Not required.
Retinol, also known as A-ol, retinol. It has certain photosensitivity, but it is only sensitive to ultraviolet rays, and it will cause changes such as stronger irritation after absorbing ultraviolet rays; it will not be affected by visible light.
The lights in everyday life are basically LED lights and do not produce ultraviolet light. So, you don’t need to avoid light when using retinol.
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Retinol acts as an anti-aging and skin conditioning agent in cosmetics with the following functions:
Improves skin aging: Retinol increases epidermal thickness, promotes the synthesis of type I collagen, GAG glycosaminoglycans, fibronectin and tropoelastin, Regulates the homeostasis of extracellular matrix in the dermis, enriches the deposition of extracellular matrix in the skin, and promotes endothelial cell proliferation, making the skin look fuller and more elastic.
Wrinkle Improvement: Retinol at 0.075% and above can improve fine lines.
Regulates skin tone: Improves hyperpigmentation.
The above effects have been confirmed by the human efficacy evaluation test, and the specific use effect varies from person to person.
According to the “List of Used Cosmetic Raw Materials (2021 Edition)” issued by the Food and Drug Administration, the highest historical concentration of its use in resident products is 1%. In this concentration range, it is safe for the skin.
However, because retinol is highly irritating, especially when the concentration is high or the skin is more sensitive, it is easy to cause redness, dryness, peeling, tingling, darkening of the skin, etc. In case of skin intolerance, it is recommended to select products with corresponding concentrations according to skin tolerance, do not pursue high concentrations.
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