Standardization can be defined as the requirement to have either a minimum amount, or a range of one or
more compounds, in the herbal medicine. It refers to reproducible composition and higher quality of products,
thus providing patients greater security and increasing the level of trust in herbal medicine. As
mentioned previously, because the active constituents of herbal materials are varied in amount, the standardization
of herbal medicine production has to confront this problem (Ong 2004; Yan-ze and Yue-wei 2012). Generally, herbal medicines with constituents of known pharmacological activity were believed to act in a concert to promote recipe effectiveness. To standardize these formulations, an acceptable range of content and/or the average content of the selected
constituents must therefore be defined. The average
content can be calculated from blending different
batches of herbal drug preparation. Since raw plant
materials are used directly for TTAH preparation, it is
absolutely essential to minimize the error in plant
composition from ecological factors. The ideal
method to control the exogenous factors is a plant
tissue culture system, but this has the disadvantage of
not being cost effective. Similarly, herbal plants can be
produced under controlled agricultural conditions.
Land with steady climate is a good candidate for
growing a standardized herbal plant. Investigating
appropriate temperature, light, soil quality, and other
factors for growing specific herbal plants is also
important (Franz 1999; Sahoo et al. 2010).