Arava Dead Sea Pet Spa - Guidance Booklet | Page 12

The answer is complicated and we will try to answer, briefly.
1. Permeability of the substances depend on their molecular
size.
Most substances do not penetrate the epidermis.
2. Largely depends on their carriers.
3. Largely depends on whether they are “leave on” or
“washed away” products.
4. Leave on products- what their opacity or how fast they
become oxygenated.

There are acids, which contain vitamins that can penetrate
the skin.
The pharmaceutical industry use chemical compositions that
penetrate the skin.
There are medications inserted into the blank stickers or
pads to allow them to penetrate the skin.

Essential oils penetrate the skin