Retinoeic Acid (Retin A)

A derivative of Vitamin A widely used in anti-ageing creams. First used as an anti-acne cream and still only has official approval for this use. The downside is that users need to wear sun-block and it can irritate the skin – itchiness and redness. Probably not suitable for sensitive skins or during pregnancy because of the risk that Vitamin A may cause birth defects.