Mi Meng Hua also known as Flos Buddlejae is the flower bud and inflorescence of Buddleja Officinalis, which is a deciduous shrub belonging to the family Loganiaceae. It first appeared in <Lei Gong Pao Zhi Lun> (Master Lei’s Discourse on Processing of Chinese Materia Medica) in the Northern and Southern Dynasties (420 AD–589 AD).
Buddleja Officinalis is an ornamental plant that often grows in the shrubs on sunny slopes, rivers, or villages at 200-2,800 meters above sea level. It is distributed in China, Bhutan, Myanmar, and Vietnam. Its flowers can extract aromatic oils and can be made into yellow food dyes.
Every spring, before the Buddleja Officinalis blooms, people gather their flower buds and inflorescences, remove their impurities, dry them in the sun, and make them into Chinese herbs.
Mi Meng Hua contains acacetin, luteolin, apigenin, acaciin, linarin, luteolin－7－O－glucoside, luteolin－7－O－α－rutinoside, cosmosiin, apigenin－7－O－rutinoside, Phenylethanolic glycosides, triterpenoids, saponin, α-spinasterol, galactitol, vanillic, D-mannitol, etc. The grayish yellow Mi Meng Hua with short down is the best.
According to <Kaibao Bencao>, the medicinal property of Mi Meng Hua is slightly cold, with a sweet taste. It has a certain therapeutic effect on the pathological changes of the liver and gallbladder meridians.
In Chinese medicine, Mi Meng Hua is often used for clear heat and reduce fire, improve vision, and treat dry eye, cataracts, corneal softening, and photophobia. It is an important component of Huanglian Yanggan Wan and Boyun Tuo Yi Wan.
Health benefits of Mi Meng Hua
- Anti-inflammation, anti-virus, anti-oxidation, anti-tumor.
- Inducing diuresis and having a mild choleretic effect.
- Improving T lymphocyte activity and enhancing immunity.
- Inhibiting lipid accumulation and adipocyte differentiation.
- Inhibiting the activity of aldose reductase, lowering blood sugar and improving the abnormality of the polyol metabolism pathway in diabetic patients.
- Delaying diabetic complications such as retinopathy and cataract.
- Relieving redness and swelling of the eyes and photophobia caused by the up-flaming of liver fire.
- Reducing liver fire and eliminating nebulae caused by the stagnation of liver-fire.
- Clearing liver heat, nourishing liver, alleviating blurred vision and dry eyes caused by hepatic asthenia.
- It contains acacetin, which has a vitamin P-like effect, can reduce vascular permeability, improve vascular fragility, and relieve isolated intestinal spasm caused by histamine and acetylcholine.
- The study found that its aqueous extract could inhibit Staphylococcus aureus and beta-hemolytic streptococcus.
Mi Meng Hua is used with other Chinese herbs
- It with Chan Tui (Periostracum Cicadae) and Bai Ji Li (Fructus Tribuli) can eliminate nebulae.
- It with Ju Hua (Flos Chrysanthemi) and Gan Cao (Licorice Root) can alleviate redness and swelling of the eyes and photophobia caused by the up-flaming of liver fire.
- It with Tu Si Zi (Semen Cuscutae), Shan Yao (Rhizoma Dioscoreae), and Rou Cong Rong (Cistanche) can treat blurred vision and dry eyes.
Side effects of Mi Meng Hua
Mi Meng Hua is slightly toxic and should be used with caution. Excessive use of it may cause dizziness, vomiting, indigestion, or numbness and tremors in the limbs.
Precautions of Mi Meng Hua
- The dosage of Mi Meng Hua should be controlled between 9-15g.
- It can be made into decoction or pills.
- It should not be used to treat eye diseases caused by wind-heat.
- Pregnant women and children should not take it.