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What we know · Question 7

# Where does algae protein come from, and what can you actually buy?

Short answer: from two different things. One is a microalga grown on purpose in a pond or a tank, and the other is a seaweed taken from the sea or from a marine farm. What you can actually buy is mostly a supplement or a sea vegetable, and the word protein is doing less work than it sounds: the clearest consumer product that names a seaweed protein is a bacon sold in the United States.

This entry takes one question about future food and answers it from dated sources. Sentences marked as claims carry their source, the date we checked it and the date the source was checked. Everything else on the page is our own writing, and it is not a claim.

Entry checked 19 September 2026 · 36 sentences, each with its source · no person approved these sentences · [What this does not show](#limits)

Filed under [alternative-protein](/what-we-know/#tag-alternative-protein) · [regulation](/what-we-know/#tag-regulation) · [labelling](/what-we-know/#tag-labelling)

## Where the protein comes from

Two different things travel under the word algae, and they reach a plate by different routes. One is a microalga grown on purpose. The other is a seaweed, and most of the seaweed people eat is still taken from the sea rather than farmed for a protein aisle.

Where Europe authorises an astaxanthin made by an alga, the regulator describes growing it in closed systems or open ponds. [[1]](#source-1)

A Canadian retailer's own listing describes chlorella as a cultivated single-celled freshwater green alga. [[2]](#source-2)

One Hawaiian producer says every product it sells is grown on its own farm. [[3]](#source-3)

So the first half of the answer is a tank, a pond or a farm. The second half is older and less technological.

A small Canadian family business sells wild edible seaweed that it harvests itself in British Columbia. [[4]](#source-4)

A United States harvester labels its dulse a wild-harvested Atlantic sea vegetable. [[5]](#source-5)

Not everything grown from an alga becomes food. One of the clearest examples of that is a Canadian company farming kelp for farmers.

A Canadian company cultivates kelp and turns it into liquid solutions for farmers rather than food for shoppers. [[6]](#source-6)

The other large producers in this category sell to companies rather than to people, which is why their names rarely appear on a packet.

A Canadian seaweed processor says its seaweed is for plants, animals and people. [[7]](#source-7)

A Galician company calls its seaweeds the vegetables of the sea. [[8]](#source-8)

In Spain and Galicia the story is a food business rather than a technology one, and it describes both ways of getting the seaweed out of the water.

A Spanish business says it specialises in harvesting, drying and preparing seaweed for food. [[9]](#source-9)

A Galician processor says its seaweed comes from both cultivation and harvest on its own coast. [[8]](#source-8)

That is the whole route: an organism, a way of growing it or gathering it, and then either a purification step for an ingredient or a drying step for a vegetable. The word protein only becomes interesting at the third step, and that is where most of the announcements stop.

## Where it is allowed

Canada keeps a list of the novel foods it has assessed, and the algae rows on it are worth reading one at a time, because they are not all the same kind of thing.

Canada's list of completed novel-food assessments carries a whole algal protein made from Chlorella protothecoides. [[10]](#source-10)

The same list carries a whole algal flour assessed as a partial replacement for cream, milk, eggs and butter. [[10]](#source-10)

A freeze-dried marine microalga is on that list as well. [[10]](#source-10)

Europe's list works the same way, and for the same microalga it adds something Canada's table does not show: a condition that has to be printed.

In Europe the same microalga is authorised under the name dried microalgae. [[1]](#source-1)

Europe requires supplements made with that microalga to state that it contains negligible amounts of iodine. [[1]](#source-1)

The European list also carries the seaweed extracts that sit behind a lot of ordinary food, and one row that says plainly that regulators treat seaweed as a food with a contaminant profile of its own.

Europe also authorises a fucoidan extract from two seaweeds. [[1]](#source-1) [[1]](#source-1)

An astaxanthin-rich oleoresin from Haematococcus pluvialis is authorised there too. [[1]](#source-1)

Europe's contaminant rules give food supplements that are at least 80 % dried seaweed a row of their own. [[11]](#source-11)

Two other regulator records belong here and could not be read in this entry: the United States inventory of GRAS notices, which is published as a spreadsheet download rather than a page, and Singapore's list of approved novel foods, which answered as a PDF with no text we could quote. Both are recorded, neither is cited, and no sentence above rests on them.

## What you can actually buy

This is where the answer narrows, and it narrows fastest in Canada.

