What is medicinal Bo He? Is it the same as spearmint or peppermint?
Official Bo He (薄荷) is the dried aerial part of Mentha haplocalyx Briq. The pharmacopoeial name is Menthae Haplocalycis Herba. Spearmint (liu lan xiang) is a different Mentha species whose oil is dominated by carvone and contains little menthol; it is slightly warm and not an equivalent. European peppermint (M. piperita) is also not the pharmacopoeial source. Kitchen “mint” is not automatically the same as the decoction slice.
What are the TCM properties and traditional uses of Bo He?
According to the Chinese Pharmacopoeia, Bo He is acrid and cool, enters the Lung and Liver channels, and acts to disperse Wind-Heat, clear the head and eyes, benefit the throat, vent rashes, and spread Liver Qi. It is used for Wind-Heat colds, early warm-pathogen onset, headache, red eyes, sore throat, mouth sores, wind-rash, measles and chest-flank oppression. Acrid to disperse, cool to clear, it is the lightest upward-moving cool exterior-releaser, and it also enters the Liver to ease constraint.
Why is Bo He added at the end of the decoction? Can it be boiled for a long time?
Add it late; do not boil it for long. The active fraction is a volatile oil (menthol, menthone). Prolonged boiling drives it off and weakens the exterior-releasing, head-clearing effect. Drop it in for the last 3–5 minutes. Cover mint tea; do not simmer it uncovered. Menthol crystals and mint oil are separate preparations—not a homemade “concentrated Bo He” to swallow.
What is the usual dosage of Bo He?
The pharmacopoeial internal dose is 3–6 g in decoction, added late; externally, a decoction may be used as a gargle or wash. Reduce the dose for children. Short steeped tea is common. Large doses can oversweat and damage fluids. Menthol as a preparation is usually 0.02–0.1 g in lozenges—not the same as the herb. Do not put mint essential oil near an infant’s face.
What are the cautions? Can it be used in pregnancy or while breastfeeding?
Use caution in exterior deficiency with spontaneous sweating, Yin-deficiency dryness, and frail people who already sweat easily. Too much acrid dispersal consumes Qi and Yin. Cold digestion and reflux may worsen with large culinary amounts. Tradition holds that it may reduce lactation. Avoid large or prolonged volatile-oil use in pregnancy; short herbal courses need a clinician. Stop if allergy or contact dermatitis appears.
Is Bo He both food and medicine? Can it be drunk as tea every day?
It is a familiar dual-use aromatic and may enter tea, salads and sweets in small amounts. It suits brief clearing of Wind-Heat, a heavy head and a scratchy throat—not a four-season wellness tea. Daily strong mint tea in Yang deficiency, spontaneous sweating, night sweating or deficient restlessness can disperse and dry further. Essential oil and menthol are medicines, not beverage add-ins.
Can Bo He be used for a Wind-Cold cold?
It targets Wind-Heat: fever, mild aversion to wind, headache, red throat, red eyes and a thin yellow coat. Wind-Cold (strong chills, clear runny nose, no sweat, white coat) needs warm exterior-releasers; mint alone is the wrong pattern. In Yin Qiao San it is added late. High fever, breathing difficulty or febrile seizures in children need medical care, not mint tea alone.
Can Bo He spread the Liver, vent rashes and benefit the throat?
Yes. Entering the Liver it spreads constrained Qi for chest-flank fullness; Xiao Yao San uses a small amount. It vents early wind-rash or measles when the eruption is stuck. For sore throat and mouth sores it pairs with Platycodon, licorice and honeysuckle. Liver-spreading uses a light dose—it is not a high-dose Bupleurum substitute. Unexplained rash or measles complications need medical care.
Which herbs is Bo He combined with? What are the representative formulas?
For Wind-Heat it joins honeysuckle, forsythia, Schizonepeta and Arctium in Yin Qiao San. For constrained Liver with weak Spleen it joins Bupleurum, Angelica and white peony in Xiao Yao San (keep the mint small). For the throat it joins Platycodon, licorice and Scrophularia; for the head and eyes, mulberry leaf and chrysanthemum. Always add it late and do not self-escalate it as a “cooling tonic.”
How do you choose and store Bo He? How do you avoid spearmint substitutes?
Choose lots that are leafy, green, strongly aromatic, pungent-cool when crushed, with few old stems. Taicang in Jiangsu is a traditional production area. Genuine oil is menthol-rich; spearmint smells sweeter and less cooling. Store sealed in a cool, dry place so the aroma does not flee. Discard yellowed, moldy or scentless herb. Keep essential oil and menthol as separate preparations—do not mix them with the slices.
