Final answer:
A mixture based on plant sources for health improvement is known as a herbal remedy, which has been used historically and continues to influence modern medicine.
Step-by-step explanation:
A mixture of ingredients based on plant sources and designed for the improvement of health or the treatment of certain conditions is known as a herbal remedy. The medicinal properties of plants have been utilized by human societies since ancient Egypt and continue to be a foundation for many modern medicines. Even today, a significant number of pharmaceuticals, like aspirin and digoxin, are derived from plant compounds or their synthetic versions. It's important to recognize that plant extracts can have varying effects depending on the concentration: they can be therapeutic, addictive, or even toxic at high concentrations.