Chronobiology is the science of biological rhythms. The skin has a “circadian” rhythm, i.e. taking place over approximately one day (24 h). The skin cells detect the differences in light and adapt to them to mobilise their mechanisms of skin defence, regeneration, etc.
Here is a summary of the current knowledge about the circadian variations of the skin barrier: (see 8ème journées JP Marty of the SFC* December 2017).
- Skin regeneration takes place between 23:00 and 04:00: a peak in cell division is observed between midnight and 01:00, whilst it is very low during the day and its minimum is between 12:00 and 13:00
- The skin micro-circulation is also maximum between 23:00 and 04:00. This blood flow allows the removal of toxins and the uptake of nutrients to aid the process of good cell regeneration
- During the night the trans-epidermal water loss (TEWL) is also at its maximum, which corresponds to a decrease in the level of barrier function and increased permeability of the skin to external agents and/or active substances. During the day, the loss is minimal to limit dehydration and guarantee better protection of the skin against external elements (cold, wind, sun, pollutants, etc.)
- Similarly to protect the skin against external agents, the production of sebum is maximal at the end of the morning and minimal at night.
Thus, as nature is well designed, the biological rhythm of the skin is adapted to our rhythm of life. It just needs help to optimise our skin’s beauty and health!
- Give it vitamins and antioxidants in the evening for good cell regeneration overnight (Vitamins A, E and C, Coenzyme Q10, etc.)
- Give it essential fatty acids** and ceramides to strengthen the skin barrier, which is properly reconstituted when you wake
- Refill the epidermis with NMFs (natural moisturising factors) for optimum superficial hydration of the skin in the morning.
EPICOSM oleo-serums have been designed according to the skin’s needs and to meet all its basic expectations in the best way possible!
* SFC: Société Française de Cosmétologie [French Cosmetology Society]
** Essential fatty acids: fatty acids that the body cannot synthesise alone but which are absolutely essential for our bodies to function properly. They must be provided through the diet and cosmetics.