169414). US figures count fibre inside total carbohydrate, while UK labels list it separately, so we've subtracted the fibre to show carbohydrate the way a UK label would.
| Amount | Carbs | Fibre | Fat | Energy |
|---|---|---|---|---|
| 100g | 1.6g | 27.3g | 42.2g | 534 kcal |
| 1 tbsp milled (7g) | 0.1g | 1.9g | 3.0g | 37 kcal |
| 1 tbsp whole (10.3g) | 0.2g | 2.8g | 4.3g | 55 kcal |
Source: USDA FoodData Central, SR Legacy, "Seeds, flaxseed" (FDC ID 169414), checked 25 October 2026. Carbohydrate excludes fibre, as on UK labels. Tablespoon weights are USDA's portion weights; weigh your own if you can. Per-portion figures are our own calculations.
The maths: USDA lists 28.88g of total carbohydrate and 27.3g of fibre per 100g, so 28.88 − 27.3 = 1.58g, about 1.6g of carbohydrate as UK labels count it. A level tablespoon of milled linseed weighs about 7g, so it has 1.58 × 7 ÷ 100 = 0.11g of carbohydrate and 27.3 × 7 ÷ 100 = 1.9g of fibre. A 30g portion has 1.58 × 30 ÷ 100 = about 0.5g of carbohydrate. USDA also gives 18.3g of protein per 100g.
Linseed is mostly fat and fibre, which is why it's so useful in low-carb baking. Bear in mind that it's also energy-dense: 534 kcal per 100g, much the same as nuts.
How to use linseed in keto baking
Linseed has no gluten-forming proteins and very little starch, so it can't replace wheat flour on its own. What it does well is add body, bind ingredients and give crunch. Whether you use it whole or milled makes the biggest difference.
Whole linseed: crunch and texture
Whole seeds keep their shape, so they add crunch to crackers, a seeded finish to loaves and texture to granola-style mixes. Our keto seed crackers use 60g of whole golden linseed with sunflower, pumpkin and sesame seeds, held together with psyllium husk powder and oat fibre.
Milled linseed: binding and moisture
Grinding breaks the seed coat, so milled linseed soaks up liquid and turns thick and slightly gel-like. That makes it a handy binder in muffins, cookies, pancakes and flatbreads, and it's the form to use when a US recipe asks for "flax meal". You can buy it milled or grind whole seeds yourself in a clean, dry spice or coffee grinder, a tablespoon or two at a time.
How to make a flax egg
A flax egg replaces one egg in many bakes. King Arthur Baking's method:
- Stir 1 tablespoon of milled linseed (flax meal) into 3 tablespoons (42g) of water.
- Leave it for 5 to 10 minutes, until thick and gelatinous.
- Use it in place of one egg.
Flax eggs add body and help bind, but they don't trap air the way eggs do. King Arthur recommends them for cookies, quick breads, muffins, brownies and bars rather than light, fluffy sponges. In keto baking, where eggs often do much of the structural work, use flax eggs to replace one or two eggs rather than all of them.
Linseed vs psyllium husk
Linseed and psyllium husk both bind, but they aren't interchangeable. Psyllium husk powder is far more absorbent: our Psyllium Husk Powder page suggests whisking it into at least ten times its weight in water to make a gel. That strong gel is what gives a psyllium loaf like our keto bread recipe its bread-like crumb. Milled linseed gives a softer, denser result and adds fat and flavour. Stick to the binder a recipe was written for, or test a small batch if you swap. For more low-carb flours and binders side by side, see our guide to keto flour.
Linseed in our mixes
Two of our baking mixes include golden linseed in their ingredients lists:
- Cookie Mix: almond flour, erythritol, chicory root fibre and golden linseed, sweetened with erythritol and stevia. You add an egg and butter, shape 14 small balls and bake.
- Scone Mix: almond flour, erythritol, coconut flour, whey protein and golden linseed, sweetened with erythritol and stevia. You add butter, an egg and Greek yoghurt.
The Cookie Mix and Scone Mix both contain almonds (tree nuts), and the Scone Mix also contains milk (whey protein). Always check the pack for full allergen information.
Free delivery is on orders over £30.
How to store linseed
Linseed is about 42% fat, and once the seed coat is broken that fat can turn rancid, giving a bitter, paint-like smell.
- Whole linseed keeps well in an airtight container in a cool, dry, dark cupboard. The seed coat protects it, and Canadian Food Focus suggests it keeps for up to a year.
- Milled linseed is best kept in an opaque, airtight container in the fridge, where it keeps for around three months, or in the freezer for longer. It stays free-flowing when frozen, so you can spoon it straight out.
- Flaxseed oil for food should go in the fridge once opened. Check the date on the bottle.
If milled linseed smells sharp or bitter rather than mild and nutty, throw it away. Grinding small amounts as you need them is the easiest way to keep it fresh.
Frequently asked questions
Is golden linseed the same as flaxseed?
Yes. Golden linseed is flaxseed with light, golden-coloured seeds, sometimes sold as golden or yellow flax. It comes from the same plant, Linum usitatissimum, as brown linseed. Golden linseed has a milder taste and blends into pale bakes, while brown is darker and earthier. You can swap one for the other weight for weight.
Is linseed oil the same as flaxseed oil?
The oil is the same, but check what you're buying. Flaxseed oil, or linseed oil labelled as a food, is cold-pressed for eating and is kept in the fridge once opened. Boiled linseed oil from DIY shops is a wood finish that usually contains metallic drying agents, so it isn't food safe and must never be used in cooking.
How many carbs are in linseed?
About 1.6g per 100g, counted the UK way with fibre excluded. USDA FoodData Central lists 28.88g of total carbohydrate per 100g of flaxseed, of which 27.3g is fibre. A level tablespoon of milled linseed, about 7g, has roughly 0.1g of carbohydrate and 1.9g of fibre. The UK's CoFID dataset has no linseed entry.
Should I use whole or milled linseed for baking?
It depends on the job. Use milled linseed when you need binding or moisture, for example in muffins, cookies, flatbreads or a flax egg, because the ground seed soaks up liquid. Use whole linseed for crunch and texture in crackers, seeded loaves and toppings. Milled linseed is what US recipes mean by flax meal.
Can I swap linseed for psyllium husk in keto bread?
Not one for one. Psyllium husk powder absorbs far more water and forms a strong gel, which gives psyllium loaves their bread-like crumb and makes the dough easy to shape. Milled linseed binds more softly and adds fat, so a straight swap usually gives a dense, crumbly loaf. Use a recipe written for linseed instead.
Sources
- US Department of Agriculture. FoodData Central: SR Legacy, "Seeds, flaxseed", FDC ID 169414 (total carbohydrate 28.88g, fibre 27.3g, fat 42.16g, protein 18.29g, 534 kcal per 100g; portion weights). Checked 25 October 2026. UK-style carbohydrate and per-portion figures are our own calculations. CoFID 2021 has no linseed entry.
- King Arthur Baking. No eggs? Here's your guide for substituting (flax egg method and best uses) and How to make homemade egg replacer (brown vs golden flax meal).
- Canadian Food Focus. Ground flax, whole flax and roasted flax (golden vs brown, forms and storage).
- Fine Woodworking. Boiled linseed oil (metallic driers and food safety).
- Groovy Keto product pages: Cookie Mix, Scone Mix and Psyllium Husk Powder: ingredients lists, allergen information, method and pack sizes.
