Interrelation among the investigated parameters indicated that polyphenolics, especially flavo-
noids was a key determinant on the capacities of primary
antioxidants and anti-glycation. The infusions were investigated
by principal component analysis (PCA). Cluster analysis showed
that stevia herbal tea had properties similar to those of black and
green teas, while the properties of sappan herbal tea were catego-
rized in the same group of oolong tea. It can be concluded that Thai
herbal teas could be new dietary sources for bioactive compounds
which play important roles on health benefits.