As soon as I got my hands on Tropic Pure Lagoon Blemish Prevention Serum (£42), I slathered it on my face. The serum is made with blue spirulina to reduce inflammation and prebiotics to defend against acne-causing bacteria. Hormones make my dry skin unpredictable and prone to breakouts, but using this serum has kept my blemishes at bay without stripping my skin. — TC