136 Red Raspberry

Names

Common name – Red Raspberry

Scientific name – Rubus idaeus R. strigosus

Other names – s7aýtskw

Fig 57.1: Red Raspberry (Rubus idaeus) in its natural habitat.

Fig 57.2: Close-up of Red Raspberry leaves and branches.

Fig 57.3: Ripe red raspberry fruits ready for harvest.

Fig 57.4: Chemical structure of Sanguiin H-6, a major ellagitannin in Red Raspberry.

Fig 57.5: Chemical structure of Ellagic Acid, an ellagitannin metabolite.

Fig 57.6: Chemical structure of Quercetin-3-glucoside, a major flavonoid in Red Raspberry.

General Information

Red Raspberry (Rubus idaeus) is a perennial deciduous shrub in the rose family (Rosaceae) native to Europe and northern Asia, though it has been naturalized throughout North America. This woody-stemmed plant grows 3-6 feet tall (1-2 meters) with biennial canes that are typically thorny or prickly, though thornless varieties exist. The compound leaves consist of 3-7 pinnately arranged leaflets with serrated edges, green on top and whitish underneath due to fine hairs. The plant produces white to pale pink five-petaled flowers in spring, followed by the familiar aggregate fruit composed of numerous small drupelets that ripen to bright red in summer. Native to temperate regions, red raspberry thrives in woodland edges, clearings, and disturbed areas with moist, well-drained soil. ^[13] For thousands of years, Indigenous peoples across North America, along with European and Asian cultures, have recognized red raspberry as one of the most important medicinal plants, particularly valuing the leaves for women’s reproductive health and the fruit for nutrition and medicine. ^[3]

Traditional Indigenous Uses

The leaves, gathered and dried at the right time, are the most important part of this medicine. When made into a tea, they help prepare a woman’s body for childbirth, strengthening the womb and easing labor when the time comes. During birth, a stronger brew could help the muscles work together, and afterward, the same tea was used to help the womb recover and to prevent bleeding. ^[3]

Women would continue to drink raspberry leaf tea regularly to maintain balance in their moon cycles, calming cramps and easing heavy flow. This same tea, when taken or used as a wash, could help with diarrhea, mouth sores, or sore throats, for its astringent nature helped to tighten and heal. It was even used to stop bleeding or soothe wounds when applied to the skin. ^[3]

The tea also brought comfort during sickness, helping to bring down fevers and settle the stomach. Some would drink it daily as a tonic to keep the body strong and the digestion steady. The roots, when crushed into a poultice or wash, were used to clean and heal wounds, drawing out infection. ^[3]

The berries themselves were eaten fresh or dried, serving as both food and medicine. They nourished the body, providing strength and vitamins through the long seasons. ^[3]

Biochemical Compounds and Their Medicinal Properties

1. Ellagitannins (Primary Bioactive Compounds) ^[4]

Three Most Important Compounds:

(i) Sanguiin H-6 (C₈₂H₅₄O₅₂) – Major ellagitannin (up to 3.5% dry weight) ^[4]

(Complex oligomeric ellagitannin structure)

Multiple galloyl and HHDP units attached to glucose core

(ii) Lambertianin C (C₁₂₃H₇₈O₇₈) – Trimeric ellagitannin ^[4]

(Three sanguiin H-6 units linked together)

Extremely large polyphenolic structure

(iii) Ellagic Acid (C₁₄H₆O₈) – Ellagitannin metabolite ^[8]

Medicinal Properties:

• Uterotonic: Tones and strengthens uterine smooth muscle ^[7]
• Astringent: Strong protein-binding and tissue-contracting effects ^[9]
• Antimicrobial: Broad-spectrum antibacterial and antiviral activity ^[8]
• Antioxidant: Powerful free radical scavenging activity ^[4]

2. Flavonoids (Supporting Compounds) ^[4]

Three Most Important Compounds:

(i) Quercetin-3-glucoside (C₂₁H₂₀O₁₂) – Major flavonoid

(ii) Kaempferol-3-glucoside (C₂₁H₂₀O₁₁) – Flavonoid glycoside

(iii) Tiliroside (C₃₀H₂₆O₁₃) – Acylated flavonoid

3. Alkaloid Fragarine ^[7]

Most Important Compound:

Fragarine (Structure not fully characterized) – Uterine alkaloid

(Proposed structure – phenolic alkaloid)

Specific structure remains partially undefined

Associated with uterine muscle effects

Proposed Biochemical Mechanisms for Traditional Uses

Uterine Toning and Pregnancy Support (Leaf Tea) ^[1]

1. Fragarine alkaloid acts through:
   • Regulation of uterine smooth muscle tone
   • Modulation of calcium channels in uterine tissue
   • Coordination of myometrial contractions
2. Ellagitannins contribute:
   • Astringent effects strengthening uterine tissue
   • Anti-inflammatory properties reducing uterine inflammation
   • Antioxidant protection of reproductive tissues

Labor Facilitation and Postpartum Recovery ^[7]

1. Fragarine + ellagitannins facilitate:
   • Enhanced uterine muscle fiber organization
   • Improved blood flow to reproductive organs
   • Reduced postpartum hemorrhage through vasoconstriction
2. Flavonoids provide:
   • Antioxidant protection during delivery stress
   • Anti-inflammatory effects reducing tissue trauma
   • Enhanced tissue repair mechanisms

Astringent and Antidiarrheal Effects (Leaf Preparations) ^[9]

1. Ellagitannins act as:
   • Protein precipitating agents causing tissue contraction
   • Reduction of intestinal secretions
   • Antimicrobial compounds against gut pathogens
2. Tannins provide:
   • Protective coating of intestinal mucosa
   • Reduced capillary permeability in gut
   • Hemostatic effects controlling bleeding

