The invention relates to the production of hair compositions which are characterised by the presence of a combination of dicarboxylic amino acids, such as aspartic or glutamic acid, with basic amino acids, chiefly lysine and arginine, with the aim of neutralising the adverse effects of the lactic acid produced by the eccrine glands of the scalp, which is responsible for adverse effects on the hair bulb and the keratinous fibre.
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