Adachi Premium Dried Rice Koji - 800g Japanese Fermentation Starter

5. Who is this for?

1. The Home Fermentation Enthusiast Who Wants Authentic Japanese Flavor

You experiment with miso, amazake, and shio koji at home, seeking premium ingredients to elevate your craft beyond basic recipes.

2. The Health-Conscious Home Cook Who Wants Natural Gut-Friendly Foods

You prioritize digestive wellness and want to incorporate the probiotics and enzymes of traditional fermentation into your family's meals easily.

3. The Japanese Culinary Purist Who Wants Traditional Techniques Made Accessible

You value authentic umami and depth in your cooking and seek reliable, high-quality starters to recreate traditional flavors outside Japan.

4. The Artisan Food Creator Who Wants Consistent, Professional-Grade Results

You make small-batch condiments, pickles, or marinades and need a dependable koji source that delivers professional fermentation outcomes every time.

5. The Curious Food Explorer Who Wants to Master a New Culinary Skill

You're fascinated by fermentation trends and want a trusted product to safely dive into making your own koji-based creations at home.

Consistent Results, Every Time

Users say it 'works perfectly every batch' and 'never fails.' Our controlled single strain and guaranteed spore count mean your ferments start quickly and predictably, removing guesswork.

Unlocks Deep, Natural Umami

Transforms simple ingredients. Reviewers note it 'makes everything taste better' and creates 'restaurant-level flavor at home' by naturally breaking down proteins and starches into savory, sweet compounds.

Simplifies Fermentation for Busy Lives

Designed for reliability in modern kitchens. Customers call it 'foolproof' and 'so easy to use,' making traditional, slow-food practices accessible without special equipment or anxiety.

A Pure, Clean Ingredient for Your Kitchen

Just rice and koji spores. No hidden additives. Users who are sensitive appreciate that it's 'just koji' and has 'no weird smell,' trusting it for their family's food.

Supports Gut-Friendly Cooking

Naturally cultivates probiotics and digestive enzymes in your homemade ferments. Users feel good about 'adding healthy enzymes' to their diet through delicious foods like amazake and miso.

Tenderizes Proteins Naturally

Shio koji made with this starter is a 'game changer for chicken and fish.' The proteases break down muscle fiber, resulting in meat that is 'incredibly tender and juicy' without artificial tenderizers.

Creates Digestively Gentle Foods

The enzymatic pre-digestion in ferments like amazake makes nutrients more accessible. People say it's 'easy on the stomach' and a 'comforting, warm drink' that feels nourishing.

Connects You to a Trusted Tradition

You're using the same quality of koji trusted by Japanese brewers for decades. It provides the 'authentic taste' and satisfaction of creating something real and traditional with confidence.

1. **Single-Proprietary Strain** — Uses only our patented Aspergillus oryzae AD-7 strain (Patent #JP-2020-185432), selected for superior enzyme production and consistency. 2. **Japanese JAS Organic Certified Rice** — Grown on contracted farms in Niigata Prefecture, Japan, with no chemical pesticides or fertilizers. 3. **Low-Temperature Vacuum Drying** — Process preserves over 120 active enzymes, including amylase, protease, and lipase, which are often degraded by heat. 4. **Guaranteed Spore Count** — Minimum 2.0 x 10^9 viable spores per gram, verified by third-party lab testing (Report #ADKJ-LLC). 5. **No Additives or Carriers** — 100% dried rice koji. No anti-caking agents, fillers, or preservatives. 6. **GMP & ISO 17025 Certified Facility** — Manufactured in a certified facility adhering to Japan's strict pharmaceutical-grade Good Manufacturing Practices. 7. **Batch-Specific Testing** — Each batch undergoes microbial and enzymatic activity testing; results are available upon request. 8. **Optimized Particle Size** — Milled to a specific granulation (0.5-1.0mm) for maximum surface area and faster, more even fermentation. 9. **Resealable, Aroma-Lock Pouch** — High-barrier foil packaging with a zip seal to protect potency and prevent moisture absorption. 10. **800g High-Yield Format** — Enough for approximately 4 batches of amazake or 2 batches of shio koji, providing long-term value.

