Why do some subjects do not perceive the tingling sensorial effect of Nicomenthyl?

The sensorial strenght of Nicomenthyl depends: 1) on its concentration in the finished product 2) on the type of cosmetic formulation (water-based emulsion, hydroalcoholic lotions, fatty or anhydrous compositions, etc. 3) on the presence or absence in formulation of carriers such as: solubilizers, glycols, alcohols, light oils with high spreading values, etc. 4) on the body area where the product is applied.
The best way to evaluate the sensorial strength and longevity of Nicomenthyl is to apply on the lips a cosmetic water-based composition containing it at a concentration of 3%.