A Canadian online retailer lists spirulina, chlorella, kelp, sea moss and seaweed blends as powders, capsules, tablets and liquids. [[12]](#source-12)

That retailer files them under wellness routines rather than under food. [[12]](#source-12)

A second Canadian retailer stocks spirulina, chlorella and sea vegetables, including a United States harvester's seaweed brand. [[2]](#source-2) [[2]](#source-2)

The other Canadian route is not a supplement shelf at all. It is the same wild seaweed your grandmother might have bought, sold by the pound.

A Canadian family business sells dulse, nori, kombu kelp, sugar kelp and Irish moss straight to shoppers. [[13]](#source-13) [[13]](#source-13)

In the United States there is one product that puts the word protein on the front of the pack, and the maker says where it comes from.

One United States maker says its plant-based bacon is made with protein from red seaweed. [[14]](#source-14)

The rest of the American route looks like the Canadian one, with the same supplement framing and the same microalgae.

A long-established chlorella business sells its chlorella as a nutritional supplement. [[15]](#source-15)

In the United Kingdom and in Spain the purchase is a food purchase, and in Spain it is a deliberately narrow one.

A Cornish company sells seaweed to eat, and it says the seaweed is harvested by hand. [[16]](#source-16) [[16]](#source-16)

The Spanish seaweed business says it sells only through specialist organic shops. [[9]](#source-9)

The most instructive fact in this section is not a product. It is a company that no longer exists.

The best-known seaweed-protein brand stopped trading after seven years. [[17]](#source-17)

Before it stopped, the same company said its burgers had reached more than 1,000 shops. [[17]](#source-17)

We also tried to check the bacon maker's own distribution page. It answered 404 on the day we looked, so the maker's retail list is not published here as a route. A page that has moved is not evidence that a product has gone, and it is not evidence that it is still there either. Nothing in this entry was bought as a test.

## What sits beside it

Seaweed is food, and one seaweed carries a warning that two regulators publish in plain words. Both warnings are about the same species, and both belong in an entry that tells you where to buy seaweed.

Canada's food safety agency advises consumers to avoid hijiki seaweed. [[18]](#source-18)

Its tests found inorganic arsenic in hijiki at levels significantly higher than in other kinds of seaweed. [[18]](#source-18)

For dulse, nori and kombu, the same agency reports low sample results. [[18]](#source-18)

Most hijiki is sold to restaurants and wholesalers rather than to shoppers. [[18]](#source-18)

Singapore's food agency explains the mechanism and gives people something to do about it.

Singapore's food agency says hijiki absorbs and accumulates high levels of inorganic arsenic from seawater. [[19]](#source-19)

The same agency tells people to soak hijiki in warm water for about 20 minutes. [[19]](#source-19)

It adds that the soaking water should not be drunk and should be thrown away. [[19]](#source-19)

The supplement route has its own record, and it belongs on this page rather than in a footnote, because it is the route most readers can actually use.

A 2026 recall covered a green powder made with chlorella and spirulina because of Salmonella Typhimurium. [[20]](#source-20) [[20]](#source-20)

None of this says seaweed or algae is dangerous. Hijiki is one species, and the agency that warns about it also reports low sample results for dulse, nori and kombu. But a category that is sold on its purity should be read with its recall record open, and the recalls above are the ones a shopper would never see on a packet.

## What this does not show

This is the block we require on every entry that could be read as saying something about an outcome. Elements 1 to 7 apply to every entry; 8 to 12 apply where the entry makes a claim about an outcome, and this one does not, so they are answered explicitly rather than left out.

1. Dates

The research this entry draws on was compiled on 18 September 2026, and every source here was re-retrieved on 19 September 2026. Each factual sentence carries the date we checked the copy behind it. Health Canada's page and the company pages are not dated; their contents are tables, product listings and store pages read on that date. The Canadian Food Inspection Agency's page is dated 9 December 2019, and the Union list is the text published in 2017. Later amendments to that list were not read.

2. What kind of evidence this is

Five regulator pages or documents, one live enforcement database, and fourteen pages published by companies, retailers and one trade publication. The company and retailer pages are those organisations describing themselves and their own products. One claim rests on a trade report and says so in the sentence itself. No trial, no study and no life-cycle assessment is behind any sentence here.

3. Who was studied

Nobody. These sources describe authorisations, product listings, contaminant limits, recall records and a business closure. They do not describe a study population, an age range or a follow-up period, because they are not studies. Nothing here is evidence about what happens to a person who eats algae or seaweed.

4. The comparator

There is none. This entry does not compare algae protein with meat, with soy or with anything else, and the environmental sentences that would have invited that comparison did not survive that check.

5. Adjustments

Not applicable: no statistical model is reported in the sources used here.

