Milk thistle is the most popular herbal supplement used for liver health, but the medical community emphasizes that the term "liver detox" is a bit of a misnomer. Your liver does not require external cleanses to clear toxins. It acts as its own continuous self-cleaning system.Instead of acting as a quick "flush" after heavy drinking or poor diet, milk thistle functions as a long-term supportive tool to protect liver cells from ongoing inflammation and stress.