The invention relates to use of chitosan or a salt thereof in an anti-perspirant composition as an anti-perspirant ingredient. Current anti-perspirants are based on aluminium, but inorganic salts have the effect of leaving white patches on clothes. Additionally there is a perceived health risk associated with aluminium The current approach is to reduce the amount of aluminium in antiperspirants or to use additional metal salts such as those of zirconium. However, this approach tends to lower the efficacy of the formulation and hence prove more expensive. Zirconium-based antiperspirants tend to leave yellow patches on clothes. Use of chitosan or a salt thereof in an anti-perspirant composition as an anti-perspirant ingredient is provided, wherein the chitosan or salt thereof has a degree of acetylation of 0-15, preferably 0-12, most preferably 0-10 %, wherein the chitosan or salt thereof is either in an anhydrous form or dissolved in water at a pH of no more than 6.0, preferably no more than 5.5, most preferably no more than 5.0.
