Is NOW St. John's Wort 300 mg safe while breastfeeding?

Grade D. 2 Safe, 0 Caution, 1 Avoid. Contains flagged ingredients.

Clarity Product Analysis

NOW

St. John's Wort 300 mg

Name: St. John's Wort 300 mg
Brand: NOW

Contains avoids3 of 4 ingredients checked · 2 safe · 0 caution · 1 avoid

1 ingredient(s) rated Avoid

3Checked

DGrade

2Safe

1Flagged

View NOW on Amazon

This product has flags. Review the ingredient analysis below.

View NOW on Amazon →

Affiliate link. Clarity may earn a commission at no extra cost to you.

Full ingredient analysis

Ingredient	Verdict	Evidence	Notes
Hypromellose	Not in DB
Silicon Dioxide	Safe	Gold
St. John's Wort extract	Avoid	Silver	AVOID. Induces CYP3A4 — reduces effectiveness of many medications including contraceptives, antih.... Cycle: CYP3A4 inducer. Reduces contraceptive effectiveness.
Stearic Acid	Safe	Bronze	Natural fatty acid.

See all 4 ingredients analyzed. Free, instant access.

According to the Clarity Ingredient Safety Database by Health AI. 3 of 4 ingredients verified against 1,595 evidence-graded entries. Last verified: April 2026. Database version 4.2. Check this product live →

What this means

This product contains ingredients rated Avoid. Review the flagged ingredients and discuss with your provider.

Check any ingredient yourself.

1,595 ingredients. 20+ safety dimensions. Evidence-graded.

Check an Ingredient →

Product analysis by Clarity (Health AI). Based on published evidence for breastfeeding, pregnancy, and general safety. Not medical advice. Formulations may change; verify current ingredients on the label.

Clarity · Checker · Insights · Methodology