# Overview of Active Ingredients Used in Deodorants and Antiperspirants Available on EU Market
## 2 Results
### Composition of Roll-On Antiperspirants (n = 40)  
A detailed analysis of the active components found in roll-on antiperspirants (n = 40) is shown in Figure 9. The most common group of substances (marked in dark blue in Figure 9) were aluminium salts, viz. Aluminium Chlorohydrate, found in 67.5% of the analysed preparations, and Aluminium Sesquichlorohydrate, found in 25.0%. These were followed by Aluminium Chloride (12.5%), and Potassium Alum (5.0%). Aluminium-zirconium compounds, such as Aluminium Zirconium Tetra-, Penta-, and Octachlorohydrex Gly, rarely appeared in roll-on antiperspirants, with each being identified in only one product. Among the non-antiperspirant components (marked in light blue in Figure 9), the most popular were antibacterial substances, including Alcohol (15.0%) and Chlorphenesin (7.5%), and the odour-masking compounds Ethlyhexylglycerin (17.5%) and Triethyl Citrate (7.5%). Other deodorizing substances were observed in a maximum of 5.0% of products, as follows: C12-15 Alkyl Benzoate, Silver Citrate, Carpylyl Glycol, Zinc Gluconate, Zinc Ricinoleate, Zinc Sulfate, Benzalkonium Chloride, and Octenidine HCl. Complexity of Composition of the Investigated Roll-On Antiperspirants  
Composition complexity is defined here as the number of aluminium-based ingredients in a single formulation. Roll-on antiperspirants were dominated by \"single-ingredient\" products, with this being noted in 34 out of 40 products. Five formulations included a pair of antiperspirant ingredients, as follows: (Aluminium Chlorohydrate and Aluminium Sesquichlorohydrate) in three products, (Aluminium Chlorohydrate and Potassium Alum) in one product, and (Aluminium Chloride and Aluminium Sesquichlorhydrate) in one product. Only one \"three-component\" formulation was noted, containing Aluminium Zirconium Tetrachlorohydrex Gly, Aluminium Sesquichlorohydrate, and Aluminium Chlorohydrate (Figure 10). Figure 9: Prevalence of active ingredients in roll-on antiperspirants (n = 40). Composition complexity was firstly examined for selected product forms from both categories, deodorants (roll-on and stick) and antiperspirants (roll-on). Since the results of these studies did not show any surprising trend, it was decided not to conduct this type of analysis for the remaining product forms. The total numbers of active substance occurrences in antiperspirants according to roll-on or stick form are given in Table 2. In both forms, the dominant ingredients were Parfum (86.0%), Aluminium Chlorohydrate (62.0%), and Aluminium Sesquichlorohydrate (24.0%). Aluminium Chloride (10.%) was present mainly in roll-on antiperspirants, and Aluminium Zirconium Tetrachlorohydrohex Gly (10.0%) was present mainly in stick antiperspirants. The remaining aluminium zirconium compounds were used very rarely in antiperspirants (from 2% to 4% of products). In addition to substances that inhibit sweat secretion, these preparations also included antibacterial or odour-masking substances, such as C12-15 Alkyl Benzoate, Alcohol, and Ethlyhexylglycerin (each 14.0%), as well as Trietyl Cirate and Chlorphenesin (each 6.0%).