Chemical Reactions and Molecular Interactions

Uterotonic Mechanism (Fragarine + Tannins) ^[7]

Fragarine → Uterine smooth muscle calcium modulation → Enhanced contractility → Organized contractions → Improved labor efficiency

Ellagitannins → Uterine tissue strengthening → ↑ Muscle tone → Enhanced postpartum recovery → Reduced hemorrhage

Astringent Action (Ellagitannins) ^[9]

Sanguiin H-6 → Protein cross-linking → Tissue contraction → Reduced capillary permeability → Decreased bleeding

Ellagitannins + Mucosa proteins → Protective barrier formation → Reduced inflammation → Healing promotion

Anti-inflammatory Mechanism (Flavonoids + Ellagic Acid) ^[4]

Quercetin → NF-κB pathway inhibition → ↓ Pro-inflammatory cytokines → Reduced tissue inflammation → Pain relief

Ellagic acid → COX-2 enzyme inhibition → ↓ Prostaglandin synthesis → Anti-inflammatory and analgesic effects

Antimicrobial Activity (Ellagitannins) ^[8]

Ellagitannins → Bacterial membrane disruption → Cell lysis → Increased permeability → ATP leakage → Cell death

Ellagic acid → Viral protein binding → Inhibited replication → Reduced viral load → Enhanced recovery

Antioxidant Protection (Multiple Compounds) ^[4]

Ellagitannins + Flavonoids → ROS scavenging → ↓ Oxidative stress → Cellular protection → Enhanced tissue health

Ellagic acid + Fe³⁺ → Metal chelation → Prevented Fenton reactions → Reduced lipid peroxidation → Membrane protection

Traditional Preparation Methods and Biochemical Optimization

Leaf Tea (Primary Traditional Method) ^[2]

1. Hot water infusion: Extracts ellagitannins, flavonoids, and fragarine
2. Extended steeping: 10-15 minutes optimizes tannin extraction
3. Daily consumption: Third trimester use for pregnancy preparation
4. Fresh or dried leaves: Both effective with slightly different profiles

Dosage Protocols ^[11]

Traditional midwife recommendations:

• First trimester: Generally avoided due to potential uterine stimulation
• Second trimester: Occasional use begins
• Third trimester: Daily consumption (1-3 cups) for labor preparation
• During labor: Strong decoction for active support
• Postpartum: Continued use for 4-6 weeks for recovery

Nutritional Value

Red raspberry fruit provides essential nutrients: ^[5]

• Vitamin C: 26 mg per 100g supporting immune function ^[12]
• Manganese: Important for bone health and metabolism ^[12]
• Fiber: Supporting digestive health ^[12]
• Antioxidants: Ellagic acid and anthocyanins ^[8]

Safety Considerations and Traditional Wisdom

Traditional Guidelines ^[10]

Indigenous and traditional preparation emphasizes: ^[3]

• Timing in pregnancy: Third trimester focus for safety
• Appropriate dosing: Moderate, consistent use
• Quality assessment: Fresh, properly dried leaves
• Individual response: Monitoring for personal tolerance

References

1. Bowman, R. L., Taylor, J., & Davis, D. L. (2024). Raspberry leaf (Rubus idaeus) use in pregnancy: A prospective observational study. BMC Complementary Medicine and Therapies, 24 (1), 4465. https://doi.org/10.1186/s12906-024-04465-7
2. Colorado School of Clinical Herbalism. (2025). Red raspberry leaf. https://clinicalherbalism.com/red-raspberry-leaf/
3. Elders and Community members of the Cayoose Creek Band of Sekw’el’was. (n.d.).
4. Kula, M., Majdan, M., & Olszewska, M. A. (2015). Chemical composition and biological activity of Rubus idaeus. Industrial Crops and Products, 69, 18–29. https://doi.org/10.1016/j.indcrop.2015.01.045
5. Medical News Today. (2021). Red raspberry leaf tea: Nutrition, benefits, and how to use. https://www.medicalnewstoday.com/articles/red-raspberry-leaf-tea
6. Medscape. (2025). Red raspberry, Rubus idaeus, Rubus strigosus (raspberry leaf). https://reference.medscape.com/drug/red-raspberry-rubus-idaeus-raspberry-leaf-344515
7. Parry, B. L., & Morgan, L. D. (2021). Biophysical effects, safety, and efficacy of raspberry leaf use in pregnancy. Phytotherapy Research, 35 (4), 1961–1974. https://doi.org/10.1186/s12906-021-03230-4
8. Petkova, N., & Ivanova, D. (2024). The genus Rubus: An insight into phytochemicals and pharmacological studies. Pharmacia, 71 (2), 124248. https://doi.org/10.3897/pharmacia.71.e124248
9. Sadowska, B., Nowak, M., & Król, W. (2023). Raspberry leaves and extracts—Molecular mechanism of action. Frontiers in Pharmacology, 14, 10383074. https://doi.org/10.3390/nu15143206
10. ScienceDirect. (2025). Red raspberry leaf – An overview. https://www.sciencedirect.com/topics/medicine-and-dentistry/red-raspberry-leaf
11. Traditional Medicinals. (2025). Raspberry leaf – Benefits, folklore, botany, and more. https://www.traditionalmedicinals.com/blogs/herb-library/raspberry-leaf
12. U.S. Department of Agriculture. (2019). Raspberries, raw. FoodData Central. https://fdc.nal.usda.gov/fdc-app.html#/food-details/167755/nutrients
13. Wikipedia contributors. (2024). Red raspberry leaf. In Wikipedia, The Free Encyclopedia. https://en.wikipedia.org/wiki/Red_raspberry_leaf https://doi.org/10.1079/cabicompendium.48111