Nori, kelp, and dulse are three of the ocean's most useful edible seaweeds, and the quickest way to tell them apart is by family: nori and dulse are red seaweeds, while kelp is a brown seaweed. Nori is the thin, toasty sheet you know from sushi; dulse is a chewy, savory red leaf you can snack on straight away; and kelp is the broad, mineral-dense powerhouse behind umami broths. Get to know all three and you unlock a whole pantry of Mediterranean-meets-Atlantic flavor.
At KelpEat we love these three because each one earns its place at the table for a different reason. Here is how they compare on family, taste, nutrition, and everyday use — appetite first, science close behind.
What are nori, kelp, and dulse?
Seaweeds are grouped by color, and the color is more than cosmetic — it reflects genuinely different plants. According to Maine Coast Sea Vegetables, nori and dulse are both red seaweeds (Rhodophytes), while kelp belongs to the brown seaweeds (Phaeophytes).
Nori (often from the Porphyra and Pyropia genera) is the crisp, near-black sheet used to roll sushi and onigiri. Toasted, it turns green and develops a nutty aroma. Our Atlantic Nori brings that same toasty character to Mediterranean plates.
Dulse (Palmaria palmata) is a ruby-red leaf that grows on North Atlantic rocks. It is soft, a little chewy, and famously easy to eat as-is — no cooking required. Try it as 100% seaweed dulse straight from the jar.
Kelp is the giant of the group — a fast-growing brown seaweed (including species like Saccharina) that forms underwater forests. It is the most mineral-concentrated of the three and the classic building block for savory broth. Meet our 100% seaweed kelp.
How do nori, kelp, and dulse taste?
This is where the three really separate, and it is the reason to keep all of them within arm's reach.
Kelp is the umami champion. Brown seaweeds are rich in glutamic acid, the compound behind that deep, savory "moreish" sensation. The peer-reviewed journal Flavour reports that top kombu-grade kelp can carry up to about 3,200 mg of free glutamate per 100 g — which is precisely why kelp is the traditional base for Japanese dashi stock.
Nori is toasty and gently savory. The same research measured nori (Porphyra) at around 1,378 mg of free glutamate per 100 g, paired with other naturally savory compounds that amplify its flavor. Toasting brings out a nutty, almost popcorn-like note.
Dulse is the savory surprise. It has a bright, tangy edge, and Flavour notes that farmed dulse can release glutamate at levels comparable to Japanese kelp — remarkable for a seaweed you can simply nibble. Many people describe a smoky, almost bacon-like quality when dulse is pan-crisped.
Nori vs kelp vs dulse: nutrition at a glance
Seaweed portions are small, so think of these numbers as a guide to what each one brings to the plate rather than a daily quota. Composition figures are reported on a dry-weight basis and vary by species, season, and origin.
- Family & color: Nori = red seaweed; Dulse = red seaweed; Kelp = brown seaweed.
- Signature taste: Nori = toasty, nutty; Dulse = tangy, smoky-savory; Kelp = deep umami.
- Protein (dry weight): Nori reported up to ~40%; Dulse ~12–20%; Kelp lower and more variable. (Source: Maine Coast Sea Vegetables.)
- Iodine: Kelp highest by far (sugar kelp ~2,700 ppm); Dulse moderate (~140 ppm); Nori lower per portion (about 232 µg in a 10 g serving, per Harvard's Nutrition Source).
- Best used for: Nori = wraps & sprinkles; Dulse = snacking & flakes; Kelp = broth & seasoning.
One point all three share: Harvard's Nutrition Source notes that seaweed contains all nine essential amino acids, and nori in particular carries small amounts of vitamin B12. Enjoy them as flavorful additions within a varied, balanced diet.
What about iodine — how much is too much?
Seaweeds are among the richest natural food sources of iodine, and the amount differs enormously between species. Maine Coast Sea Vegetables reports sugar kelp at roughly 2,700 ppm of iodine, with dulse far lower at about 140 ppm. Harvard's Nutrition Source puts a single 10 g serving of nori at around 232 micrograms of iodine.
Because kelp is so concentrated, the sensible approach is simple: enjoy seaweed as part of a varied, balanced diet, and remember that with iodine, more is not better. A little kelp goes a long way — which is exactly why it works so well as a seasoning rather than a bulk ingredient.
Which seaweed should you cook with?
The honest answer is all three, for different jobs. Here is a quick routing guide.
Reach for nori when you want structure and a toasty finish
Roll it around rice and vegetables, tear it over a soft-boiled egg, or crumble it into a grain bowl. Nori's thin sheets crisp fast and add instant "sea" character without overpowering a dish.
Reach for dulse when you want a ready-to-eat savory hit
Dulse is the aperitivo-drawer hero: eat it straight, toss the flakes onto avocado toast or popcorn, or crisp it in a dry pan for a smoky garnish. It is the easiest of the three to fall in love with because it needs no preparation at all.
Reach for kelp when you want depth and umami
Simmer a strip of kelp gently in water to build a clean, savory broth, then lift it out before boiling. Or use kelp seasoning by the pinch to round out tomato sauces, dressings, risotto, and beans. It is the seaweed most likely to make people ask, "what makes this taste so good?"
Curious to try the trio side by side? Explore the full range of KelpEat 100% seaweed jars and snacks and taste the differences for yourself.
A quick word on how seaweed grows
Part of what makes these three so appealing is where they come from. Seaweed is cultivated in the sea itself, so it grows without freshwater irrigation, without soil, and without added fertilizers or pesticides — it draws what it needs directly from the ocean. That is a concrete, verifiable difference from most land crops, and it is a big reason we are so enthusiastic about bringing Atlantic seaweed to the Mediterranean table.
Frequently asked questions
What is the main difference between nori, kelp, and dulse?
They come from different botanical families. Nori and dulse are red seaweeds (Rhodophytes), while kelp is a brown seaweed (Phaeophyte). That difference shapes their look, taste, and best kitchen uses: nori is thin and toasty, dulse is chewy and savory, and kelp is broad, mineral-rich, and deeply umami.
Which seaweed has the most iodine?
Kelp is by far the richest. Brown kelps such as sugar kelp can hold around 2,700 ppm of iodine, while dulse sits near 140 ppm. Because kelp is so concentrated, it is best enjoyed in small amounts as part of a varied, balanced diet — with iodine, more is not better.
Which seaweed tastes the most umami?
Kelp leads on pure umami. Prized kombu-grade kelp can contain up to about 3,200 mg of free glutamate per 100 g, which is why it is the classic base for Japanese dashi broth. Nori carries roughly 1,378 mg per 100 g plus other savory compounds, and farmed dulse can rival kelp for glutamate release.
Which seaweed is highest in protein?
On a dry-weight basis, nori is the standout, with protein reported up to around 40 percent. Dulse typically ranges from about 12 to 20 percent depending on the harvest season. Seaweed servings are small, so treat these as flavorful contributors to a meal rather than a primary protein source.
How do I use nori, kelp, and dulse in cooking?
Use nori to wrap, roll, or crumble over rice, eggs, and salads. Snack on dulse straight from the jar or scatter the flakes onto avocado toast, popcorn, and soups. Simmer a strip of kelp to build a savory broth, then lift it out, or sprinkle kelp seasoning into sauces and dressings for instant depth.
KelpEat — Eat Smarter. Regenerate Your Body and the Planet. Information here is educational and not medical advice.
