Rosa gallica

Rosa gallica, the Gallic rose, contains bioactive polyphenols including gallic acid, quercetin, and kaempferol that drive its therapeutic effects. These compounds modulate matrix metalloproteinase activity, stimulate hyaluronic acid synthesis, and exert antioxidant effects across skin and cellular health applications.

Origin & History

Rosa gallica is a species of rose native to Europe and western Asia, commonly known as French rose or Gallic rose, primarily sourced from its petals. The plant extract (RPE) is typically obtained through water-soluble or hydroalcoholic extraction methods from dried petals, yielding polyphenolic-rich fractions containing phenolic acids, flavonoids, and anthocyanins.

Historical & Cultural Context

Rosa gallica petals have historical use in traditional European and Persian medicine as 'Gul Gulaab' for skin conditions and stress relief, often prepared as a hydrosol. Modern extracts build on this traditional use for anti-aging nutraceutical applications.

Health Benefits

• Improves skin hydration by increasing hyaluronic acid levels (human clinical trial evidence)
• Prevents UV-induced skin aging and wrinkles by inhibiting MMP-1 expression (animal study evidence)
• Shows anti-proliferative effects against lung and colon cancer cells (in vitro evidence only)
• Protects against collagen loss through c-Raf/MEK pathway inhibition (preclinical evidence)
• Enhances skin barrier function via GLK-MAP2K-MAPK signaling (preliminary human evidence)

How It Works

Rosa gallica's polyphenols, particularly gallic acid and quercetin, inhibit matrix metalloproteinase-1 (MMP-1), the collagen-degrading enzyme upregulated by UV radiation, thereby reducing photoaging-related wrinkle formation. Kaempferol and quercetin upregulate hyaluronic acid synthase (HAS) gene expression in dermal fibroblasts, increasing extracellular hyaluronic acid deposition and improving skin moisture retention. Additionally, the ellagitannins and flavonoids in Rosa gallica scavenge reactive oxygen species (ROS) and modulate NF-κB signaling, contributing to anti-inflammatory and potential anti-proliferative activity in cancer cell lines.

Scientific Research

Limited human clinical evidence exists, with one double-blinded trial (PMID: 36573713) demonstrating RPE's effects on skin hydration through increased HAS2 and hyaluronic acid levels in keratinocytes. Most research remains at the preclinical level, including mouse studies on UV protection and in vitro cancer cell studies, with no RCTs or meta-analyses identified for other health indications.

Clinical Summary

A human clinical trial demonstrated that Rosa gallica extract significantly increased skin hyaluronic acid levels and improved hydration metrics in participants following topical or oral administration, though exact sample sizes from available data are limited. Animal studies in UV-exposed models confirmed suppression of MMP-1 expression and a measurable reduction in wrinkle depth and skin roughness scores. In vitro studies show dose-dependent anti-proliferative effects against A549 lung cancer cells and HT-29 colon cancer cells, with IC50 values reported in the low-to-mid microgram-per-milliliter range, but these findings have not been replicated in human trials. Overall, evidence for skin benefits is the strongest, while cancer-related claims remain preliminary and require clinical validation.

Nutritional Profile

Rosa gallica (Gallic Rose) petals and hips contain a diverse array of bioactive compounds. Polyphenols are the dominant class, with total phenolic content ranging from 15–45 mg GAE/g dry weight depending on plant part. Key flavonoids include quercetin (0.5–2.1 mg/g dry weight), kaempferol (0.3–1.4 mg/g dry weight), and anthocyanins such as cyanidin-3,5-diglucoside and pelargonidin derivatives (collectively 1.5–8 mg/g in petals). Gallic acid and ellagic acid are prominent hydrolyzable tannins (0.8–3.2 mg/g dry weight). Rose hips are notably rich in Vitamin C (ascorbic acid), with concentrations of 200–400 mg/100g fresh weight, though this degrades significantly with heat processing. Carotenoids including beta-carotene and lycopene are present at 0.5–2 mg/100g. Tocopherols (Vitamin E) are found at approximately 25–50 mg/100g in hip seed oil. Essential fatty acids in seed oil include linoleic acid (omega-6, ~44%) and alpha-linolenic acid (omega-3, ~33%), with notable trans-retinoic acid (~0.01–0.04%). Terpene alcohols such as geraniol, citronellol, and nerol are present in essential oil fractions (30–75% of volatile fraction). Fiber content in dried hips reaches 24–30g/100g, predominantly pectin and cellulose. Protein content is modest at 1.6–3.5g/100g dry weight. Mineral content includes potassium (~430 mg/100g), calcium (~169 mg/100g), magnesium (~69 mg/100g), and iron (~1.1 mg/100g). Bioavailability note: polyphenol absorption is limited (typically 5–10% of ingested dose) due to intestinal metabolism; topical application bypasses this limitation, which is relevant to the observed skin-related clinical benefits. Vitamin C is highly bioavailable when consumed fresh but degrades rapidly upon oxidation or thermal processing.

Preparation & Dosage

Human clinical dosages are not clearly specified in available research. Preclinical studies used 50-1,000 μg/mL for in vitro applications and oral administration in mice without specified mg/kg doses. No standardized extract dosages have been established for human use. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Hyaluronic acid, Vitamin C, Collagen peptides, Green tea extract, Resveratrol

Safety & Interactions

Rosa gallica is generally well-tolerated when used as directed, with the European Medicines Agency (EMA) recognizing its traditional use, primarily for mild skin inflammation and supportive gastrointestinal applications. High-dose supplementation may cause mild gastrointestinal discomfort due to its tannin content, including ellagitannins, which can have astringent effects on the gut mucosa. Rosa gallica's polyphenols may theoretically interact with anticoagulant drugs such as warfarin by inhibiting platelet aggregation, and caution is advised when combining it with iron supplements, as tannins can chelate non-heme iron and reduce absorption. Safety data during pregnancy and lactation is insufficient, and use during these periods should be avoided unless supervised by a healthcare provider.