evidence: Milk thistle may be useful in treating liver disease, cancer, and diabetes. But the evidence is limited, and some research methodologies are flawed, so it’s difficult to confirm these effects. [...] Milk thistle has been used as a traditional remedy for neurological conditions like Alzheimer’s and Parkinson’s disease for over two thousand years. [...] These studies have also seen that milk thistle may be able to reduce the number of amyloid plaques in the brains of animals with Alzheimer’s disease.