Vietnamese scientists found a better way to extract lentinan (the healthy compound) from shiitake mushrooms. While the new ultrasound method pulled out 63% more of the good stuff and cut extraction time from 3 hours to just 6 minutes, some hurdles remain. Temperature control is tricky - even though 65°C (150°F) worked best, researchers noted "heat really matters" and the equipment costs might make it tough for small-scale producers to adopt.