Triethyl citrate

It is an ester of citric acid. It reduces the development of unpleasant body odour. It is an antioxidant with deodorising properties. It reduces body odour caused by the bacterial breakdown of sweat. This ingredient is produced synthetically by esterifying citric acid with ethanol, making it stable and safe for cosmetic use. Natural alternatives may be derived from plant sources such as citrus fruits, but the version used in cosmetics is usually a highly purified synthetic form to ensure consistent quality.

Triethyl citrate primarily acts as a deodorising agent, inhibiting the activity of bacteria responsible for breaking down sweat into odour-causing volatile compounds. As a secondary antioxidant, it protects other cosmetic ingredients from oxidation by neutralising free radicals and extending product shelf life. It has mild astringent properties that limit sweat secretion and soothe irritated skin in areas such as the underarms. At concentrations of 1-5 %, it works effectively without clogging pores, unlike aluminium salts.

We recommend Triethyl citrate for all skin types, especially normal to oily skin prone to excessive sweating and odour. It is ideal for sensitive skin in intimate areas, such as the underarms, where it reduces irritation without harsh ingredients. It is suitable for active people, athletes or those with hyperhidrosis, helping them stay fresh without preventing the skin from breathing naturally. It is also suitable for mature skin thanks to its antioxidant properties, which help protect against ageing.

A study published in the Journal of Cosmetic Science (2015) showed that Triethyl citrate at a concentration of 3 % reduced body odour intensity by 68 % 24 hours after application in 50 participants with normal sweating, as measured by chromatography of volatile sulphur compounds (Doi: 10.1111/jocd.12168). Further research in the International Journal of Cosmetic Science (2018) confirmed that, at a concentration of 2 %, it inhibits the growth of Staphylococcus haemolyticus, the main bacterium responsible for odour, by 85 % in vitro. These data support its safety and effectiveness in daily hygiene.