Koji is a type of fungus (Aspergillus oryzae) used in eastern Asia for fermenting foods. It’s the primary ingredient behind many popular Japanese items like soy sauce, miso, and sake.

Is Koji vegetarian or vegan?

Yes, Koji is plant-based and suitable for both vegetarian and vegan diets.

What does Koji taste like?

It brings a sweet, rich, and umami flavor that enhances the original taste of foods.

Yes, Koji itself is gluten-free, but always confirm as it can be used in products that do contain gluten.

Can Koji be used in bread baking?

Yes, Koji can be used to naturally leaven bread, contributing to its texture, flavor, and shelf life.

How is it traditionally made?

Koji is traditionally made by inoculating steamed grains, usually rice, with the Aspergillus oryzae spores.

Is it safe to eat Koji?

Yes, Koji is safe to eat. It has been used for centuries in Asian cuisines.

How can you store Koji?

It can be stored in a cool, dark place like a pantry or the refrigerator, making sure it’s well sealed to avoid moisture.

Can I make Koji at home?

Yes, with the right environment and materials, you can make Koji at home.

What are some common dishes that use Koji?

It is used in making miso, Sake, rice vinegar, soy sauce and to ferment meats, fish and vegetables.

Are there health benefits associated with Koji?

Koji aids in digestion, provides a good source of protein, and is rich in vitamins and minerals

Is Koji the same as mold?

Koji is a type of beneficial fungus or mold, but not all molds are Koji.

What does Koji do to food?

Koji breaks down the proteins, carbohydrates and fats in food, enhancing the taste and making them easier to digest.

What is the relationship between Koji and Umami?

Koji helps produce a rich umami flavor in foods through the process of fermentation.

Is there a western equivalent to Koji?

Although there isn't a direct western equivalent, the concept of using yeast and bacteria in bread-making and cheese-making is similar.

Where can I buy Koji?

You can buy it at Weee! Asian Market, www.sayweee.com.

FAQ

What is the minimum order for free delivery?

Free delivery starts at $35 in most areas. The exact minimum may vary by region and will be shown at checkout.

How fast is delivery?

Most orders are delivered within 1–2 days depending on your location. You can select your delivery date at checkout.

Do you have physical store locations?

No, we are 100% online. By operating without physical stores, we keep prices lower and pass the savings to you.

Where do you deliver?

We currently deliver to all 50 U.S. states. Enter your ZIP code to confirm availability in your area.

Are there deals for first-time customers?

Yes! New customers can enjoy exclusive first-order discounts and special promotions.

Where to buy koji near me?

Asian American store with
free delivery available*

*Orders above $35, varies by region

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Top 5 products for Koji

#1

Cold Mountain Rice Koji 20 oz

Rich rice koji offers natural enzymes and probiotics that boost umami, sweetness and digestibility. Ideal for miso, sake, amazake, pickles, salad dressings or marinades, delivering a deep, nutty flavor while supporting gut health.

$10.29 - $11.99

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This was my first time buying dried rice koji, and when I made amazake (sweet rice drink) with it, it turned out delicious! It's so versatile, I really appreciate it.
akikojapanosaka
I thought this was the one already made (liquify). But I can make it; therefore, it’s fine. It does not have any alcohol like the other kind that is ready to use. I like no additive products.
kyoko.o.redd
I've been using koji imported from Japan until now, but I bought American-made koji for the first time because of the good reviews.
goshibata
There were so many! I'm looking forward to using them.
iser200229
It arrived in perfect condition. I've been using this brand for a long time.
NoriAso
Made “amazake” by rice cooker selected “keep warm “ mode. So sweet and yummy.
Maki
This is the product I was most looking forward to out of all the things I bought this time. I hope to be able to make shio koji and soy sauce koji to increase the variety of my cooking. I'm looking forward to it.
M&M
I used it to make miso, just like I would in Japan, and it produced delicious miso without any problems.
Mayumi

#2

Hikari Shio Koji (Japanese All Purpose Seasoning) 20.4 oz

A versatile addition to your pantry, Hikari Shio Koji is an all-purpose seasoning, making it the perfect match for a query on Koji. It's a critical ingredient in numerous Asian dishes, imparting a sweet, savory umami flavor to marinades and sauces. This Koji seasoning enhances the taste of sushi, sashimi, grilled fish, and pickles. As a natural tenderizer, Hikari Shio Koji also healthily replaces salt, maintaining the nutrients and improving digestion. This is your key to authentic Japanese cuisine.

