Tonic Defensive Qi

玉屏风散 | Yu Ping Feng San | 60 tablets

A traditional formula for immunity, resilience, and seasonal defence

Ingredients: Astragali Radix (Huang Qi), Atractylodis Macrocephalae Rhizoma (Bai Zhu), Saposhnikoviae Radix (Fang Feng)

Tonic Defensive Qi (Yu Ping Feng San) supports the body when immunity feels low, sweating comes too easily, and colds or seasonal sensitivities keep returning. Zhu Dan-Xi first recorded it in Dan Xi Xin Fa (Teachings of Zhu Dan-Xi) in 1481. Practitioners have long chosen it to strengthen Wei Qi, the body’s defensive energy. It remains a trusted choice for those who want better long-term resistance and resilience.

When to use it

In Traditional Chinese Medicine, practitioners choose Tonic Defensive Qi when the body’s outer defence feels weak and no longer protects as well as it should. Colds may come more often. Sweating may happen too easily. Wind and cold may affect the body more quickly. Some also notice fatigue, pale complexion, hay fever-type sensitivity, or a tendency to get sick easily.

Many choose this formula when they want to build stronger resistance over time. It suits those who catch colds easily, feel run down after seasonal changes, perspire without much exertion, or want steadier immune support. It works best as a preventive formula rather than an acute one.

Why it stands out

What makes Tonic Defensive Qi so useful is its simple and focused role. It does not try to do everything at once. It strengthens the body’s surface defence, helps secure the pores, and supports the systems that help the body resist repeated external invasion. This makes it a strong choice for natural support when immunity feels weak, the body sweats too easily, or seasonal illness keeps returning.

A practical seasonal strategy

Tonic Defensive Qi is best known as a formula for building resistance over time. Benefits usually develop gradually. Many start noticing fewer or milder respiratory infections after about a month. Stronger preventive benefits often appear after several months of consistent use.

For seasonal flu prevention, Tonic Defensive Qi helps build long-term resistance. 

Research

Research on Tonic Defensive Qi has shown encouraging results in immune support, allergic rhinitis, recurrent respiratory infections, and broader immune regulation. Studies have reported increases in IgA and other immune markers, stronger natural killer cell activity, improved immune balance, and fewer recurrent respiratory infections in children. Research has also explored its relevance in allergic airway patterns and immune microenvironment regulation. This helps explain why it remains so relevant for long-term defensive support rather than only short-term symptom relief.

Important to know

Do not use Tonic Defensive Qi for acute colds and flu. Avoid exposure to cold and wind while taking it. Also avoid raw, cold, oily, and greasy foods.