The present disclosure relates to hair care compositions such as hair treatment compositions and hair lightening compositions, methods for treating hair (e.g., lightening hair), and to kits comprising the compositions. The components of the hair treatment compositions may be included in hair lightening compositions and used to lighten and/or color hair. The hair treatment compositions typically include: (a) one or more polycarboxylic acids, and/or a salt thereof; (b) one or more amino acids, and/or a salt thereof; and optionally (c) one or more cationic conditioning agents. The hair lightening compositions further include (d) one or more bleaching agents.