top of page


  • Spasms and cramps:

    • Skeletal muscles in the extremities

    • Smooth muscles in the internal organs

  • Muscle tightness and stiffness due to repetitive movements

  • External injuries with muscle sprain and strain



  • Muscle-relaxant effect to treat muscle spasms and cramps

  • Anti-inflammatory function to reduce inflammation and swelling

  • Analgesic effect to relieve pain



  • Tonifies Liver yin and Liver blood

  • Relieves spasms and cramps

  • Tonifies the blood

  • Warms the meridians and unblocks stagnation

  • Invigorates blood circulation



Take 3 to 4 capsules every four to six hours as needed for muscle spasms and cramps. The dosage may be increased up to 5 to 6 capsules every two to four hours if necessary. For maximum effectiveness, take Flex (SC) on an empty stomach with a tall glass of warm water.




Bai Shao (Radix Paeoniae Alba)

Dang Gui Wei (Extremitas Radix Angelicae Sinensis)

Hua Jiao (Pericarpium Zanthoxyli)

Zhi Gan Cao (Radix et Rhizoma Glycyrrhizae Praeparata cum Melle)



  • This formula should not be taken long-term in patients who have hypertension, as prolonged use of Zhi Gan Cao (Radix et Rhizoma Glycyrrhizae Praeparata cum Melle) may be associated with water retention.

  • This herbal formula contains herbs that invigorate blood circulation, such as Dang Gui Wei (Extremitas Radix Angelicae Sinensis). Therefore, patients who are on anticoagulant or antiplatelet therapies, such as Coumadin (warfarin), should use this formula with caution, or not at all, as there may be a higher risk of bleeding and bruising

Flex (SC)


    Related Products