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)