6. Uncertainty as reported

Every product listing is one observation on one day, and no stock or price was checked over time. The research run recorded 32 offerings across 30 companies, and this entry publishes a much smaller set of sentences because a listing can support what it says and very little else. Three sources could not be retrieved at all, and we left out every sentence that depended on them.

7. What no source here can say about a product

No source measures any food in our directory, its ingredients as sold, its price near you, or what it does for a person. A regulator's row about an ingredient is not a statement about a packet, and a maker's description of its own protein is not an independent test of it.

8. Counter-signals

This entry makes no claim about diet and health, so it has no counter-signals of that kind, and the sentences about health written for it are not here because their sources did not carry them. The findings that work against a flattering reading carry their sources anyway: most of the protein in this category is sold as a supplement rather than as food, a Canadian company grows kelp and sells it to farmers, the best-known seaweed-protein brand has closed, and hijiki carries a warning from two regulators.

9. Adequacy caveats

Not applicable. This entry makes no claim about nutritional adequacy for anyone, at any age, and it refuses to say whether any algae is a complete protein. That is a deliberate gap rather than an oversight: no source retrieved for this entry carries an amino-acid profile.

10. What we did not check

No person reviewed or approved these sentences before publication. We did not buy anything, so no purchase was tested. We did not read Singapore's approved-foods list or the United States GRAS inventory, because neither could be retrieved as text. We did not read the European Union's later amendments to the Union list, the iodine content of any named seaweed product, or any market outside Canada, the United States, the United Kingdom, France, Spain and Singapore. The research run also found three retailer and brand domains serving unrelated content, and those are recorded as anomalies rather than as closures.

11. What would change it

One retrievable regulator page in the United States or Singapore, one Canadian shop listing an algal food rather than a supplement, one maker publishing a distribution page that answers, or someone reviewing these sentences. Any of those would move a sentence in this entry.

12. What is not on this page

Some sentences written for this entry are not here. They are left out when their source could not be retrieved, when the source did not carry the point the sentence made, when the source contradicted it, or when the wording was too hedged to state plainly. Nothing here rests on a source we could not retrieve. Other sentences were left out for length, and the entry's own record names each one and the reason. The full list of what was written and left out is in this entry's record, not on this page.

This page is general information about published sources. It is not medical advice, and it is not a substitute for advice from a qualified health professional. No clinician has reviewed it, and we do not know anything about your diet, your medication or your health. If a health question brought you here, take it to a professional who knows you.

## Our position

Written by Find My Next Bite · 19 September 2026

Algae is the oldest food in this section and the newest protein pitch, and those two facts are usually told as one story. We think they should be kept apart. Seaweed has been dinner for centuries, and the microalgae a shopper meets today are mostly sold in the supplement aisle. The interesting question is not whether algae is food. It is what has to happen before one alga becomes a protein a person can buy, and the answer is a tank, a purifier and a regulator.

That is why this entry keeps the supplement shelf visible instead of treating it as a lesser version of the food. A Canadian shopper can buy spirulina and chlorella today, and cannot buy a cultivated-microalga food at all. Telling that honestly is more useful than a growth chart, and it is also the shape of the whole category: the ingredients move faster than the products, and the products move faster than the brands selling them.

We are also not going to hand you an environmental story we could not check. The sentence about kelp absorbing carbon and preventing ocean acidification did not survive that check, and the sentence about seaweed farming restoring the ocean did not either, because a seller's own line is a sales claim and not a measurement. They stay in the record as sentences we could not stand behind. What we can say is what two regulators say about one seaweed that carries a real warning, and that belongs on the same page as the purchase link.

Every change this site makes to a sentence it has published is recorded, dated, at [Corrections and revisions](/what-we-know/corrections/) — what it said before, what it says now, and which kind of change it is. Nothing here is rewritten quietly.

## Where to go next

If you came here to understand, the directory is where the useful part starts: the same dated discipline, pointed at things a person can put on a plate. Ordinary links on this site earn us no commission, and no product, maker or merchant paid for a mention in this entry.

[Browse the directory →](/foods/)

[Read what we know about other foods →](/what-we-know/)

The directory does not carry an algae or seaweed category yet, so this entry sends you to the whole list rather than to an empty shelf. Nothing in this entry is for sale, and no promotion or paid placement appears inside it.

## Sources

Every numbered sentence above was checked against the source with that number on the date shown. The number links to the entry in this list.

Commission Implementing Regulation (EU) 2017/2470: Union list of authorised novel foods. European Union, Official Journal L 351. regulator. [Open the source ↗](https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=OJ:L:2017:351:FULL) Checked 19 September 2026. Backs 5 sentences in this entry.

