Which Is The Best Solvent For Herbal Extraction?

Which Is The Best Solvent For Herbal Extraction? For bioactive compounds extraction or herbal formulation best solvents are aqueous and hydroalcohol (70 or 50 percent ethanol). Because in this solvents we can produce herbal products. And we can use or consume those products without fear of high toxicity. Which solvent is best for plant extraction?