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While both are powerhouse ingredients, they work best at different times. Vitamin C is an antioxidant that protects against environmental stressors during the day, so it should be used in the morning.

Retinol is light-sensitive and aids in repair, making it ideal for nighttime use.

Both are highly active ingredients. Using them together in one step can lead to significant dryness, redness, and peeling, especially for sensitive skin.

Most dermatologists recommend starting Retinol in your early 30s. It is a derivative of Vitamin A that accelerates cell turnover and boosts collagen production. Its meant to reduce the appearance of fine lines, improving skin texture, and fading hyperpigmentation caused by sun damage.