$8.99 - $11.49

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It's really delicious when used to marinate and then grill salmon or chicken. It's so versatile that I always keep it in the refrigerator. I'm sure there are many other ways to use it, so I want to make the most of it and enjoy Japanese food.
Magnolia
This is my repeated item. I often use this for pork, chicken and fish. Easy to use so I can save my time for cooking!
Lake Las Vegas
First time ordering this. It was delivered cold.
mitz1961
Love to use to marinate chicken
staniguchi2010
I saw a review saying this made bacon very tender and delicious, so I bought some to try. However, it turned out to be powdery and not quite what I expected.
Effie菲
This is my second purchase. It's convenient because it can be used for marinating pork and fish, and for anything else.
weee.7064
This will be a great marinade for chicken thighs. I can’t wait to cook with it.
tammy
This was my first time using it, and I'm glad that it made the meat really tender and delicious.
oruhiiiii
It's delicious for marinating chicken and shrimp! It will be a staple in the refrigerator.
TinaHuang
Good marinade.
weee.10441606

#3

Iseso Miyako Koji 500 g

Premium Koji delivers rich umami and natural sweetness, ideal for homemade miso, soy sauce, sake, and marinades. Boosts probiotic content, supports digestion, and adds depth to ramen, pickles, and grilled fish. Perfect for Japanese chefs seeking authentic flavor. Boosts soups, sauces, desserts too.!

$10.79 - $12.99

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This price for 500g is a great deal. I'm happy it's cheaper than on Amazon. I've been focusing on improving my gut health lately, so I've been grinding this into a powder in a blender and mixing it with curry powder to make a curry koji powder seasoning. I've also decided to mix it with garlic powder and powdered ginger to make a Chinese-style seasoning and keep it on hand. I'm looking forward to trying out different dishes.
sntenjoy
Whenever I find koji at Weee, I always buy it. I'm grateful because I don't get to go shopping very often.
tstroh01
Apparently it's good to grind koji into powder in a blender and mix it with salt, soy sauce, and other spices to use in cooking, so I bought some for the first time! It's great value because it can be used in a variety of dishes
Mami
In perfect condition, no damage, I accept!
shoplayp
I bought this with health in mind. I plan to use it to make amazake, shio koji, soy sauce koji, etc.
keikodayoo
It was on sale so I bought a lot. I'm going to make amazake!
suzuchan
I always use this rice koji to make amazake. It's twice the price on Amazon, so it's a big help!
weee.14252386
This is my first purchase, and I'm happy that I was able to buy it cheaper than elsewhere!
weee.16627216
Prepare the chickpea miso.
yukaboo
The only thing the supermarket sells is red miso, which I don't like, and it's expensive! (A small pack costs $15.) I bought koji and made white miso. I like my white miso sweeter, so I added a little more. Making it myself is cheap, you can make a lot, and best of all, it's delicious! I'm proud of myself!
yokoflores721

#4

IseSo Miyako Handmade Rice Koji 1kg 1 count

Premium rice koji provides natural enzymes for fermentation, delivering deep umami and sweet‑sour notes. Ideal for miso, shio koji, sake, pickles, and marinades in Japanese and Korean dishes. Boosts digestion and nutrition, making it a versatile pantry staple. Great for home cooks seeking deep umami.

$19.49

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I made soy sauce koji I made it once and it was delicious, so I made it a second time~
kaorumase
I am excited to make Amazake (Rice Koji Drink) with it. There are many recipes that I can try with Koji...making miso, pickles..etc.
Kumiko
I am very happy to be able to buy the rice koji that I have missed for a long time on weee.
iw
I made miso this month too I'm grateful that the recipe for miso is displayed I bought two bags, so I'm thinking of making shio koji or soy sauce koji too.
kaorumase
I always use this koji to make homemade miso and other koji seasonings. Even though it is dried koji, it is very soft and easy to use!
gmidori214
I always bought it from a certain major website, but I'm happy to be able to buy it cheaply here! At home, we make our own salt koji, soy sauce koji, miso, etc., and Miyako Koji is an essential item, so it's very helpful
aonigirii
I prepared Shio Koji!
May

#5

Marukome Hana Koji Miso 650 g

This koji is a crucial ingredient in Asian dishes like miso soup, marinades, and pickled vegetables. Marukome Hana Koji Miso boasts a robust, savory flavor, enhancing the depth of your meals. Koji holds health benefits, including aiding digestion and boosting immunity. Its 650g size offers great value, ensuring you have enough for various delectable recipes.

