Where to Buy Wolffia Globosa (Water Lentils)

Wolffia globosa, commonly called water lentils or watermeal, is available through a handful of channels depending on where you live and what form you want. In Southeast Asia, fresh wolffia has been sold in local markets for generations. Outside that region, the most accessible route is ordering online from specialty food companies, supplement retailers, or aquatic plant vendors. The catch is that availability is still limited compared to mainstream superfoods, and regulatory status varies by country, which shapes what you can actually get your hands on.

Fresh Wolffia in Southeast Asian Markets

If you happen to be in Thailand, Laos, or Myanmar, buying wolffia globosa is as straightforward as visiting a local market. In Thailand, the plant goes by names like khai nam, kai-pum, or kai nhae, which translate roughly to “water eggs,” and it has been eaten as a protein source for many generations across the region.¹ It is sold fresh and rootless, often floating in water in plastic bags or small containers. Thai cooks use it in omelets, soups, and stir-fries, treating it similarly to how you might use fresh herbs or microgreens. The plant itself is tiny, roughly the size of a pinhead, and each individual frond has a simple oval shape with no roots, stems, or leaves in the conventional sense.²

For travelers or expats in the region, fresh wolffia is cheap and widely available. Outside of Southeast Asia, finding it fresh is essentially impossible unless you grow it yourself. The plant spoils quickly once harvested, and international shipping of a perishable aquatic plant in small consumer quantities is not commercially viable.

Mankai, the Main Commercial Brand

The most recognizable wolffia globosa product on the global market is Mankai, a proprietary non-GMO strain developed by the Israeli company Hinoman. Mankai is cultivated in controlled, closed freshwater environments rather than open ponds, which addresses many of the contamination concerns that come with wild or outdoor-grown duckweed. Hinoman sells Mankai primarily as frozen cubes and as a ready-to-blend frozen shake, marketed toward health-conscious consumers and people looking for plant-based protein alternatives. The product is available through Hinoman’s own website and through select online grocery and health food retailers, though distribution has expanded and contracted over time depending on the region.

What sets Mankai apart from generic wolffia powder is the body of clinical research behind it. A randomized trial found that the protein from Mankai raised blood levels of essential amino acids comparably to soft cheese and green peas, with the exception of branched-chain amino acids, where cheese performed somewhat better.³ Mankai also contains bioactive vitamin B12, with levels averaging about 2.8 micrograms per 100 grams of dry weight, and that concentration stays stable across seasons.⁴ A plant source of bioavailable B12 is genuinely unusual, which is part of why the product has attracted attention in vegan and plant-based communities.

If you want to try wolffia globosa for the first time, Mankai frozen products are the easiest entry point for consumers in North America and Israel. Availability in Europe is more complicated because of regulatory hurdles discussed below.

Dried Powder and Supplement Forms

Wolffia globosa powder is sold by a smaller number of specialty supplement and superfood companies, mostly through online marketplaces. You will find it listed as “watermeal powder,” “duckweed powder,” or occasionally “water lentil powder.” Some of these products are marketed as protein supplements, highlighting the plant’s high protein content, which can reach roughly 30 to 40 percent of dry weight depending on growing conditions.⁵ Others are sold as green superfood blends where wolffia is one ingredient among several.

The drying method used to make the powder matters more than most buyers realize. Freeze-dried wolffia retains significantly more protein, vitamin C, and total phenolic compounds than oven-dried or sun-dried versions.⁶ Meanwhile, high-pressure processing, a non-thermal technique, preserves cell structure and improves both protein digestibility and the availability of minerals by reducing compounds like phytic and oxalic acid that normally block mineral absorption.⁷ If a product label mentions freeze-drying or cold-processing, that is generally a better sign than if it simply says “dried” without specifying the method.

One practical tip: check the species name on the label. The duckweed family includes several genera and dozens of species. Wolffia globosa is the one with the most research supporting it as a food, but cheaper products sometimes contain Lemna minor or other duckweed species, which are nutritionally different and have their own separate regulatory profiles. A reputable seller will state the species clearly.

