Koji Amazake vs. Sake Lees Amazake: What's the Difference?

If you've recently discovered the magic of amazake, you may be surprised to learn that there are actually two very different types of this traditional Japanese drink: koji amazake and sake lees amazake. While both share the same name and a similar sweet flavor, they differ in origin, ingredients, and even health benefits. Here's how to tell them apart—and which one might be better for you.

What Is Koji Amazake?

Koji amazake is made by fermenting steamed rice with rice koji, a special mold (Aspergillus oryzae) used in Japanese fermentation. It's a naturally sweet, non-alcoholic drink that owes its flavor to the enzymatic breakdown of starches into sugars.
Key features:

• Made with rice and rice koji
• Naturally sweet (no added sugar)
• Alcohol-free
• Rich in enzymes, B vitamins, and amino acids
• Considered a functional food for gut and skin health

What Is Sake Lees Amazake?

Sake lees amazake, on the other hand, is made by mixing sake kasu (the leftover solids from sake production) with water and sugar. It has a similar sweetness but often contains a small amount of residual alcohol depending on preparation.
Key features:

• Made from sake lees + sugar + water
• Contains added sugar
• May contain low levels of alcohol
• Creamier texture, slightly stronger aroma
• Often enjoyed hot during winter

Main Differences at a Glance

Label Tips: How to Tell Them Apart in Japanese

If you're shopping in Japan or buying from a Japanese brand, here's how to identify the type of amazake:

• Look for labels with "糀甘酒" (koji amazake) or "麹甘酒" — these refer to rice koji-based, non-alcoholic amazake.
• Products simply labeled "甘酒" may be either type. Check the ingredients list.
• If you see "酒粕甘酒" (sake lees amazake), it usually contains sugar and may include alcohol, so it's best to avoid it for children or those sensitive to alcohol.

Which One Should You Choose?

Choose koji amazake if you:

• Want a drink that supports digestion, skin, and overall wellness
• Are avoiding added sugars or alcohol
• Want to give it to children or elderly family members

Choose sake lees amazake if you:

• Enjoy a stronger flavor and creamier texture
• Want a warming winter drink
• Don't mind a small amount of alcohol

Final Thoughts

While both versions of amazake have their place in Japanese culture, koji amazake is the better choice for those seeking a daily, health-supportive beverage. Its naturally sweet flavor, alcohol-free nature, and rich nutritional profile make it a favorite among wellness seekers and health-conscious families alike.

 

Next time you see "amazake" on a label, check the ingredients—now you know exactly what to look for.

🖋 Suggested Citation

Note: This article was created based on insights from the Japanese book “砂糖の代わりに糀甘酒を使うという提案” (Use Koji Amazake Instead of Sugar), authored by Kenji Maebashi and Kyoko Amako, published in 2020 by Ascom.