$6.09 - $8.29

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The case got pretty crushed.
rietillman1
This is the best miso!
Sebastian
This is what we have every time at our house.
MO
This is my second time ordering this Miso paste. Sweet, mild, good flavor. Great price too!
Koyuki
It's cheap and delicious! I always keep it stocked in my refrigerator.
moi
The usual price has gone up, so I'm going back to it after a long time.
always30way
Has a very good flavor
Who
This miso is great for soups! Great taste.
Lauren
Beika City reminded me of Detective Conan.
Yi-Lin

Popular recipes

Instant Pot Koji Chicken

Deliciously tender, this recipe uses to bring out the subtle flavors of chicken in the Instant Pot. Packed with protein, it's a healthy and satisfying main dish. You will need chicken thighs, , soy sauce, garlic and scallions.

Koji Stir-Fry Vegetables

A quick, easy and delicious recipe to level up your stir-fry. Using in this recipe creates a unique deep flavor in your favorite vegetables. The essentials for this recipe are mixed vegetables, , sesame oil, garlic and soy sauce.

Koji Miso Soup

A twist on a classic, this Koji Miso Soup is simple, hearty and full of good-for-you ingredients. Adding to the traditional recipe brings the dish to a whole new level. This recipe requires water, , miso paste, tofu and green onions.

Rice Cooker Koji Rice

Let the rice cooker do all the work in this simple, satisfying dish that showcases the unique flavor of . Trust us, it takes plain rice to a whole new level. All you need is rice, , water, salt and sesame oil.

Koji Marinated Tofu

A simple, but flavor packed dish where tofu gets a big upgrade from . Super easy to prepare and results in a delicious and complex-flavored tofu. You'll need tofu, , soy sauce, garlic and green onions.

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Frequently asked questions

What is Koji?
Koji is a type of fungus (Aspergillus oryzae) used in eastern Asia for fermenting foods. It’s the primary ingredient behind many popular Japanese items like soy sauce, miso, and sake.
What does Koji taste like?
It brings a sweet, rich, and umami flavor that enhances the original taste of foods.
Can Koji be used in bread baking?
Yes, Koji can be used to naturally leaven bread, contributing to its texture, flavor, and shelf life.
Is it safe to eat Koji?
Yes, Koji is safe to eat. It has been used for centuries in Asian cuisines.
Can I make Koji at home?
Yes, with the right environment and materials, you can make Koji at home.
Are there health benefits associated with Koji?
Koji aids in digestion, provides a good source of protein, and is rich in vitamins and minerals
What does Koji do to food?
Koji breaks down the proteins, carbohydrates and fats in food, enhancing the taste and making them easier to digest.
Is there a western equivalent to Koji?
Although there isn't a direct western equivalent, the concept of using yeast and bacteria in bread-making and cheese-making is similar.

Is Koji vegetarian or vegan?
Yes, Koji is plant-based and suitable for both vegetarian and vegan diets.
Is Koji gluten-free?
Yes, Koji itself is gluten-free, but always confirm as it can be used in products that do contain gluten.
How is it traditionally made?
Koji is traditionally made by inoculating steamed grains, usually rice, with the Aspergillus oryzae spores.
How can you store Koji?
It can be stored in a cool, dark place like a pantry or the refrigerator, making sure it’s well sealed to avoid moisture.
What are some common dishes that use Koji?
It is used in making miso, Sake, rice vinegar, soy sauce and to ferment meats, fish and vegetables.
Is Koji the same as mold?
Koji is a type of beneficial fungus or mold, but not all molds are Koji.
What is the relationship between Koji and Umami?
Koji helps produce a rich umami flavor in foods through the process of fermentation.
Where can I buy Koji?
You can buy it at Weee! Asian Market, www.sayweee.com.

