Whenever I see Sienna Miller I question what's in her water, because there's no way she looks 43-years-old. The actress and model is arguably a style icon first, but her beauty looks are also perfection. In an interview, she once shared the niche (and affordable) French pharmacy product she swears by, and it delivers glowing, runway-ready skin. AT A GLANCE

Sienna Miller uses the A313 Vitamin A Pommade by Pharma Développement for younger-looking skin

It's currently in the Amazon Black Friday sale for just £12.79/ $35.20

The retinol cream was recommended to her by model Alexa Chung

Speaking to Harper's Bazaar for their 'Inside my beauty bag' series, Sienna revealed she uses the A313 Vitamin A Pommade by Pharma Développement - a retinol cream - which is available to shop at

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