ABSTRACT
The development of appropriate and reliable test methods for the evaluation of hair product efficacy represents a permanent challenge. The availability of such tests is needed for:
The detection of the activity and potential advantages of a new ingredient, The assistance in the formulation of this ingredient and in the development
of new products, The development of claim substantiation files. Efficacy assessment of a hair product can be approached in two ways, which
are in many cases complementary and indispensable to obtaining an understanding of the efficacy of a hair product:
In vitro assessment using instrumental methods on hair swatches, In vivo assessment, either by instrumental methods on head, by sensory
analysis, or by consumer testing.
