People ask this question after finding a research paper where both names appear interchangeably. Or they've seen Mankai in a product or study, and they're trying to figure out whether it's the same ancient plant communities in Thailand have been eating for generations.
Short answer?
They're the same species. But the full answer matters more — especially if you care about nutrition, bioavailability, and whether the plant you're putting in your body has been tested in real human clinical research.
Note: If you're looking for a simple, real-food source of plant nutrition that doesn't require meal prep — join the Wolfa waitlist at mywolfa.com and be first to know when it launches.
Wolffia Globosa: The Species
Wolffia globosa is the scientific name for the world's smallest flowering plant.
It's a real, rootless, vein-free aquatic plant — a single flat oval structure between 0.4 and 0.9mm long — that floats on the surface of ponds and lakes across Southeast Asia. It belongs to the duckweed family (Lemnaceae), one of the most studied groups of aquatic vegetables used as human food sources across history. Duckweed species have been a source of nutrients and a source of protein in traditional diets across Asia for centuries.
In Thailand, locals call Wolffia globosa "khai nam," which roughly translates to "eggs of the water." It's a traditional vegetable in Isan cuisine — tossed into soups, salads, and curries much the way Westerners might use leafy greens or herbs.
Wolffia globosa is the species name. The taxonomy.
But here's where it gets more interesting.
So What Is Mankai, Exactly?
Mankai is a cultivated strain of Wolffia globosa.
All Mankai is Wolffia globosa. But not all Wolffia globosa is Mankai.
Mankai was developed as a proprietary, selectively cultivated variety of the duckweed plant, specifically bred and farmed to optimize nutritional consistency. The wild plant varies in composition depending on the water it grows in, the temperature, and seasonal conditions — Mankai, by contrast, is grown in closely monitored aquatic greenhouses under precision agriculture controls.
Same species. Different standards entirely.
That distinction matters a lot more than it might seem at first.
Nutritional Value: Wild vs. Cultivated
This is where the comparison gets genuinely useful for anyone considering this as a regular food source or supplement.
The wild plant is nutritious — no question. It contains protein, fiber, vitamins, and various nutrients that have made it a valued vegetable in Southeast Asian foods for centuries. But the nutritional profile of wild duckweed shifts depending on how and where it's grown. You're not getting a consistent product from a natural pond.
Mankai, grown under controlled conditions, consistently delivers:
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Protein: More than 45% of Mankai's dry weight is protein, containing all nine essential amino acids. That makes it a complete protein source with an amino acid profile that researchers have compared favorably to egg protein. For most whole foods in the plant kingdom, that combination is genuinely rare.
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Vitamin B12: This is the one that surprises people. Mankai contains authentic, bioactive forms of vitamin B12 — confirmed through LC-MS/MS analysis across multiple seasons and growing conditions. Not pseudo-B12 (the inactive form found in spirulina), but real cobalamin.
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Iron: One cup of Mankai shake provides approximately 75% of the recommended daily iron intake in bioavailable form.
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Folate: About 60% of recommended daily folic acid per serving of Mankai.
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Calcium, fiber, and polyphenols: Mankai is also a source of calcium, dietary fiber, and over 200 identified polyphenolic compounds.
The wild plant shares some of these nutrients. But the consistency and bioavailability that Mankai provides through controlled cultivation is what makes it practical as a functional ingredient rather than just a regional vegetable.
The Vitamin B12 Story
Vitamin B12 in a plant sounds too good to be true. But this is actually one of the most researched aspects of Mankai, and the evidence holds up.
Most plant-based foods don't contain vitamin B12 in a usable form. Spirulina, for example, contains pseudo-B12, a form that research suggests may actually compete with real cobalamin absorption in the body. Not what you want from a supplement.
Mankai is different. Multiple analyses confirmed that Mankai contains real cobalamin congeners — methylcobalamin, adenosylcobalamin, hydroxocobalamin, and cyanocobalamin — at stable levels across all four growing seasons in greenhouse cultivation.
In the DIRECT-PLUS trial (NCT03020186), 294 participants following a Green Mediterranean diet including a daily Mankai green shake saw serum vitamin B12 levels increase by 15.4% over 18 months — while simultaneously cutting red meat significantly. That's Mankai functioning as a plant-based vitamin B12 source in a real, published randomized controlled trial.
The Gut Microbiota Research
One underreported angle of Mankai research is what happens in vitro — in laboratory models of the human gut.
Researchers tested how Mankai interacts with gut microbiota using in vitro colon fermentation models. The results: Mankai significantly stimulated the production of short-chain fatty acids (SCFAs) and phenolic metabolites — both of which are important for metabolic health and inflammation regulation in humans. Three phenolic catabolites in particular increased significantly after 24 hours of fermentation.
This in vitro research gives researchers a window into the gut-level mechanisms that may underpin some of Mankai's broader health effects observed in humans.
Is Wolffia Globosa Safe to Eat?
Yes — it's been eaten safely by humans in Southeast Asia for centuries.
