KAWASHIMAYA Natto Starter Spores Powder 3g — High‑Viability Bacillus subtilis, Makes 22–66 lb Natto

KAWASHIMAYA Natto Starter Spores Powder is a concentrated Bacillus subtilis natto culture in a 3 g packet designed to ferment between 10 and 30 kg (22–66 lbs) of soybeans for homemade or small-scale natto production.

This compact, laboratory-grade starter contains a high viability count (1×10¹⁰ CFU/g) and is packaged to preserve potency for reliable natto fermentation. Included with the powder are step-by-step written instructions delivered by email, an instructional video on the product page, and a small measuring spoon to help you dose precisely. The resealable pouch supports safe storage, but refrigerated or cool storage is recommended to maintain culture strength.

How much natto can I make with a single 3 g packet?

One 3 g packet of KAWASHIMAYA starter holds strong fermentative power and is intended to inoculate between about 10 and 30 kg of cooked soybeans, depending on your target inoculation rate. For home kitchens where smaller batches are typical, that translates to many individual servings over multiple uses.

• Typical yield range: 10–30 kg (22–66 lbs) of fermented soybeans.
• Recommended home batch sizes: 300 g–2 kg of beans per batch for easy handling.
• Use the included spoon for consistent dosing to match the desired yield.

What are the storage and handling instructions to keep the starter effective?

To preserve viability, keep the resealable pouch cool and minimize exposure to heat and moisture. Refrigerate upon arrival and after opening; for longer storage, a freezer is acceptable if you protect the pouch from condensation during thawing.

• Store in refrigerator or a cool, dry place immediately after receiving.
• Reseal the zip-lock pouch tightly after each use to prevent humidity intake.
• Airtight secondary container or freezer storage prolongs shelf life.

What support and resources come with the starter powder?

Buying this starter includes practical support to help you achieve consistent fermentation: an emailed step-by-step recipe and a how-to video hosted on the product page, plus a measuring spoon in the package. If you run into problems, the seller offers troubleshooting assistance and a satisfaction guarantee tied to successful natto making.

• Detailed emailed instructions for temperature, timing, and hygiene.
• Visual how-to video demonstrating inoculation and incubation techniques.
• Direct customer support and a refund policy if assistance does not resolve issues.

How do I use the powder safely and effectively in my kitchen?

Use clean, sanitized equipment and follow the provided instructions for cooking, inoculating, and incubating soybeans. Maintain recommended incubation temperatures and avoid cross-contamination by dedicating utensils or thoroughly sanitizing between uses.

• Cook soybeans until tender, cool to the recommended inoculation temperature, then stir in the starter evenly.
• Incubate in a warm, stable environment for the prescribed time to develop natto characteristics.
• Store finished natto refrigerated to slow fermentation and preserve texture and flavor.

Who is this for? KAWASHIMAYA Natto Starter Spores Powder is aimed at home fermenters, small food businesses, culinary educators, and anyone curious about making authentic natto from scratch. It fits experienced fermenters who want a high-strength Japanese strain for consistency, as well as beginners willing to follow step-by-step guidance and use the support resources included with purchase. The small packet size is convenient for testing and scaling recipes while keeping storage simple.

Ingredients

Bacillus subtilis natto