Raspberry Leaf Tea in Pregnancy: Evidence, Safety & Guidelines

Red raspberry leaf (Rubus idaeus) tea is a traditional uterine tonic. Evidence is limited but suggests possible benefits for labor outcomes.

Proposed Active Compounds

• Fragarine: Alkaloid; relaxes/tones uterine muscle (dose-dependent biphasic effect in vitro).
• Tannins (ellagitannins): Astringent, anti-inflammatory.
• Flavonoids, vitamin C, minerals: Antioxidant, nutritive.

Clinical Evidence

• Observational studies: Association with shorter second stage, lower instrumental delivery, fewer pre-/post-term births.
• RCTs (few, small): Simpson et al. (2001) – 2.4 g/day from 32 wks: no harm; trend to shorter labor, less forceps. No powered RCT confirms benefit.
• Cochrane review: Insufficient evidence to recommend for/against.

Safety Profile

• Generally recognized as safe (GRAS) in food amounts.
• No teratogenicity in animal models.
• Theoretical concern: uterine stimulation → preterm labor if used <32 wks. Start at 32 weeks.
• Contraindicated: prior C-section (uterine scar), placenta previa, bleeding, multiple gestation, hypertension.

Practical Guidelines

• Dose: 1–2 cups/day (1 tsp dried leaf/cup, steep 10–15 min) or equivalent tablets.
• Start: 32 weeks gestation.
• Stop: If contractions become regular/painful before 37 wks; if any vaginal bleeding.
• Discuss with OB/midwife before starting—especially if high-risk.

Not a substitute for evidence-based labor preparation (positioning, mobility, support). May be a harmless ritual with possible upside.