Mitoku Traditional Natto Spores


Make real Japanese natto at home! Ferment soy beans with these spores to make traditional natto, or use nearly any bean of your choice.

Natto spores (natto-moto) are the starter culture used with soybeans to make traditional Japanese natto fresh at home.

  • Contains 0.1 oz (2.83 g) tube.
  • This powdered starter culture comes complete with a special measuring spoon.
  • Sufficient to inoculate approximately 50 pounds of soybeans to make approximately 88 pounds of fresh natto. 
  • The fermentation process requires the natto be kept at approximately 100°F degrees for 22 to 24 hours.
  • Additional instructions included. 


  • Japanese natural powdered natto starter spores (bacillus subtilis natto).

Allergen Information

  • Manufactured and packaged in a sterile laboratory.

Shelf life and Storage

  • The natto spores will last 6 months in the refrigerator or freezer; 3 to 4 weeks at room temperature.

What Our Customers Are Saying

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Customer Reviews

Based on 55 reviews
It Works!

My kids like natto a lot, but it feels bad to get all that packaging in the commercial natto for such a small amount so I was  excited to try this product. So glad it came with clear English instructions we’re looking forward to experimenting with different beans. We tried black soybeans first. I hope we can get the natto to be stickier.  It was satisfying  to be able to make it from scratch and for the kids to be able to eat as much as they liked, you can make a lot at once. We started out making a half quantity of the recipe with a one pound yield. If you follow the recipe you could make about 60 pounds of natto  with what you get in the package, and again I want to experiment with the method recipe, I’m fine making less and curious how to adjust it for stickiness and vary the beans.

Excellent pure product

Easy to use container dispenses well into the tiny measuring spoon. Has activated quickly and made 3 great batches so far. I'm a very satisfied customer Thanks

Natto Spores

We haven't even opened the package yet...still busy building the house.

Great quality natto starter

I have been making natto using this Japanese natto starter. It works fine with every batch. And this tiny bottle of starter lasts a long time. Will buy it again when the starter runs out.

1st Time & Success to Boot

As one previous reviewer had mentioned, I am lax on OCD sterilizing. (That said, I do clean the equipment etc and ensure food safety and sanitation)

Cutlures for Health did a good job by adding an instruction sheet in English. Plus the spores came in excellent condition and quality.

I am so happy that I can make Natto at home and use the ingredients I trust. Really adds a fun factor and saves me some money in the process.

Will definitely buy from Cultures for Health again!