Solaray Continence Max with FlowtrolHow it works: Butterbur root extract (150 mg, 15% sesquiterpenes): acts as a smooth muscle relaxant, potentially easing bladder spasms. Certified low in pyrrolizidine alkaloids for safety. St. John's Wort aerial extract (300 mg, 0. 3% hypericin): traditionally believed to support bladder muscle tone and function. GABA (25 mg): a neurotransmitter researched for bladder urge modulation and reducing urinary frequency. Flowtrol Herbal Control Blend (1,080