Natto Starter


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

Each pouch contains 4 packets of natto starter culture. Each packet yields 6 cups of natto.​

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

Each pouch contains 4 packets of natto spores. Each packet yields 6 cups of natto.

  • Instructions are included and can be found here.


  • 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.

Customer Reviews

Based on 34 reviews
Dani Millay

This is my first time using Natto spores. I watched benefits videos and read several books in Natto making before I decided to make it. It can be pricey, so I wanted to get it right. The first batch not so hot...I only used one packs of starter. All recommendations said use more as the results would be much better and tastier Natto with more tendrils. I should have listened. The taste was not bad it was just under developed. So in the next batch I used three packets and voila! Perfect Natto (yeah) so other than the fact I had to use three x the amount it worked great on try two. I plan on oruchainh more spores and trying again with only one packet. I will let ya know. Until then happy fermentation experimenting.

Dani M.

Natto making success!!!!

First I must say thank you thank you thank you To cultures for health for making this product. Combination between natto spores and Instant pot on yogurt sitting after 12 hours I noticed some White film around each been. I wish I Could show you a picture, oh my God I did it yay!!!!!!! Easy and simple instruction definitely come back for more.

Rebeca Martinez
I didn’t receive my order :(

Wish I could make a review

Jennifer Flenner
Perfect Natto Spores

I've been making natto for a few weeks. I have made natto using spores from three different companies. When I use this natto starter it looks like it snowed on top of my natto and the neba neba strings are so thick that it's difficult to pull the natto beans apart. The difference between this product and others is significant and very visible. This is the freshest most easily activated spore I have found and it makes the tastiest natto! These spores are significantly better than any other I have used.

James B.
It worked!

I'd tried making natto three times before (with culture I bought elsewhere) and failed each time—it's a notoriously tricky ferment—but Cultures for Health's starter and instructions worked, and this morning I had fresh natto with miso rice and scallions. It was great!

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