Spirulina & chlorella. Goodness Me!. merchant. [Open the source ↗](https://www.goodnessme.ca/collections/spirulina-chlorella) Checked 19 September 2026. Backs 2 sentences in this entry.

Nutrex Hawaii. Nutrex Hawaii. company. [Open the source ↗](https://nutrex-hawaii.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

BC Kelp. BC Kelp. company. [Open the source ↗](https://www.bckelp.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

Maine Coast Sea Vegetables. Maine Coast Sea Vegetables. company. [Open the source ↗](https://seaveg.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

Cascadia Seaweed. Cascadia Seaweed. company. [Open the source ↗](https://cascadiaseaweed.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

Acadian Seaplants. Acadian Seaplants. company. [Open the source ↗](https://www.acadianseaplants.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

Porto-Muiños. Porto-Muiños. company. [Open the source ↗](https://portomuinos.com/) Checked 19 September 2026. Backs 2 sentences in this entry.

Algamar. Algamar. company. [Open the source ↗](https://www.algamar.com/) Checked 19 September 2026. Backs 2 sentences in this entry.

Completed safety assessments of novel foods including genetically modified (GM) foods. Health Canada. regulator. [Open the source ↗](https://www.canada.ca/en/health-canada/services/food-nutrition/genetically-modified-foods-other-novel-foods/approved-products.html) Checked 19 September 2026. Backs 3 sentences in this entry.

Consolidated text: Commission Regulation (EU) 2023/915 on maximum levels for certain contaminants in food. European Union. regulator. [Open the source ↗](https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:02023R0915-20250101) Checked 19 September 2026. Backs 1 sentence in this entry.

Spirulina & sea vegetables. Well.ca. merchant. [Open the source ↗](https://www.well.ca/categories/spirulina-sea-vegetables_1821.html) Checked 19 September 2026. Backs 2 sentences in this entry.

Dark Harbour Dulse. Dark Harbour Dulse. company. [Open the source ↗](https://www.darkharbourdulse.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

Umaro Foods. Umaro Foods. company. [Open the source ↗](https://umarofoods.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

Sun Chlorella. Sun Chlorella. company. [Open the source ↗](https://www.sunchlorella.com/) Checked 19 September 2026. Backs 1 sentence in this entry.

The Cornish Seaweed Company. The Cornish Seaweed Company. company. [Open the source ↗](https://cornishseaweed.co.uk/) Checked 19 September 2026. Backs 1 sentence in this entry.

Akua, the kelp burger startup, ceases operations. Green Queen. publication. [Open the source ↗](https://www.greenqueen.com.hk/akua-kelp-burger-plant-based-meat-startup-ceases-operations/) Checked 19 September 2026. Backs 2 sentences in this entry.

Inorganic arsenic in hijiki seaweed. Canadian Food Inspection Agency. regulator. [Open the source ↗](https://inspection.canada.ca/en/food-safety-consumers/fact-sheets/specific-products-and-risks/chemical-hazards/inorganic-arsenic) Checked 19 September 2026. Backs 4 sentences in this entry.

Inorganic arsenic in hijiki seaweed. Singapore Food Agency. regulator. [Open the source ↗](https://www.sfa.gov.sg/food-safety-tips/food-risk-concerns/risk-at-a-glance/inorganic-arsenic-in-hijiki-seaweed) Checked 19 September 2026. Backs 3 sentences in this entry.

openFDA food enforcement (recall) reports for spirulina. United States Food and Drug Administration. regulator. [Open the source ↗](https://api.fda.gov/food/enforcement.json?search=product_description:%22spirulina%22&limit=10) Checked 19 September 2026. Backs 1 sentence in this entry.

How this was written

## Method and care

Every factual sentence here was checked against a retrieved copy of the source it names: one sentence, one retrieved source, one verbatim quote, one checked date. No person reviewed or approved these sentences before publication.

Reviewed by: — no named reviewer has reviewed this entry, and no clinician has. It is a compilation of published sources by this site.

Written by: Find My Next Bite's writing agent, 19 September 2026, working from this project's own algae research of 18 September 2026. No person reviewed or approved these sentences before publication.

Funding: this section is unfunded. It takes no sponsorship, and the rule we adopted in advance says no funder may ever be a company whose products the entries or the directory describe.

Corrections: if a source here has changed, moved or been retracted, tell us and we will suspend the sentence and record the change.

Sources used: Health Canada's completed novel-food assessment table, the European Union's Union list and its contaminant regulation, the Canadian Food Inspection Agency, the Singapore Food Agency, the openFDA enforcement database, and fourteen company, retailer and trade pages.

Request a correction ↗

[Read our approach](/#how-it-works)

[Explore the food →](/foods/)