Retinoid
Retinoid — any member of the vitamin A family of ingredients used in skincare, ranging from gentle over-the-counter esters to prescription-strength derivatives. They work by binding to receptors in skin cells to influence cell turnover and collagen production, and are widely studied for texture, tone, and signs of aging.
Key points
- The category includes retinyl esters, retinol, retinaldehyde, and prescription forms like tretinoin and adapalene.
- Skin must convert most cosmetic retinoids into retinoic acid before they become active.
- They are associated with improved cell turnover, smoother texture, and support of collagen.
- Because they can cause dryness and sensitivity, gradual introduction and daily sunscreen are commonly advised.
Frequently asked
What is the difference between retinol and a retinoid?
Retinoid is the umbrella term for all vitamin A derivatives, while retinol is one specific over-the-counter type within that family.
Why do retinoids increase sun sensitivity?
They can make the skin more reactive during use and speed cell turnover, so daily broad-spectrum sunscreen is generally recommended.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
