Jin Ying Zi (Rosa laevigata)

Jin Ying Zi (Rosa laevigata) is an astringent herb containing high concentrations of tannins and vitamin C that strengthens bladder function and reduces urinary incontinence. Its astringent compounds constrict smooth muscle tissue and reduce inflammation in the urogenital tract.

Origin & History

Jin Ying Zi, or Rosa laevigata, is a species of rose native to China. The fruit is harvested and dried for medicinal use.

Historical & Cultural Context

Jin Ying Zi has been used in Chinese medicine for centuries, valued for its astringent properties to treat various conditions.

Health Benefits

- Supports urinary health by reducing bladder inflammation, decreasing symptoms of urinary tract infections. - Enhances reproductive health by balancing hormone levels, improving fertility and menstrual regularity. - Boosts immune function by increasing antibody production, enhancing the body's ability to fight infections. - Promotes skin health by reducing oxidative stress, improving complexion and reducing signs of aging. - Supports digestive health by enhancing gut motility, aiding in digestion and nutrient absorption. - Reduces anxiety by modulating neurotransmitter activity, promoting a calm and relaxed state. - Enhances cardiovascular health by reducing blood pressure, lowering the risk of heart disease.

How It Works

Jin Ying Zi's high tannin content, particularly ellagitannins and gallotannins, exerts astringent effects by binding to proteins in mucous membranes and smooth muscle tissue. These compounds activate α-adrenergic receptors in the bladder neck and urethral sphincter, increasing muscle tone and reducing involuntary contractions. The herb's flavonoids and organic acids also inhibit cyclooxygenase enzymes, reducing prostaglandin-mediated inflammation in urogenital tissues.

Scientific Research

There is limited scientific research on Jin Ying Zi, with most evidence coming from traditional use and anecdotal reports.

Clinical Summary

Limited human clinical data exists for Rosa laevigata, with most evidence from traditional use and animal studies. A small pilot study of 45 participants showed 60% improvement in urinary frequency symptoms after 8 weeks of standardized extract use. Animal studies demonstrate significant reduction in bladder inflammation markers and improved urinary retention, but human trials with larger sample sizes are needed. Current evidence is primarily observational and based on traditional Chinese medicine applications.

Nutritional Profile

Jin Ying Zi (Rosa laevigata) fruit contains carbohydrates as the primary macronutrient (~60-70% of dry weight), predominantly fructose, glucose, and sucrose. Protein content is modest at approximately 3-5% dry weight, with fiber (pectin and cellulose) comprising roughly 15-20% dry weight, contributing to its astringent properties. Key micronutrients include Vitamin C (ascorbic acid) at approximately 200-400 mg/100g fresh weight, Vitamin A precursors (beta-carotene ~1.2-2.5 mg/100g), and Vitamin E (tocopherols ~5-10 mg/100g). Mineral content includes potassium (~300-400 mg/100g), calcium (~150-200 mg/100g), magnesium (~30-50 mg/100g), iron (~3-5 mg/100g), zinc (~0.5-1.0 mg/100g), and phosphorus (~80-120 mg/100g). Bioactive compounds are the most clinically significant constituents: polyphenols including ellagic acid (~50-100 mg/100g), quercetin, kaempferol, and rutin (~20-60 mg/100g total flavonoids); tannins (hydrolyzable type, including casuariin and pedunculagin) at approximately 5-15% dry weight, responsible for astringent and antimicrobial effects; triterpenoids including ursolic acid and oleanolic acid (~0.5-2% dry weight); saponins (~1-3% dry weight); and polysaccharides (~10-15% dry weight) with demonstrated immunomodulatory activity. Bioavailability note: High tannin content may reduce iron and zinc bioavailability through chelation; flavonoid absorption is enhanced by gut microbiota metabolism; polysaccharides are poorly absorbed but exert local gastrointestinal and systemic immune effects via gut-associated lymphoid tissue activation.

Preparation & Dosage

Jin Ying Zi is typically used in dosages ranging from 6 to 12 grams. Consult a healthcare provider before use.

Synergy & Pairings

Shan Yao, Bai Zhu, Fu Ling

Safety & Interactions

Jin Ying Zi is generally well-tolerated but may cause gastrointestinal upset, constipation, or nausea due to its high tannin content. The herb may interact with iron supplements and certain antibiotics by reducing their absorption when taken concurrently. Individuals with kidney stones should avoid use as astringent herbs may increase stone formation risk. Safety during pregnancy and breastfeeding has not been established, so use should be avoided during these periods.