An impressive mate study concluded this month (by a man that has a "magister" degree?). It's findings:
Yerba mate contains 24 vitamins and minerals, 15 amino acids, and 11 polyphenols, a group of phytochemicals which act as powerful antioxidants.
Polyphenols are considered to exhibit anticancer effects in mammals by strengthening an organism's natural defenses and protecting it against cellular destruction.
• Vitamins: A, C, E, B1, B2, Niacin (B3), B5, B Complex
• Minerals: Calcium, Manganese, Iron, Selenium, Potassium, Magnesium, Phosphorus, Zinc
• Additional Compounds: Carotene, Fatty Acids, Chlorophyll, Flavonols,
Polyphenols, Inositol, Trace Minerals, Antioxidants, Tannins, Pantothenic Acid and 15 Amino Acids.
Check it out.