La Roche Posay Effaclar Duo+ The La Roche Posay Effaclar range in general is one that Dr Maruthappu recommends because it contains salicyclic acid, niacinamide, and lipohydroxy acids. In particular she likes the La Roche Posay Effaclar Duo+ (£17) for congestion. Image Source: lookfantastic.com La Roche Posay Effaclar Duo+ £17 from lookfantastic.com Buy Now