(Please click through to HQhair. They might be having a sale!)Algenist's AA Barrier Serum defends the skin against environmental aggressors, shielding your pores from urban pollutants. The serum is highly saturated by the brand's patented ingredient, Alguronic Acid, a potent compound which is naturally sourced from Algae. The acid regenerates and protects the algae, helping it to thrive in some of the harshest environments in the world. Algenist's scientific team have uncovered the true power of this organism, utilising its regenerative potential for skincare. The brand boasts that visible skin improvements can be seen in as little as ten days. Harnessing the power of nature, this product contains a nourishing blend of powerful antioxidants that help to reduce the appearance of dullness and combat uneven skin tones. This formula combines the naturally-occurring antioxidants Vitamin B3, Phloretin and Ergothioneine to protect the skin and minimise the appearance of wrinkles. Suitable for all skin types. Dermatologist tested. Non-comedogenic. Hypoallergenic. Free from sulphates, parabens, and phthalates.