St. John's wort (Hypericum perforatum)--is it safe during breastfeeding?

Area of Science:

• Pharmacology
• Neonatal studies
• Herbal medicine

Background:

• St. John's wort is a popular natural remedy for depression, often used by mothers postpartum.
• There is limited data on the safety and pharmacokinetics of St. John's wort in breast milk and infants.

Observation:

• A mother with postnatal depression took St. John's wort (Jarsin 300) three times daily.
• Breast milk samples were analyzed for hypericin and hyperforin over 18 hours.
• Infant plasma was also analyzed for these compounds.

Findings:

• Hyperforin was excreted into breast milk at low levels.
• Hypericin and hyperforin were below the limit of quantification in infant plasma.
• Neither the mother nor the infant experienced any adverse side effects.

Implications:

• While initial findings suggest low infant exposure, long-term studies are crucial before recommending St. John's wort for breastfeeding mothers.
• Further research is needed to establish the safety profile for infants exposed to St. John's wort via breast milk.
• This study highlights the need for systematic safety evaluations of commonly used herbal supplements in lactation.