Matcha is loaded with a rare and powerful group of natural polyphenol antioxidants called Catechins that work to prevent oxidative damage to cells and reduce your risk of cancer* (1). According to the National Cancer Institute, the catechins in Matcha green tea are so powerful that they may actually reduce the risk of cancer, making Matcha green tea one of the top natural cancer treatment options out there.* (2)
Koicha, or thick tea, requires significantly more matcha (usually about doubling the powder and halving the water): approximately 3.75 grams (amounting to 3 heaping chashaku scoops, or about one teaspoon) of matcha and approximately 40 ml (1.3 oz) of hot water per serving, or as many as six teaspoons to 3/4 cup of water. Because the resulting mixture is significantly thicker (with a similar consistency to liquid honey), blending it requires a slower, stirring motion that does not produce foam. Koicha is normally made with more expensive matcha from older tea trees (exceeding thirty years) and, thus, produces a milder and sweeter tea than usucha; it is served almost exclusively as part of Japanese tea ceremonies.
Like black and green tea, rooibos is rich in polyphenols, such as rutin and quercetin. Cell and animal studies, mostly from South Africa, have shown that rooibos extracts have antioxidant, immune-stimulating, and anti-cancer properties. But studies of rooibos tea in people are limited. There’s little or no evidence to back claims that it relieves constipation, headaches, eczema, asthma, insomnia, high blood pressure, mild depression, ulcers, diabetes, and so on.
Although research on the specific health benefits of matcha is limited, some studies suggest that regular consumption of green tea, in general, may help protect against certain health conditions. For instance, green tea appears to prevent age-related cognitive impairment, reduce LDL cholesterol, and reduce the risk of osteoporosis and other conditions such as prostate cancer.