Natto Starter Culture | Nattokinase & Vitamin K2 | India's First | Zoh Probiotics

India's first Natto Starter Culture — the most potent probiotic food on earth, now makeable at home.

🌍 Ships next business day worldwide · 🇮🇳 1–4 days India · 🇦🇪 5–9 days UAE · 🇯🇵🇰🇷 5–9 days Japan/Korea · 🇸🇬🇲🇾 5–9 days SEA · 🇺🇸🇬🇧🇨🇦🇦🇺 7–14 days

Natto is a traditional Japanese fermented soybean food with a 1,000-year history. It is produced by fermenting cooked soybeans with Bacillus subtilis var. natto — a bacterium that produces an extraordinary range of bioactive compounds including nattokinase (a fibrinolytic enzyme studied for cardiovascular health), Vitamin K2 (MK-7, the most bioavailable form), and polyglutamic acid. Natto contains more Vitamin K2 per serving than any other food on earth — by a significant margin.

Until now, natto was virtually impossible to find fresh in India and expensive to import. Zoh has developed India's first Natto Starter Culture — authentic Bacillus subtilis var. natto, the same organism used in traditional Japanese natto production — so you can make it at home, fresh, for a fraction of the cost.

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The bioactive compounds in natto — what the science says

Nattokinase — a serine protease enzyme produced exclusively during natto fermentation. Research published in Scientific Reports, Hypertension Research, and other peer-reviewed journals has investigated nattokinase's ability to break down fibrin (a blood-clotting protein), with studies suggesting potential benefits for blood pressure, cardiovascular health, and thrombotic risk. It is not found in any other food or fermented product.

Vitamin K2 (MK-7) — natto contains approximately 1,000 mcg of Vitamin K2 per 100g, making it the single richest dietary source by an enormous margin. MK-7 is the most bioavailable form of K2, with a half-life of 72 hours (vs 1–2 hours for K1). Vitamin K2 is essential for calcium metabolism — directing calcium into bones and away from arterial walls — and is dramatically deficient in most modern diets, particularly across South Asia, the Middle East, and urban Southeast Asia. This alone makes natto one of the most nutritionally significant fermented foods you can add to a daily diet.

Bacillus subtilis var. natto — a spore-forming probiotic bacterium with exceptional gut-survival rates. Unlike most probiotics that are killed by stomach acid, Bacillus spores pass through the stomach intact and germinate in the intestine, producing bacteriocins that inhibit pathogenic bacteria including Clostridium and Salmonella species.

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What's inside

Freeze-dried Bacillus subtilis var. natto Starter Culture.
One packet inoculates up to 500g of soybeans. Natto ferments in 22–24 hours at 40–43°C in a warm, humid environment. The starter is highly concentrated — a small amount of finished natto from your first batch can be used to inoculate subsequent batches.

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How to make natto at home

Step 1 — Soak soybeans overnight (12–16 hours). Drain and steam or pressure cook until fully soft (45–60 minutes pressure cook).
Step 2 — While beans are still hot (above 70°C), mix starter culture in a small amount of water and coat the beans thoroughly. Heat kills competing bacteria — work quickly.
Step 3 — Transfer to shallow containers (not more than 3cm deep — Bacillus needs airflow). Cover with perforated film or a breathable cloth.
Step 4 — Incubate at 40–43°C for 22–24 hours. An oven with the light on, a yogurt maker, or a warm spot in summer heat all work. Humidity is important — place a cup of water in the incubation space.
Step 5 — Refrigerate for 12–24 hours after fermentation. This rest period develops the sticky threads (poly-gamma-glutamic acid) characteristic of authentic natto.
Step 6 — Eat within 5–7 days. Season with soy sauce, Japanese mustard, or try regional adaptations — natto with ghee and rice in India, with sambal in SEA, with za'atar in the Levant, or folded into a paratha.

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Natto across our key markets — why it matters where you live

India: Vitamin K2 deficiency is widespread — most Indians get adequate K1 (from vegetables) but very little K2, which is found almost exclusively in fermented foods and animal fats. The consequences: calcium deposits in arteries rather than bones, contributing to both osteoporosis and cardiovascular disease. Natto addresses this deficiency more effectively than any supplement.

UAE, Saudi Arabia, GCC: The same K2 deficiency pattern affects most modern Gulf diets — high in calcium-fortified foods but low in K2-rich fermented foods. Natto's cardiovascular and bone-density benefits are particularly relevant for the GCC's ageing expat populations and rising metabolic-disease rates.

Singapore, Malaysia, Indonesia, Thailand, Philippines: Tempeh-eating cultures already understand fermented soybean depth. Natto is the next frontier — different fermentation, different organism, dramatically different bioactive profile. Local Japanese expat communities and health-conscious city populations are natural early adopters.

Japan, Korea, Hong Kong: Authentic Bacillus subtilis var. natto sourced and tested at lab grade — ideal for home brewers who want consistency, expats abroad recreating familiar food, or wellness-focused households tracking nattokinase and K2 intake.

UK, US, Canada, Australia, EU: Fresh natto is virtually impossible to find outside major Asian groceries. Frozen imports lose enzyme activity. Making it at home with our starter is the only practical way to get fresh, daily natto with full nattokinase potency in these markets.

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Who is this for?

