Retinol and vitamin C are the greatest and most thoroughly researched substances for reversing signs of aging and imparting a dewy sheen to the skin.
Retinol is a vitamin A derivative used in cosmetic products to increase collagen formation and cell turnover.
Topically applied vitamin C helps prevent aging and restore skin damage. Vitamin C prevents skin damage from free radicals.
This combination of chemicals is excellent for achieving the desired preventive and anti-aging effects; nevertheless, it might cause skin irritation if used too frequently.
If you use both products together, you may experience irritation. To reduce this, try using vitamin C in the morning and retinol at night.
In the morning, apply vitamin C serum to clean, dry skin, then moisturizer and SPF 30 or higher.
In the evening, apply retinol to clean, dry skin. If your skin is dry, use a hyaluronic acid serum or moisturizing moisturizer.
Choose a vitamin C in an opaque, airtight bottle since light and air can oxidize or damage the contents, making them ineffective or irritating.
Regarding retinol: Start with a low dose and choose "encapsulated" or "time-released" retinol for sensitive skin, as these are typically less irritating.