Ama Koji – The Sugar Alternative That’s Naturally Sweet & Gut-Friendly
- Hitomi
- Aug 9
- 2 min read
Updated: 2 days ago

CONTENTS
ABOUT THIS RECIPE | WHAT IS "AMA KOJI"?
Ama Koji (甘麹) is a naturally sweet fermented paste made from just rice koji and water—no added
sugar! Thanks to the enzymatic power of rice koji, the natural starches in the rice are broken down into simple sugars during fermentation, creating a mild, gentle sweetness. This traditional Japanese sweetener is a versatile, gut-friendly alternative to sugar that supports your health while adding flavor and depth to both sweet and savory recipes.
GUT HEALTH BENEFITS |
Rich in enzymes that help break down food and support better digestion
Naturally sweet without added sugar, making it a great alternative for those watching their blood sugar
Contains prebiotics that nourish the good bacteria in your gut
May support energy levels, immune health, and skin health due to its gentle fermentation process
Completely additive-free, gluten-free, and vegan
INGREDIENTS | (Makes about 550ml)
200g dried rice koji
350ml warm water (~60°C / 140°F)
INSTRUCTIONS |
Sterilize your tools: Place all utensils and containers in boiling water for at least 8 minutes. Use only heat-resistant, BPA-free glass or plastic. Let air dry completely.
In a sterilized container, combine the rice koji and warm water.
Mix gently to fully moisten the koji.
Keep the mixture at a consistent 55–60°C (131–140°F) using a yogurt maker, rice cooker on “keep warm,” or other low-temp setup for 6-8 hours.
Once fermentation is complete, blend with a hand blender or regular blender for a smoother consistency (optional).
Cool and Store: Let it cool, then transfer to a clean jar. Store in the fridge up to 7 days.
HOW TO USE AMA KOJI |
Stir into plain yogurt or plant-based yogurt
Add a spoonful to lattes, smoothies, or tea
Use in dressings, marinades, or sauces for natural sweetness
Replace sugar in baking recipes like muffins or pancakes
Drizzle over fruit, oatmeal, or rice porridge
SHOPPING TIPS |
RICE KOJI:

Look for dried rice koji at Japanese or Asian grocery stores in the refrigerated section or online. Brands like Cold Mountain, Marukome, or Hikari are reliable. Japanese supermarkets often carry a few different kinds of KOJI. Online retailers like Nijiya, Mitsuwa, Marukai, Amazon, or Japanese Pantry shops are good options!
FINAL THOUGHTS |
Ama Koji is a beautiful example of how traditional Japanese fermentation can offer both flavor and wellness benefits. With its natural sweetness, enzyme power, and gut-friendly properties, it’s an excellent replacement for refined sugar—perfect for anyone looking to reduce sugar while still enjoying sweet flavors.
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