Siwutang (四物汤) - "Four Substances Decoction" - one of the most fundamental and important blood-tonifying formulas in Traditional Chinese Medicine. This appears to be a modern commercial preparation in capsule form. Traditional Actions and Uses Primary Functions: - Nourishes blood (养血) - Regulates menstruation (调经) - Activates blood circulation (活血) - Harmonizes liver and spleen (调和肝脾)