What Is Perilla Leaf?
Perilla leaf is the leaf of Perilla frutescens, an aromatic annual herb in the mint family that has been cultivated across East Asia for more than two thousand years. In Traditional Chinese Medicine (TCM) it is known as zi su (紫苏) — the deep purple-green leaves, and sometimes the stems and seeds, have a place in both the apothecary cabinet and the family kitchen.
If you have ever ordered Korean barbecue, you have probably seen perilla leaves on the table — broad, frilled leaves with a fragrance that sits somewhere between basil, mint, and anise. In China, perilla is pickled, stir-fried, and simmered with crab and fish. In Japan, it is the shiso leaf wrapped around sushi and tempura. This culinary versatility is matched by a long tradition of use in TCM, where perilla leaf is regarded as a gentle, warming herb that works on the exterior of the body and the middle of the digestive system.
TCM Properties of Perilla Leaf
Understanding how a food behaves in TCM starts with its nature, flavor, and the organ networks it is believed to influence. Perilla leaf is a textbook example of a warm, pungent herb.
Nature, Flavor, and Meridians
- Nature: Warm (温)
- Flavor: Pungent (辛), with a mild aromatic quality
- Meridians: Lung (肺), Spleen (脾), and Stomach (胃)
In TCM theory, pungent flavors have the ability to move and disperse — they "open" things up. A warm nature adds gentle heat. Together, these qualities make perilla leaf what TCM calls a release the exterior herb: it is traditionally used to help the body open the pores, encourage light sweating, and push out wind-cold that has settled on the surface of the body. Because it also enters the Spleen and Stomach, it works on the digestive system at the same time, which is why it is such a favorite for colds accompanied by an upset stomach.
Traditional Uses in TCM
Perilla leaf appears in classical Chinese medical texts, and its uses have been refined over centuries of practice.
Releasing Wind-Cold
At the very first sign of a cold — chills, a stuffy nose, a headache, and no sweating — TCM practitioners have traditionally reached for pungent, warm herbs to "sweat out" the invasion. Perilla leaf is milder than stronger herbs like ephedra (ma huang), which makes it especially suitable for early, mild wind-cold and for people who are constitutionally weaker. It is often combined with fresh ginger in formulas such as Xiang Su San (香苏散), a classic combination of perilla leaf and cyperus for wind-cold with stagnant qi.
Harmonizing the Stomach and Calming Nausea
Perilla leaf is one of the classic TCM remedies for nausea, vomiting, and poor appetite, particularly when they are linked to "dampness" or disharmony in the Stomach. This is why the herb shows up so often in recipes for morning sickness and motion sickness. In TCM theory, it works by moving stagnant qi downward and gently warming the middle burner, restoring the Stomach's ability to receive food.
Calming the Fetus (An Tai)
In classical TCM, perilla leaf is included in formulas for restless fetus and pregnancy-related nausea. It is believed to calm the fetus by harmonizing the Spleen and Stomach and settling rebellious qi. While this use has a long history, pregnant women should always discuss any herbal remedy with their midwife or doctor before using it, especially in concentrated medicinal doses.
Counteracting Fish and Crab Poisoning
One of the most practical traditional uses of perilla leaf is as a culinary antidote to "fish and crab poisoning" — the digestive discomfort, bloating, and queasiness some people feel after rich seafood meals. In TCM, shellfish and fish are considered cold and damp, and the warm, pungent perilla leaf is thought to balance them. This is why you will see perilla leaves tucked under steamed crabs in Chinese restaurants and served beside raw fish. Modern research has shown that perilla leaf extract has antimicrobial properties, which may help explain why this tradition persisted.
How to Use Perilla Leaf in Your Kitchen
Perilla is easy to incorporate into daily meals, whether you use fresh leaves from a garden or farmers' market, or dried leaves from an apothecary or Asian grocery.
1. Perilla Leaf Tea
The simplest way to enjoy perilla as a warming remedy:
- Dried leaves: 3–5 grams (about 1 tablespoon)
- Water: 250 ml freshly boiled
- Optional: 2–3 slices of fresh ginger, a teaspoon of honey
Place the leaves in a cup, pour over the boiling water, cover, and steep for 5–10 minutes. Strain and drink warm. This tea is traditionally sipped at the first sign of a chill or after a heavy seafood meal to settle the stomach. It is meant to be drunk warm — allow the gentle sweat to do its work, then rest.
2. Perilla in Soups and Congee
Add a handful of fresh perilla leaves to the last few minutes of cooking chicken soup, fish soup, or congee. The leaves wilt quickly and release a fragrant, herbaceous note that pairs beautifully with ginger and scallion. In TCM terms, this turns an ordinary meal into a gently warming, exterior-releasing bowl that is comforting when you feel under the weather.
3. Fresh Perilla as a Wrapper and Garnish
Fresh perilla leaves are wonderful wrapped around grilled meat, tucked into rice paper rolls, or torn over noodles and salads. Their clean, minty-basil flavor cuts through rich food and makes a naturally beautiful plate. Pickled perilla (often with plum or vinegar) is a classic side dish that aids digestion.
Selecting and Storing Perilla
Fresh: Look for vibrant leaves with no brown spots or wilting. Wrap them in a damp paper towel inside a plastic bag and store in the refrigerator — they keep for about 3 to 5 days. Wash just before use.
Dried: Buy from a reputable supplier; the leaves should be deep green to purple, aromatic, and free of stems and debris. Store in an airtight jar away from light and moisture, and use within a year. Dried leaves are stronger in flavor, so a little goes a long way.
Who Should Be Cautious with Perilla Leaf?
Perilla leaf is gentle, but TCM tradition advises caution in a few situations:
- Excess heat and yin deficiency: If you tend toward dry mouth, a dry cough, a red sore throat, or night sweats, the warming nature of perilla may not suit you.
- Heavy sweating: Because perilla promotes sweating, people who sweat profusely or who are already weak from fluid loss are traditionally advised to avoid it.
- Pregnancy: While perilla has a history of use for morning sickness, medicinal doses during pregnancy should only be taken under professional guidance.
- Medications: As with any herb, check with a healthcare provider if you take prescription medication, especially blood thinners or sedatives.
As always in food therapy, start with a small amount, observe how your body responds, and stop if anything feels off.
Frequently Asked Questions
What is perilla leaf (zi su) used for in TCM?
In TCM, perilla leaf is traditionally used to release wind-cold, promote light sweating, regulate qi, harmonize the stomach, and ease nausea. It is commonly used in the early stages of a cold with chills and to soothe digestive upset.
How do I make perilla leaf tea?
Steep 3–5 grams of dried perilla leaves in 250 ml of freshly boiled water for 5–10 minutes, strain, and drink warm. Adding fresh ginger and honey enhances the warming effect and flavor.
Can I eat perilla leaves raw?
Yes. Fresh perilla leaves are eaten raw in many Asian cuisines — wrapped around grilled meat, rolled into rice paper wraps, or torn into salads. Their flavor is fragrant, slightly minty, and basil-like.
Who should avoid perilla leaf?
People with yin deficiency or excess heat signs, heavy sweating, or who are constitutionally weak are traditionally advised to use perilla with caution. Pregnant women and those on medication should consult a qualified healthcare provider first.