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How to make soy-free natto at home easily and inexpensively that is rich in Vitamin K2 and therapeutic soil-based probiotics.
Natto is a critical traditional food to include in your diet, yet most traditional foodies ironically have never tried it.
Natto is a form of fermented soy and is one of the few (only?) cultured foods that contains a beneficial, soil-based bacterium.
In the case of natto, it is the powerful gut cleanup crew known as Bacillus subtlis.
Tempeh and miso also contain soil-based microbes, but they are the molds Rhizopus orzae and Aspergillus oryzae, respectively, which can cause allergic issues for some people.
Kefir made with live grains (not powder starter) contains dozens of strains of beneficial bacteria and candida-busting yeasts. Surprisingly, none of these strains are soil-based according to my research.
Thus, it may come as a surprise that eating a variety of fermented foods but excluding natto will likely leave a huge gap in your probiotic experience.
Soil-based bacteria are very important for gut restoration (aka, healing leaky gut) as well as optimal intestinal maintenance.
For example, those on the GAPS diet will likely plateau in their healing journey if they don’t either eat natto or take a therapeutic SBO probiotic (I suggest this brand).
Since SBO probiotics are some of the most expensive on the market, it is a good idea to make natto yourself.
You will save a bundle!
I actually love the taste of natto and eat 1-3 tablespoons of my homemade soy-free versions most days.
Word to the wise…natto is definitely an acquired taste! Most people do *not* like it at first!
I prefer to eat soy-free natto made from fermented mung beans (you can use other types of legumes if desired).
Mung bean natto visually and texturally best mimics soybean natto to my palate.
If you wish to eat natto everyday like I do, using a legume other than soy is wise as it avoids the thyroid-suppressing effects of soy which remain even if fermented.
If I do eat soy-based natto, I keep it to a teaspoon or less to avoid any goitrogenic risks.
Bonus! Natto not only contains elusive soil based organisms (SBOs). It also contains more Vitamin K2 than any other food!
Only 2 tablespoons of natto contains over 200 mcg of MK-7 (fermented form of Vitamin K2)!
So making your own natto and eating it regularly may permit you to forgo expensive K2 supplements as well.
Preparation Tip
I do not recommend making natto with any type of sprouted legume.
The results turn out mushy!
The consistency and texture of soy-free natto turn out the best when you soak your unsprouted legume of choice overnight, cook until just soft, and then initiate the fermentation process while the beans are still warm.
Homemade Soy-free Natto
How to make natto at home easily and inexpensively with mung beans instead of estrogenic soybeans.
Instructions
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Rinse mung beans and place them in a large glass bowl. Cover with enough filtered water to allow the beans to roughly double in size as they expand. Leave on the counter for 8 hours or overnight.
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Drain the soaking water and place beans in a large pot. Cover with fresh filtered water.
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Bring the beans to a boil, turn down the temperature to a simmer, affix the lid and cook the beans for about 20 minutes until just soft but not mushy (do not overcook!).
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Drain the beans and place in a large VitaClay slow cooker or crockpot. The beans should be no more than 1″ in depth. Discard any beans that may accidentally spill during the transfer from the pot to a VitaClay (or other slow cooker).
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Let the beans cool for 10 minutes in the Vitaclay.
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While the beans are cooling slightly, dissolve a packet of natto starter in 3 Tbsp of warm filtered water.
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Pour the natto spore solution over the cooled but still warm beans. Stir gently to mix with a clean, bamboo spoon.
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Place the lid on the VitaClay and select the “yogurt” setting.
If using a different type of slow cooker, use the setting that will keep the beans between 100-110 °F/ 38-43 °C which is the temperature range necessary to ferment the beans into natto.
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After 24 hours, turn off the Vitaclay, remove the lid, and cool the natto to room temperature for 1 hour. A whitish film and an ammonia-like aroma means they are done. The beans will also have a stringy and slimy appearance (see photo above).
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Place the cooled natto in a glass container with a tight-fitting lid and refrigerate.
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Natto will be ready to eat once refrigerated overnight. It will last for months, and the flavor will age and strengthen with time.
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Mung beans contain less than 1% of the isoflavones in soy. Thus, feel free to eat 1-3 tablespoons per day of mung bean natto for an inexpensive and tasty soil-based probiotic and Vitamin K2 food source.
Nutrition Facts
Homemade Soy-free Natto
Amount Per Serving (1 Tbsp)
Calories 23
Calories from Fat 9
% Daily Value*
Fat 1g2%
Saturated Fat 0.1g1%
Polyunsaturated Fat 0.5g
Monounsaturated Fat 0.4g
Potassium 33mg1%
Carbohydrates 2.5g1%
Fiber 2g8%
Protein 1g2%
Calcium 4.5mg0%
Iron 0.2mg1%
* Percent Daily Values are based on a 2000 calorie diet.