This was my first time buying dried rice koji, and when I made amazake (sweet rice drink) with it, it turned out delicious! It's so versatile, I really appreciate it.
akikojapanosaka
I thought this was the one already made (liquify). But I can make it; therefore, it’s fine. It does not have any alcohol like the other kind that is ready to use. I like no additive products.
kyoko.o.redd
I've been using koji imported from Japan until now, but I bought American-made koji for the first time because of the good reviews.
goshibata
There were so many! I'm looking forward to using them.
iser200229
It arrived in perfect condition. I've been using this brand for a long time.
NoriAso
Made “amazake” by rice cooker selected “keep warm “ mode. So sweet and yummy.
Maki
This is the product I was most looking forward to out of all the things I bought this time. I hope to be able to make shio koji and soy sauce koji to increase the variety of my cooking. I'm looking forward to it.
M&M
I used it to make miso, just like I would in Japan, and it produced delicious miso without any problems.
Mayumi
It's really delicious when used to marinate and then grill salmon or chicken. It's so versatile that I always keep it in the refrigerator. I'm sure there are many other ways to use it, so I want to make the most of it and enjoy Japanese food.
Magnolia
This is my repeated item. I often use this for pork, chicken and fish. Easy to use so I can save my time for cooking!
Lake Las Vegas
This price for 500g is a great deal. I'm happy it's cheaper than on Amazon. I've been focusing on improving my gut health lately, so I've been grinding this into a powder in a blender and mixing it with curry powder to make a curry koji powder seasoning. I've also decided to mix it with garlic powder and powdered ginger to make a Chinese-style seasoning and keep it on hand. I'm looking forward to trying out different dishes.
sntenjoy
Whenever I find koji at Weee, I always buy it. I'm grateful because I don't get to go shopping very often.
tstroh01
Apparently it's good to grind koji into powder in a blender and mix it with salt, soy sauce, and other spices to use in cooking, so I bought some for the first time! It's great value because it can be used in a variety of dishes
Mami
In perfect condition, no damage, I accept!
shoplayp
I bought this with health in mind. I plan to use it to make amazake, shio koji, soy sauce koji, etc.
keikodayoo
It was on sale so I bought a lot. I'm going to make amazake!
suzuchan
I always use this rice koji to make amazake. It's twice the price on Amazon, so it's a big help!
weee.14252386
This is my first purchase, and I'm happy that I was able to buy it cheaper than elsewhere!
weee.16627216
Prepare the chickpea miso.
yukaboo
The only thing the supermarket sells is red miso, which I don't like, and it's expensive! (A small pack costs $15.) I bought koji and made white miso. I like my white miso sweeter, so I added a little more. Making it myself is cheap, you can make a lot, and best of all, it's delicious! I'm proud of myself!
yokoflores721
I made soy sauce koji I made it once and it was delicious, so I made it a second time~
kaorumase
I am excited to make Amazake (Rice Koji Drink) with it. There are many recipes that I can try with Koji...making miso, pickles..etc.
Kumiko
I am very happy to be able to buy the rice koji that I have missed for a long time on weee.
iw
I made miso this month too I'm grateful that the recipe for miso is displayed I bought two bags, so I'm thinking of making shio koji or soy sauce koji too.
kaorumase
I always use this koji to make homemade miso and other koji seasonings. Even though it is dried koji, it is very soft and easy to use!
gmidori214
I always bought it from a certain major website, but I'm happy to be able to buy it cheaply here! At home, we make our own salt koji, soy sauce koji, miso, etc., and Miyako Koji is an essential item, so it's very helpful
aonigirii
I prepared Shio Koji!
May
The case got pretty crushed.
rietillman1
This is the best miso!
Sebastian
This is what we have every time at our house.
MO
love it
Lin
Perfect for miso soup. Nice balanced flavor
weee.10460979
No additives, most natural, and tastes good too.
Nicoleair
Very nice balanced flavor.
weee.10460979
The best miso paste
Briana
This miso isn't too sweet and is just to my family's liking.
azusa18
Great size and taste
terryycheung
The miso in this series is delicious.
Thanks Weee
This is bigger than I thought. Love the favor
jennylee1126
Haven’t tasted it yet but should be good: real simple ingredients without any artificial additives. Love the quality!
kyoko.o.redd
I just received it today, and there's only a little over a month left on the deadline. This is outrageous!
mikiwu
First time trying Koji miso. Can’t wait to make my miso soup.
yp2466
It's great for making miso soup
Crystal
It tastes the same as the Marukome Koji Miso I buy in Japan, so I keep buying it!
point.masae
Very well packaged
hnthang9396
I love this miso paste, which I use to make miso soup. I also use it to marinate fish before grilling.
AileneEvans
I drink it when I get hungry in the middle of the night or mix it into my oatmeal and eat it!
ImeSP
It was just as delicious as regular miso. It contains dashi, so it's easy to use and very helpful.
Dhhdhfjdxo
Very delicate, very convenient to put tofu in soup.
琳
I had miso soup and it was delicious.
greatjenny.jung