Bitter herbs like dandelion, gentian, and wormwood have been studied for their digestive and liver-supporting effects.

For instance, dandelion has been researched for its potential to support liver function, with studies suggesting it may help increase bile flow and reduce liver inflammation.

Gentian is well known in herbal medicine and has been shown in studies to stimulate digestive enzymes, which can improve digestion and appetite.

Wormwood has been studied for its antimicrobial properties, particularly its effectiveness against parasites, and it's also known to aid in digestion.

However, while traditional uses and some scientific studies support these effects, more large-scale clinical trials are often needed to fully confirm and understand the extent of their benefits.