Regulatory Landscape and Why It Limits Your Options

Where you live has a major impact on what wolffia products you can buy. In the European Union, wolffia globosa powder was evaluated as a novel food by the European Food Safety Authority. The panel concluded that an increase in manganese intake from the product was a safety concern and that the safety of the novel food could not be established under the conditions proposed.⁸ This does not mean the plant is inherently dangerous, but it does mean that selling wolffia globosa powder as a food ingredient in the EU remains restricted. A separate evaluation approved a protein concentrate from related Lemna species, but wolffia globosa specifically has not cleared the bar yet.

In the United States, the regulatory picture is less rigid. Duckweed products, including wolffia, have been sold as dietary supplements and in some cases as food ingredients without specific FDA novel food authorization. Israel, where Hinoman is based, permits Mankai products for food use. Regulatory assessments in various jurisdictions generally support the use of wolffia as a food ingredient under defined conditions, though no jurisdiction has approved specific health claims for the plant.⁹

The practical upshot is that European consumers face the most limited selection. If you are in the EU and see wolffia globosa powder for sale from a non-EU seller, be aware that importing it for personal use may be legal in small quantities, but the product itself has not been cleared for commercial sale as food within the EU.

Safety Concerns When Choosing a Source

Wolffia globosa is one of nature’s most efficient absorbers of heavy metals. That is great news if you are using it for water purification, but it is a real concern if you plan to eat it. The plant readily accumulates cadmium and chromium from its growing water, with concentrations in the fronds increasing as exposure time and metal levels rise.¹⁰ Even at low cadmium concentrations in the water, the plant can accumulate the metal to levels far exceeding what was in the surrounding solution.¹¹

This means the growing environment is everything. Wolffia harvested from open ponds, rivers, or rice paddies can carry pesticides, heavy metals, foodborne pathogens, and dioxins, all contaminants commonly associated with outdoor-grown duckweed.¹² Companies growing wolffia in closed, controlled-environment systems with clean water inputs largely sidestep these issues, which is one reason products like Mankai from controlled cultivation carry a premium price.

When evaluating a wolffia product, ask or look for information about how and where the plant was grown. Was it cultivated in a controlled indoor or greenhouse system, or harvested from outdoor ponds? Does the company test for heavy metals and microbial contamination? These are not hypothetical concerns. The EFSA evaluation that flagged manganese as a safety issue was responding to the mineral content of the plant itself under real growing conditions, not an unusual scenario.

Live Cultures for Growing Your Own

If commercial wolffia products are hard to find in your area, or if you want a steady supply without ongoing costs, buying a live starter culture and growing the plant yourself is a realistic option. Aquatic plant vendors, particularly those catering to aquarium hobbyists, sell live wolffia globosa cultures online. A small portion of live plants is enough to start a colony, since wolffia reproduces rapidly through budding. Each mother frond produces daughter fronds from a reproductive pocket at one end, and under good conditions the population can double in a few days.²

The plant grows best in still or very gently moving water at temperatures between roughly 20 and 31 degrees Celsius, with moderate light. Wolffia is rootless and floats on the water surface, so it needs no substrate, and a shallow container or tray works fine. You will need to provide nutrients in the water, typically through a dilute hydroponic solution. Under aerated conditions with sufficient nitrogen and light, biomass productivity can be dramatically higher than in static water.¹³

The biggest caveat with home growing for food is water quality. If you are using tap water, you need to know what is in it. Municipal water with traces of heavy metals will produce wolffia that has concentrated those metals. Filtered or distilled water with a clean nutrient solution is much safer. You also need to prevent contamination from insects, bird droppings, and airborne pollutants if growing outdoors. An indoor setup with artificial lighting gives you the most control, though it requires more effort to maintain.

