Consistency is key when using retinol, because it could take several weeks before you start seeing noticeable results.

The dermatologist-recommended No7 Pure Retinol Night Cream is now on sale for $23 on Amazon. Shoppers with mature skin say the cream firms and hydrates the skin and softens fine lines and wrinkles.

If you suffer from dry or sensitive skin, it is best to start with a retinol cream over a serum. “For those with dry or ...