7-dehydrocholesterol, often called Provitamin D3, is a substance naturally present in the skin.

It is part of the biological mechanisms that help the skin maintain its balance, protection, and barrier function.

It is best known for its involvement in the processes that lead to vitamin D formation in the skin when exposed to sunlight.

In cosmetics, 7-dehydrocholesterol is used for its structural role and its affinity with the skin's natural mechanisms.

The skin barrier is the skin's defense system. When it is balanced, the skin appears more comfortable, even, and stable.

7-dehydrocholesterol, when included in balanced cosmetic formulations, helps to:

- support the barrier function

- improve the feeling of comfort
- help the skin react better to daily stresses

It works through continuity, not immediate effect.

Audry uses 7-dehydrocholesterol (Provitamin D3) as part of an essential system, along with other active ingredients selected for tolerability and efficacy.

Not as a trend, but as a structural formulation choice.

Because when the barrier is respected, the skin functions better.