Bo He (Mentha haplocalyx or Mentha arvensis) is the traditional Chinese form of peppermint, prized in TCM as a cool, pungent herb that clears heat, dispels wind, and moves stagnant liver qi. It has been a core herb in Chinese medicine for over a thousand years, appearing in the Shennong Bencao Jing and numerous classical formulas. Unlike Western peppermint use, which focuses mainly on digestion and flavoring, TCM deploys Bo He strategically to resolve early-stage fevers, soothe the throat, open the eyes and head, and ease emotional tension tied to liver constraint.

Bo He works primarily through its high menthol content, which activates TRPM8 cold receptors in the skin and mucous membranes — creating a cooling, soothing sensation that relieves throat irritation, opens nasal passages, and calms surface inflammation. Its antispasmodic action relaxes smooth muscle in the digestive tract, easing bloating and cramping. From a TCM perspective, it disperses wind-heat in the upper body and spreads liver qi — which maps onto its modern recognized role in reducing tension, relieving headaches, and easing stress-related digestive symptoms.

As a tea or decoction, Bo He is added at the end of cooking (last 5 minutes) to preserve volatile oils — this is the classic TCM method. Enteric-coated peppermint oil capsules are the most clinically studied form for IBS and gut symptoms, protecting active compounds from breaking down in the stomach. Tinctures offer convenient liquid dosing. Topical gels and creams deliver menthol directly for headache and muscle tension relief. TCM granule extracts are a modern convenience form of the traditional decoction.

• Sore throat and early cold or flu
• Bloating, gas, and IBS
• Headache and migraines
• Sinus congestion and allergies
• Stress, irritability, and tension
• Nausea and indigestion
• Skin itching and minor inflammation
• Fatigue and mental fog
• Menstrual cramps and PMS irritability
• Eye redness and heat (TCM use)

• Progression of early-stage cold symptoms when taken at first onset
• IBS flare-ups when used as a maintenance supplement (enteric-coated peppermint oil)

• Fresh peppermint leaves — The closest food-form equivalent — fresh mint leaves contain meaningful amounts of menthol, rosmarinic acid, and luteolin, and can be added to teas, salads, and dishes to gain mild therapeutic benefit.
• Peppermint tea (dried herb) — Steeping dried Bo He or peppermint in hot water for 5–10 minutes delivers the volatile oils and polyphenols in an easily absorbed, traditional form — this is effectively medicinal-dose use of the herb.
• Spearmint — A close botanical relative with similar (though milder) menthol content and antispasmodic polyphenols — a good dietary alternative that supports the same digestive and anti-inflammatory pathways.
• Lemon balm — A fellow mint-family herb with overlapping benefits for digestion, stress relief, and mild antimicrobial support — commonly combined with Bo He in herbal teas for compounded effect.
• Fennel — Supports the same digestive pathways as Bo He — its volatile oils (anethole) relax gut smooth muscle, ease bloating, and complement peppermint's carminative action in a diet focused on gut comfort.

• Heartburn or acid reflux (non-enteric-coated forms, especially in GERD-prone individuals)
• Skin irritation or burning sensation (topical use, especially on sensitive skin)
• Perianal burning (with high-dose oral peppermint oil, as it passes through the gut)
• Cold sensation that may feel uncomfortable in some individuals
• Allergic reaction (rare) — possible in people allergic to other mint-family plants
• Respiratory distress in infants if menthol applied near face — avoid in children under 2
• Headache or nausea with excessive inhalation of concentrated essential oil

• Recommended daily: Tea: 1–2 teaspoons (2–4g) dried Bo He steeped 5 minutes, 1–3 cups daily. Enteric-coated peppermint oil capsules (for IBS): 0.2–0.4 mL per capsule, 1–2 capsules three times daily before meals. Topical peppermint oil (headache): 10% menthol preparation applied to forehead and temples as needed. Tincture: 2–4 mL (1:5 in 45% alcohol), three times daily.
• Best time of day: Digestive use: 15–30 minutes before meals. Cold/flu support: any time, as needed. Mental clarity/fatigue: mid-morning or early afternoon. Avoid large doses of tea late at night as its stimulating aromatic quality may be activating for some people.
• With or without food: Enteric-coated capsules: take 30–60 minutes before meals for best IBS results. Tea can be taken with or between meals. Avoid taking strong peppermint tea immediately after large fatty meals if you are prone to reflux.
• Time to effect: Acute relief (throat, congestion, headache, nausea): 20–60 minutes. Digestive/IBS improvement: 2–4 weeks of consistent use. Stress and liver qi support: 4–8 weeks as part of a formula.
• How long to take it: Safe for continuous long-term use at tea doses. Enteric-coated capsule regimens for IBS are typically used for 4–12 weeks, then reassessed. In TCM formulas, Bo He is often cycled based on symptom patterns. No established need for breaks at food or tea doses.