1. Clearing away heat and toxic materials: Barley tea has the effect of clearing away heat and toxic materials, removing toxins from the body, improving the functions of the liver and kidneys, and helping to prevent diseases such as colds.

2. Lowering blood pressure and lipid: Barley tea is rich in β-glucan, which can lower blood pressure, blood lipid and cholesterol, and is beneficial to cardiovascular and cerebrovascular health.

3. Tonifying liver and kidney: Barley tea contains oxalic acid, lysine and other ingredients, which can tonify liver and kidney and improve human immunity.

4. Relieve indigestion: Barley tea has the function of clearing away heat and toxic materials, and can relieve symptoms such as gastrointestinal discomfort and indigestion.

5. Health care: Barley tea contains a variety of vitamins and minerals, which is beneficial for the human body to absorb and utilize nutrients and has the effect of health care.

Contraindications of barley tea:

1. People with cold constitution: Barley tea is cold and easy to cause diarrhea, abdominal pain and other symptoms, so people with cold constitution should drink it in moderation or avoid drinking it.

2. People with spleen and stomach deficiency: barley tea is cold and easy to damage the spleen and stomach, so people with spleen and stomach deficiency should try to avoid drinking it.

3. Pregnant women and lactating women: Pregnant women and lactating women should drink barley tea in moderation to avoid affecting the health of the fetus or baby.

4. Drink in large quantities: Barley tea contains oxalic acid. Excessive drinking can easily lead to oxalic acid poisoning, so it should not be drunk in large quantities.