Herbal formulas

Herbs that work together

Many of the best-studied herbal products are combinations. Each page explains what is in the blend, what trials of the combination itself have found, and who should avoid it.

How to read the ratings

  • Good clinical evidence
  • Promising clinical evidence
  • Early or mixed evidence
  • Long traditional use

Ratings reflect trials of the combination for its main use, not the evidence for each ingredient on its own.

These pages are educational and are not medical advice. Looking for a single plant? Browse the herb library →