The Nutritional Appeal Driving Demand

People seek out wolffia globosa for a few specific reasons, and understanding those reasons helps you decide whether the effort of tracking it down is worthwhile for you. The protein story is the biggest draw. Wolffia is unusually protein-dense for a plant, and the protein quality is high enough that your body absorbs its essential amino acids at rates comparable to dairy and legume proteins.³

The B12 content is arguably even more distinctive. Most plant foods contain no bioavailable B12 at all, making supplementation necessary for strict vegans. Wolffia globosa contains B12 that humans can absorb, which makes it a rare plant-based source of a nutrient that vegans typically must get from fortified foods or pills.⁴ Whether the quantities you would realistically eat provide enough B12 to replace supplementation is a separate question. The amounts in the studies are based on dry weight, and you would need to calculate how much fresh or reconstituted wolffia you would actually consume daily.

There is also emerging evidence around blood sugar. In people with type 2 diabetes, consuming Mankai before dinner lowered the post-meal glucose peak by about 19 percent and delayed the time to that peak by roughly 20 percent compared to water alone.¹⁴ An earlier trial in a general population found that a wolffia-based shake produced a lower and later glucose spike than a yogurt shake, and even led to slightly lower fasting glucose the following morning.¹⁵ These are small crossover trials, not the kind of evidence that warrants treating wolffia as a treatment for diabetes. But they do suggest the plant has some functional food properties beyond basic nutrition.

How People Actually Cook and Use It

Fresh wolffia has a mild, slightly vegetal taste that does not overpower a dish. In Thai cuisine, it is most often scrambled into eggs or stirred into soups near the end of cooking. The texture is almost imperceptible individually because each frond is so small, but in quantity it adds a soft, slightly creamy mouthfeel.

In its dried or powdered form, wolffia behaves differently. Recent food science research has explored using wolffia protein extract as an umami enhancer in plant-based soups. At low concentrations, around half a percent, the extract did not alter the flavor profile in ways that consumers found objectionable. At higher concentrations, above about 1.5 to 2 percent, the darker color and green flavor notes made the product less appealing to taste panelists.¹⁶ The takeaway for home cooks is that a little goes a long way. Wolffia powder blends well into smoothies, can be stirred into soups or sauces, and works in green energy balls or baked goods where the color is not a concern. Dumping large quantities into a recipe will make it taste grassy and look unappetizingly dark.

If you buy the frozen Mankai cubes, the intended use is blending them into shakes and smoothies. This is how the product was consumed in most of the clinical trials. You can also thaw the cubes and fold them into other dishes, but the green color means it works best in foods where green is already the expected palette.

A Plant Biologists Are Watching Closely

Wolffia species sit in an interesting spot for researchers. The genus includes the world’s smallest flowering plants, and their genomes are unusually streamlined. Wolffia australiana, a close relative, shows extensive gene loss and gene expansion compared to other plant species, with notably rewired pathways for pathogen defense and hormone signaling.¹⁷ The extreme simplification of the wolffia body plan, no roots, no stems, no obvious leaves, is coupled with a transcriptome that represents a kind of minimal set of plant genes. Researchers have proposed using wolffia as a biological chassis for synthetic plant biology, essentially a starting platform onto which new functions could be engineered.¹⁸

None of that is directly relevant to someone trying to buy wolffia to eat today. But it does explain why the plant is attracting investment and scientific attention out of proportion to its current market size. As more research labs and startups work with wolffia, the pipeline of commercially available products is likely to grow. Several companies beyond Hinoman are exploring duckweed cultivation for food, feed, and even wastewater treatment, and improvements in controlled-environment growing systems are making it cheaper to produce at scale. Whether wolffia globosa becomes a common grocery-store item or remains a niche product depends heavily on whether regulators in major markets clear the remaining safety questions, particularly around mineral content and standardized growing conditions. For now, your best bet is Mankai products for a proven, tested option, reputable supplement vendors for dried powder, or a live culture and a clean tray of water if you like the idea of growing your own food on a windowsill.