Drainage basin: The area drained by a river and its tributaries. A drainage basin is considered to be an open system because water can be added or lost from a drainage basin. Source: The beginning of a river. A river may have multiple sources.
Milk thistle (Silybum marianum) is a thorny plant presenting decorative leaves with a white pattern of veins and purple flower heads. The plant originates from mountains of the Mediterranean region, where it forms scrub on a rocky base.
Milk thistle extract is used to maintain liver health and to protect the liver from the effects of toxins such as alcohol, a polluted environment or workplace, and a host of liver related diseases. Liver related conditions indicating the use of milk thistle are varied, including, but not limited to:1  Alcoholic cirrhosis.oday, milk thistle is still one of the most commonly used medicinal plants in the world and is also the number one recommended natural herb for liver health.