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The reviewer, Lexis, highly recommends the PhD Heat Styling Spray by Living proof. According to Lexis, this heat protectant contains proven ingredients such as propylene glycol and PEG-40 hydrogenated castor oil, which help reduce hair cuticle cracking and prevent the loss of amino acids in the hair. The product also features Polyquaternium-16, which makes the hair less susceptible to heat damage. Additionally, the famous healthy hair molecule in the spray decreases breakage and repels oil and dirt. Lexis emphasizes that the spray is lightweight and mentions that they have tried numerous heat protectants before, making their recommendation even more credible. Overall, Lexis is extremely satisfied with the product and intends to repurchase it.