Kombu — Nutrients, Health Benefits, And Shopping Tips

Kombu photo

Listonic Team

March 10, 2025

Kombu, a nutrient-rich seaweed, is celebrated for its impressive health benefits, including its high iodine, calcium, and iron content. Explore tips for choosing the freshest kombu and effective storage methods to preserve its nutritional value and vibrant flavor.

Nutrients

Check the detailed nutritional values of kombu, including information such as calories, fats, carbohydrates, and proteins per 100 grams of the product.

Nutrition facts

Amount per 100 g

Calories

🔥 43 kcal

Nutrients per: 100 g% Daily Value*
Carbs9 g3.27%
Fiber14 g50%
Sugars0 g-
Glycemic Index35 -
Protein2 g4%
Sodium520 mg22.61%
Total Fat1 1.28%

*The % of Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Key takeaways

🛒
Choose kombu that is dark green to black in color, with a firm and glossy texture, avoiding any that appear brittle or have a dull surface.
😋
Kombu, a type of edible kelp, is not only a key ingredient in Japanese dashi broth but also boasts a natural umami flavor due to its high glutamate content, making it a secret weapon for enhancing the taste of various dishes without added salt.
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To maintain the freshness of kombu, store it in an airtight container in a cool, dark place. For longer preservation, you can refrigerate it, but ensure it’s well-sealed to prevent moisture absorption.
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Kombu is a type of edible kelp that is a key ingredient in making dashi, a traditional Japanese broth that forms the base for many soups and sauces.

Health benefits

Discover the health benefits of kombu, a nutrient-rich seaweed that supports digestion, enhances thyroid function, and provides essential minerals for overall wellness.
  • Rich in iodine, which is essential for thyroid function and helps regulate metabolism.
  • Supports heart health by helping to lower cholesterol levels and improve circulation.
  • High in fiber, which aids in digestion and promotes a healthy gut.
  • Contains vitamins and minerals such as calcium, magnesium, and iron, contributing to overall nutritional balance.

Health risks

Understand the potential health risks associated with kombu.
  • High iodine content which can lead to thyroid dysfunction if consumed in excessive amounts.
  • Potential heavy metal accumulation as kombu can absorb toxins from the water, including arsenic and lead.
  • Digestive issues such as bloating and gas, particularly in individuals sensitive to high-fiber foods.
  • Allergic reactions in some individuals, which may cause symptoms like itching, swelling, or difficulty breathing.
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How to choose kombu

When choosing kombu, look for strips that are dark green to brown in color, as this indicates freshness and quality. The texture should be firm and slightly glossy, without any signs of excessive brittleness or discoloration.

Avoid kombu that appears overly dry or has a dull, faded color, as these may indicate age or poor storage conditions. Fresh kombu should have a briny, ocean-like aroma, while any off-putting smells may suggest spoilage, which can negatively impact the flavor of your dishes.

How to store kombu

To ensure your kombu stays fresh and retains its flavor, store it in a cool, dry place, preferably in an airtight container. Keep it away from moisture and direct sunlight, as these can degrade its quality and nutritional value. A pantry or a cupboard is an excellent choice for short-term storage. For long-term preservation, consider placing the kombu in the refrigerator or freezer, where it can last for several months without losing its properties.

Humidity can significantly affect kombu, leading to mold growth or spoilage. Avoid storing kombu in damp areas, such as near the sink or in a humid kitchen environment. Additionally, always check for any signs of discoloration or off smells before use, as these may indicate that the kombu has gone bad.

✅ Extra Tip

To enhance the umami flavor of your dishes, soak kombu in water for at least 30 minutes before cooking, and consider using the soaking liquid as a flavorful base for soups and broths.

How long does it last?

Kombu, a type of edible kelp, can last for a considerable amount of time when stored correctly. Dried kombu can remain usable for up to 2 years if kept in an airtight container in a cool, dark place. Once rehydrated, however, kombu should be used within 1-2 weeks if stored in the refrigerator. To maximize its shelf life, it's important to protect kombu from moisture and direct sunlight, as these factors can lead to spoilage. Freezing kombu is not typically recommended, as it may alter its texture, but proper storage can ensure that it retains its flavor and nutritional benefits for an extended period.

What to do with leftovers?

Leftover kombu is a fantastic ingredient that can enhance various dishes. After making dashi or broth, don’t discard the kombu; instead, chop it finely and incorporate it into stir-fries or salads for a boost of umami flavor. You can also add it to rice or grain dishes while cooking to infuse them with a subtle oceanic taste. If you have a larger quantity, consider making a kombu-infused pickled vegetable dish, which can serve as a flavorful side or condiment.

Another great use for leftover kombu is to blend it into sauces or dressings, where it can add depth and complexity. You can also simmer it in soups or stews to enhance the broth's richness. For a unique twist, try adding chopped kombu to homemade veggie burgers or grain patties for added texture and flavor. Lastly, if you find yourself with an excess of kombu, consider dehydrating it for later use, allowing you to enjoy its benefits long after your initial cooking session.

👨‍⚕️️ Medical disclaimer

The content on this website is for informational purposes only. No material on this site is intended to be a substitute for professional medical advice, diagnosis or treatment.

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