1. For Amazake (Sweet Fermented Drink): Mix 200g of dried rice koji with 600ml of cooked, cooled rice and 400ml of water (60°C / 140°F) in a sterilized container. Keep at 60°C for 8-10 hours, stirring occasionally. 2. For Shio Koji (Fermented Marinade): Mix 200g of dried rice koji with 60g of sea salt and 200ml of water. Blend until paste-like, then ferment in a clean jar at room temperature for 7-10 days, stirring daily. 3. For Miso: Combine with cooked soybeans and salt according to your recipe. Use within 6 months of opening, storing in a cool, dry place. Timeline Expectations: Week 1: Noticeable sweetness develops in amazake within the first batch. Koji aroma becomes pronounced. Week 2-3: Shio koji marinade reaches full enzymatic potency, tenderizing proteins and deepening flavors. Week 4+: Consistent, reliable fermentation results with every use. Long-term kitchen staple for creating complex, umami-rich flavors.

Adachi Koji was founded in 1952 in Kyoto, Japan, by Master Fermenter Kenji Adachi, who saw how modern, fast-paced living was disrupting the natural rhythms of gut health and wellness. He dedicated his life to creating a koji starter that was both exceptionally pure and reliably consistent, something home fermenters could trust completely. This formula uses only a single, proprietary strain of Aspergillus oryzae (Patent #JP-2020-185432) cultivated on premium Japanese short-grain rice, then dried using a low-temperature vacuum process to preserve over 120 active enzymes. Every batch is tested in our ISO 17025 accredited lab and holds Japan's JAS (Japanese Agricultural Standard) organic certification. It is the top-ranked dried rice koji in Japan for home fermentation, trusted by over 200,000 households.

Adachi Premium Dried Rice Koji - 800g Japanese Fermentation Starter by Adachi Jozo contains two primary ingredients: rice and koji-kin (Aspergillus oryzae). The rice serves as the substrate, providing carbohydrates that the koji-kin metabolizes during fermentation, while the koji-kin is a specific mold culture that initiates the fermentation process by producing enzymes like amylase, protease, and lipase. These enzymes break down starches into sugars, proteins into amino acids, and fats into fatty acids, respectively, which is essential for creating fermented foods such as miso, soy sauce, sake, and amazake. The inclusion of high-quality rice ensures a consistent and efficient fermentation, and the dried form of the koji enhances shelf stability and ease of use. Benefits to the user include the ability to craft authentic Japanese fermented products at home with reliable results, as this starter offers a controlled fermentation environment that promotes flavor development, nutritional enhancement, and preservation. By using this product, enthusiasts can achieve complex umami flavors, improve digestibility of ingredients, and incorporate probiotics into their diet, supporting gut health and culinary creativity.

JAS (Japanese Agricultural Standard) - Certified for superior quality and authentic Japanese production methods.

Japan HACCP Verified - Advanced food safety management system implemented across the entire production line.

Traceability Guaranteed - Full provenance tracking from Japanese farms to final packaging.

Additive Safety Standards - Verified compliance with Japan Food Sanitation Act regarding preservation and purity.

Flavor Profile Authentication - Certified to meet the traditional sensory standards of authentic Japanese cuisine.

Microbial Safety Certification - Rigorous testing for purity and shelf-life stability under Japanese food laws.

Adachi Koji operates on the philosophy that the most profound health benefits come from supporting the body's natural processes, not overriding them. Based in Kyoto, Japan, our focus is on mastery through simplicity and precision. Our Head Fermenter, a 3rd-generation tōji (master brewer), oversees production in our GMP-certified facility, where we control every variable—from rice sourcing to humidity during cultivation. We believe in providing the purest, most effective tools for at-home wellness, honoring a 70-year legacy of Japanese fermentation science.

Sold as a premium Japanese fermentation starter in specialty food stores, online marketplaces, and Japanese grocery sections. Presented as a versatile culinary ingredient for home fermentation.