• Anyone interested in cardiovascular health and natural approaches to blood pressure and clotting
• People concerned about bone density and calcium metabolism (osteoporosis, ageing, post-menopause)
• Fermentation enthusiasts who want to explore the frontier of functional fermented foods
• Gut-health practitioners looking for Bacillus-based probiotics that survive stomach acid
• Japanese expats and Japanese-cuisine enthusiasts abroad who want fresh natto, not frozen imports
• Wellness communities tracking nattokinase or Vitamin K2 intake — fresh homemade natto is the most bioavailable form
• Anyone who has read about nattokinase supplements and wants the real food, not a capsule

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India's first. Authentic. Third-party tested.

Zoh is India's first fermentation cultures company — and the largest fermentation knowledge hub for South Asia, the Middle East, and Southeast Asia. This is the first authentic Bacillus subtilis var. natto starter culture available in India — not a substitute, not an approximation. The same organism, properly identified and tested. Every batch is verified for viable spore count and strain identity before dispatch.

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🌍 International shipping & delivery

We ship the next business day, every business day. Freeze-dried natto starter is shelf-stable at room temperature for up to 12 months and survives international transit easily — the spore form is exceptionally robust, far more so than typical probiotics. Delivery times by destination:

• India: 1–4 business days · free shipping on most orders
• UAE, Saudi Arabia, Kuwait, Qatar, Oman, Bahrain: 5–9 business days
• Singapore, Malaysia, Indonesia, Thailand, Philippines, Vietnam, Hong Kong: 5–9 business days
• Japan, Korea: 5–9 business days
• UK, Ireland, EU: 7–14 business days
• US, Canada, Australia, New Zealand: 7–14 business days
• Pakistan, Bangladesh, Sri Lanka, Nepal: 4–8 business days

Customs: Freeze-dried natto starter is classified as a food product (Bacillus spores in dormant form) and clears customs without issue in all the countries we ship to. We provide full documentation in every parcel.

Replacement guarantee: If your starter doesn't successfully ferment a batch within 36 hours of your first attempt, email us at info@zohprobiotics.com with a photo and we'll reship at our cost.

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Frequently Asked Questions

What is nattokinase and where does it come from?

Nattokinase is a serine protease enzyme produced exclusively by Bacillus subtilis var. natto during the fermentation of soybeans. It was first identified by Japanese researcher Dr. Hiroyuki Sumi in 1987. It is found only in natto — not in other soybean foods, not in other fermented foods, and not produced by any other microorganism. Nattokinase supplements are derived from freeze-dried natto extract. Fresh homemade natto contains nattokinase in its most bioavailable, active form.

How does natto taste — and how do people across our markets typically eat it?

Natto has a strong, pungent aroma (often compared to aged cheese or ammonia), a sticky, mucilaginous texture from polyglutamic acid threads, and a complex umami-forward flavour. It is an acquired taste for most people outside Japan. Indians often find it pairs well with ghee and hot rice, or mixed into a sabzi. SEA brewers add sambal, chilli oil, or pair it with rice and fried shallots. Levantine cooks try it with olive oil and za'atar. The flavour mellows after refrigeration and improves significantly from day 2 onward. Start with a small portion and try it warm — warmth reduces the intensity of the aroma.

Can I make natto with non-Japanese soybeans?

Yes. Indian, Indonesian, US, and Canadian soybeans all work well. Use whole, dry soybeans — not split or processed soy products. Smaller soybean varieties produce natto with better thread development. Organic soybeans are preferable to ensure no pesticide residue interferes with the fermentation. You can also experiment with other legumes — black gram (urad), chickpeas, and black-eyed peas all ferment successfully with Bacillus subtilis, though the flavour and thread formation differ from traditional soybean natto.

What temperature do I need to make natto?

Bacillus subtilis var. natto thrives at 40–43°C — warmer than most probiotic ferments. In Indian summers, GCC summers, and SEA tropical heat, ambient temperatures in enclosed spaces (insulated boxes, covered corners) can approach this range. A yogurt maker set to its highest setting, a pressure cooker with warm water as a heat bath, or a switched-off oven with a lamp all achieve the necessary temperature. Consistent temperature is more important than perfect temperature — avoid fluctuations during the 22–24 hour fermentation.

Is natto safe during pregnancy or for people on blood thinners?

Natto's high Vitamin K2 and nattokinase content means it can interact with anticoagulant medications (warfarin/Coumadin) — Vitamin K directly counteracts warfarin's mechanism. If you are on blood thinners, consult your physician before eating natto regularly. During pregnancy, Vitamin K2 is generally considered safe and beneficial, but consult your doctor for individual guidance. For all other healthy adults, natto is a safe and extraordinarily nutritious food.

Where can I buy natto starter culture in India and abroad?

Zoh Probiotics is currently the only company in India offering an authentic Bacillus subtilis var. natto starter culture. Previously, Indian and regional natto enthusiasts had to import starter cultures from Japan or the US at significant cost and with uncertain viability. Zoh's starter is cultivated in India, tested in India, and ships reliably across the country and internationally — to UAE, Saudi, Singapore, Malaysia, Indonesia, Thailand, Philippines, Hong Kong, Japan, Korea, UK, US, Canada, Australia, and most countries.

Will the starter survive shipping to UAE / Singapore / Japan / EU / US?

Yes. Bacillus spores are exceptionally robust — the spore form is one of nature's most resilient biological structures, able to survive heat, drought, and acid that would kill virtually any other organism. Freeze-dried Bacillus subtilis var. natto in particular has shelf life measured in years, not months. International transit through summer heat across the Gulf, SEA, and continental US is well within the starter's tolerance range. We've shipped successfully to every major city across our shipping zones without viability issues.