Introduction
In these days the consumers worldwide are looking for
personal care products, in specific the cosmetic products
that assure multiple benefits. Besides, they also expect
the latest advancements of technology to be incorporated
into these innovative product formulations. Facing
these trends, formulators strive to develop highly differentiated
multifunctional product formulations that focus
not only on the treatment but also on their aesthetics. A
significant number of novel products are available in the
markets that have been incorporated with a variety of
new generation active ingredients. During the incorporation
of these emerging actives, a range of formulation
challenges are normally encountered that include control
in the stability and the complications of combining
several actives into a single cosmetic formulation [1].
Although, multiple emulsions were described in 1925;