Black soybeans have been cultivated and enjoyed in Japan for more than a thousand years, valued not only as a nourishing food but also as a cultural treasure. During the Edo period, they were even presented as tribute to the Tokugawa shogunate—an honor that reflected their rarity and importance. Today, they remain a staple in Japanese cooking, often seen in traditional New Year’s dishes or enjoyed year-round in teas and snacks.

In Traditional Chinese Medicine, natural aging is closely tied to kidney health. According to traditional theory, black-colored foods are especially beneficial for the kidneys, and black soybeans are a classic example. They are believed to support healthy urination—one of the kidneys’ essential functions—making them helpful for easing fluid retention and relieving discomforts such as swelling (edema) or joint stiffness.

Beyond their role in TCM, black soybeans are also highly nutritious. They’re rich in antioxidants (especially anthocyanins), high-quality plant protein, dietary fiber, and essential minerals such as iron and potassium. Together, these nutrients support circulation, help fight fatigue, and contribute to overall vitality.

Black soybeans can be enjoyed in simple, delicious ways: roasted for a crunchy, satisfying snack, or brewed into a comforting kuromame tea, known for its mild, toasty flavor and gentle health benefits.

Yakuzen Classifications
Nature – Neutral (平)
Channels – Spleen (脾), Kidney (腎), Large intestine (大腸)
Flavor – Sweet (甘)

How do black soybeans help you?

1. Improve blood circulation and eliminate toxins
2. Improve urine flow and relieve fluid retention
3. Nourish yin and blood

Good for the following symptoms

1. Edema
2. Joint discomfort due to fluid retention
3. Irregular period due to iron deficiency
4. Fatigue

Cautions

It's very important to know about your body conditions before choosing foods.
Do not eat too much of particular foods at once.
Do not eat the foods you are allergic to.
There are foods to avoid if you are pregnant / have a disease. Ask your doctor before you start Yakuzen.