Marine Phytoplankton Powder

Why we started

We started Plankton for Health the slow way: ordering marine phytoplankton from suppliers across Europe, Asia and the US, then tasting and comparing them side by side. Most were forgettable. One, Phytality, kept standing out for its purity, its taste, and the fact that one batch matched the next.

That is the powder we built the shop around, and the one I refer to throughout this guide.

What is Marine Phytoplankton Powder?

Marine phytoplankton is microscopic marine algae, among the oldest life forms on Earth. A dried serving carries protein with all nine essential amino acids, a spread of minerals, antioxidant pigments such as carotenoids and chlorophyll, and fatty acids including the omega-3 EPA. It also naturally contains the antioxidant enzyme superoxide dismutase (SOD).

What actually sets it apart is the EPA. Marine phytoplankton is one of the few plant sources of long-chain omega-3 EPA, the form most people only get from oily fish. For vegetarians and vegans, that is genuinely worth knowing. The amount per serving is modest, though, so we treat it as a useful contribution to your omega-3 rather than a fish-oil replacement.

Where Does Marine Phytoplankton Come From?

In the wild it grows throughout the world’s oceans. The supplement, by contrast, is grown inland in a closed-loop bioreactor on purified water. That means no wild harvesting, no exposure to ocean pollution, and a process that does not draw on the marine ecosystem. It is the single biggest reason a clean, food-grade powder is possible at all.

In the ocean, marine phytoplankton sits at the base of the food chain and is central to the planet’s carbon cycle. Phytoplankton are estimated to produce around half of the Earth’s oxygen and account for roughly half of all photosynthesis, despite making up only about 1% of the world’s plant biomass. (1)

Can Humans Eat Marine Phytoplankton Powder?

Yes, as long as it comes from a clean, food-grade source. The entire case for marine phytoplankton rests on how it is grown and tested, which is why this page keeps circling back to sourcing.

As a food it is genuinely nutrient-dense: protein, minerals, antioxidant pigments and omega-3 EPA, all in a small daily dose. There is more detail in our guide to its nutritional benefits. I would treat it as one considered part of a varied diet, not a patch for a poor one.

Is Marine Phytoplankton Good for you?

Independent analysis of dried marine phytoplankton puts protein at around 45% of its dry weight, covering all nine essential amino acids, alongside long-chain omega-3 fatty acids, phospholipids and carotenoid pigments.

The cells are tiny and fine-walled, which is part of why the omega-3 and phospholipids they carry are taken up readily. That said, quantities per serving are small, so the honest framing is everyday nutrition, not a megadose.

Quality varies wildly, so the source is everything. Cheaper pond-grown or open-water plankton can carry whatever was in the water it grew in. Closed-loop powder grown inland on purified water is the cleaner starting point, and that, not a fancy label, is why this kind of supplement costs what it does. You can read our customer reviews here.

Does Marine Phytoplankton Really Work?

It depends what you expect of it. Marine phytoplankton is well absorbed, and a serving delivers real nutrients, but in small amounts, so it works as a daily top-up rather than something you will feel kick in.

Stir half a teaspoon into a glass of water and you are adding a concentrated little hit of plant nutrition: protein, minerals, antioxidant pigments and omega-3 EPA. But this is a food, not a stimulant, and not a stand-in for a balanced diet. It rewards the people who treat it as one small, steady habit, not the ones chasing a quick fix.

What’s the Recommended Dosage of Marine Phytoplankton?

A typical daily dose is around half a teaspoon of powder, or the same again in capsules. We cover timing and how to fit it into your routine in our dosage guide.

What is the Marine Phytoplankton Supplement Brand?

We compared the marine phytoplankton supplements we could get hold of across the UK, EU and US markets. Phytality is the one we kept coming back to, and the one we now stock in our shop. We could have stocked cheaper powders at a better margin, but this is the one we were happy to put our name to.

It is not cheap, dearer than many, and I would rather explain why than pretend it is a bargain. Clean, closed-loop production costs more than open-water or pond growing, and that difference lands in the price.

Phytality is our current top pick: a multi-strain marine phytoplankton raised in a closed-loop, inland bioreactor on purified water. The multi-strain part is what won us over, since it gives a broader nutrient profile than the single-strain powders we lined it up against.

The questions worth asking of any phytoplankton are the boring ones: where is it grown, what is the water, and is each batch checked for heavy metals and microbial contamination? It is always worth asking a supplier for a certificate of analysis, and we set out what we look for in our testing and sourcing policy.

For reference, you can see the kind of analysis marine phytoplankton biomass is put through in this published certificate of analysis, covering heavy metals and microbiology.

Is Marine Phytoplankton Vegan?

It is 100% vegan, and one of the few plant sources of phospholipid-bound EPA. A good share of its omega-3 is carried as polar lipids, the phospholipid form that the body takes up readily. In short, it is a plant route to the long-chain omega-3 more usually found in oily fish, in a form the body can use.

Marine Phytoplankton for Dogs

Dog owners are some of our keenest customers. If you want the detail, we have pulled it together in our guide to phytoplankton for dogs.

A fair chunk of our sales go to pet owners who stir a little into their dog’s food as a nutritional top-up, and the emails we get back are lovely. The line we give them is the same one we give everyone: it is a food, not a treatment. If your dog is unwell, your vet is the person to see, not us.

Does Marine Phytoplankton Have EPA or DHA?

Marine phytoplankton carries its Omega-3 EPA in the phospholipid form, the shape the body absorbs more readily, and the better strains are picked for being naturally high in it (ref). That is unusual for a plant source.

Phospholipids are the more bio-available form of Omega 3 oil, the same selling point you see hyped on krill oil.

Because it is grown in a controlled bioreactor rather than scooped from the open sea, it brings EPA omega-3 along with a broad spread of natural minerals. If you are giving fish a miss, that is really the point of it: a plant route to long-chain EPA in a form your body can actually use.

If concentrated EPA is your only goal, fish oil carries more of it per dose, and we will not pretend otherwise. Our preference for a plant source is partly about sidestepping the heavy-metal and sustainability worries that trail fish oil, and partly because phytoplankton is a whole food rather than a single isolated nutrient.

DHA, the other long-chain omega-3, shows up only in trace amounts: roughly 0.05 to 1.5mg per gram. That is genuinely low, so we do not sell this as a DHA source. If DHA is your priority, an algal DHA oil is built for the job and the better-targeted choice.

Iodine Content

One useful distinction: iodine is concentrated in macroalgae (seaweed), not in marine microalgae like phytoplankton. No iodine is added to the growing medium, which is filtered, purified water, so iodine in the finished powder is negligible. That matters if you are watching your iodine intake, for example in pregnancy or with a thyroid condition, where seaweed-based products can deliver far more than expected.

Sources we used

(1) Oxygen Production: National Geographic
(2) Smaller than a Blood Cell: Scientific American