Composition for keratin fibers

A method for reshaping keratin fibers comprising:

• a) applying onto the keratin fibers a composition comprising:
• i. from 0.5 to 20% by weight, relative to the total weight of the composition, of at least one organic acidic agent chosen from glycine, taurine, alanine, proline, 2-(cyclohexylamino)ethanesulfonic acid, or mixtures of two or more thereof;
• ii. from 0.1 to 10% by weight, relative to the total weight of the composition, of at least one polymeric thickener;
• iii. at least one alkaline agent, and
• iv. at least 50% by weight, relative to the total weight of the composition, of water;
• wherein the composition has a pH ranging from 9 to 11;
• and
• wherein the composition is free of methionine;
• b) heating the keratin fibers at 50° C. to 250° C. for 1 minute to 2 hours;
• and
• c) optionally rinsing and/or drying the keratin fibers,
• wherein the method does not include application of reducing agents.

A method for providing keratin fibers with a wave or curl comprising:

• a) applying onto the keratin fibers a composition comprising:
• i. from 2 to 15% by weight, relative to the total weight of the composition, of at least one agent chosen from arginine, histidine, lysine, glycine, taurine, alanine, proline, 2-(cyclohexylamino)ethanesulfonic acid, or mixtures of two or more thereof;
• ii. from 0.5 to 2% by weight, relative to the total weight of the composition, of at least one polymeric thickener chosen from cellulose, guar gum, xanthan gum, derivatives thereof, or mixtures of two or more thereof;
• iii. optionally at least one alkaline agent;
• and
• iv. at least 50% by weight, relative to the total weight of the composition, of water;
• wherein the composition has a pH ranging from 9 to 11;
• wherein the method does not include application of reducing agents or oxidizing agents;
• b) heating the keratin fibers at a temperature ranging from 80° C. to 100° C.;
• and
• c) optionally rinsing and/or drying the keratin fibers.