From a regulatory standpoint, Mankai has been assessed by the European Food Safety Authority (EFSA). Their review found no toxicological concerns at normal dietary levels. Pesticides, mycotoxins, and cyanotoxins were below quantification limits in tested samples. Multiple rat toxicity studies at various dose levels showed no adverse effects.
One important nuance: wild plants from this duckweed species, grown in contaminated water, can absorb heavy metals like cadmium and arsenic. This is precisely why cultivation environment matters — Mankai grown in controlled, monitored systems avoids this issue entirely. The EFSA assessment specifically evaluated cultivated Mankai, not wild-harvested plants.
EFSA did flag that manganese levels in this plant's dried powder are higher compared to most common foods. For most healthy humans this isn't a practical concern, but worth knowing. Additionally, Mankai contains phylloquinone (vitamin K), which can interact with anticoagulant medications like coumarins — check with your doctor if you're on blood thinners.
The safety profile looks solid. It is even safe for seniors to consume.
Where Can You Find Wolffia Globosa?
If you're in Thailand, Myanmar, or Laos — it's often right there in local markets. Fresh, inexpensive, and eaten as a vegetable. In Isan cuisine it's incorporated into meals much like other vegetables — greens you throw into a soup or stir into a dish without much thought.
In the US? Harder. Wild duckweed isn't something most Americans will stumble across. What's been making its way into the American market is primarily the cultivated Mankai strain — usually in powder or frozen cube form, designed to be added to smoothies, shakes, soups, or other foods without dramatically changing flavor. Mankai has a notably neutral taste, which makes it more flexible than most greens.
Where to Buy Mankai in the US
Mankai has been available as a food ingredient in the US since around 2019, typically incorporated into plant-based products — protein shakes, meat alternatives, and fortified foods.
Finding it as a standalone product you can add to your daily routine is harder. There are not a lot of reliable places to purchase wolffia globosa in the West.
That's a gap Wolfa is working to close — sourcing Wolffia globosa from established farms in Thailand and bringing it to the American market in a format that's actually easy to use every day. Join the waitlist at mywolfa.com to be notified when we launch.
Mankai and the Green Mediterranean Diet
One big reason researchers started taking Mankai seriously is the DIRECT-PLUS trial — an 18-month randomized controlled study published across multiple peer-reviewed journals, involving 294 participants. A follow-on study on fecal microbiota transplantation used the same participant group, extending the research further.
The study compared three diet approaches in a population whose typical foods were high in processed meat and low in plant-based foods: standard healthy dietary guidelines, a traditional Mediterranean diet, and a Green Mediterranean diet. The Green Mediterranean group consumed a daily Mankai green shake (100g frozen plant), green tea (3-4 cups daily), and walnuts, while avoiding red and processed meat.
Across the published results, the Green Mediterranean diet showed:
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Greater weight loss (6.2 kg average) and waist circumference reduction than both comparison groups
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Improved LDL cholesterol and blood pressure readings
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Better glycemic control and insulin resistance markers
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Roughly double the intrahepatic fat reduction compared to the standard Mediterranean diet group
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Slower hippocampal volume decline in participants over 50
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Additional weight loss maintenance through gut microbiome changes that persisted after the diet phase
The research tested the Green Mediterranean diet as a whole, not Mankai in isolation. But across multiple sub-analyses, higher Mankai intake specifically correlated with better outcomes — slower hippocampal atrophy, lower weight regain after the diet phase, and improved metabolic markers.
That's a meaningful signal, backed by published research.
How Mankai Is Farmed vs. Wild Duckweed
The farming difference is the clearest practical distinction between the two.
In the wild, Wolffia globosa grows in ponds and lakes, driven by local water conditions, seasonal light, temperature, and whatever nutrients happen to be present. That produces a plant with variable nutrition that's difficult to standardize — and, in contaminated water systems, potentially problematic.
Mankai is grown in closed aquatic greenhouses with monitored water quality and controlled nutrient inputs. The result is consistent nutrition batch after batch — which is what makes it viable as a supplement ingredient rather than just a fresh vegetable.
Mankai also doubles its mass roughly every 48 hours under optimal conditions. It grows in vertical aquatic systems. It requires very little water compared to conventional protein crops like soy, doesn't need acres of farmland, and produces no waste in optimized cultivation. For an increasingly strained global food system, those are real advantages.
The Bottom Line: Same Plant, Different Standard
Same species. Different application.
Wolffia globosa is the plant. Mankai is what happens when you take that plant, grow it under controlled conditions, and verify through real human research that it actually delivers what it promises.
This tiny aquatic plant packs more nutrients per serving than almost any other whole foods option — complete protein with all nine essential amino acids, bioactive vitamin B12, and iron, in a form with a neutral taste that fits into almost any diet.
For people focused on plant-based protein, vitamin B12, iron, and folate from a real whole food — the Mankai cultivar is what the published studies are built on. Not vague references to "duckweed." Specifically Mankai, specifically cultivated, specifically tested in humans.
Wolffia globosa has been nourishing communities in Southeast Asia for centuries. Mankai is what happens when modern nutrition research finally catches up.
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