Table 1.

Overview of compounds used in this study

Short name	Compound/INCI	Commercial name	Supplier	pH
Precare	Aqua, sodium levulinate, sodium benzoate	Cosphagard® Precare	Cosphatec GmbH, Hamburg, Germany	6.1
Pretec	Phenoxyethanol, benzyl alcohol, phenylpropanol	Cosphagard® Pretec		6.0
Presol	Phenoxyethanol, benzyl alcohol, phenethyl alcohol	Cosphagard® Presol		9.8
PEA	Phenoxyethanol	Phenoxyethyl Alcohol	Symrise AG, Holzminden, Germany	7.3
SymDiol	1,2‐Hexanediol, 1,2‐Octanediol	SymDiol® 68		5.3
SymSave	Hydroxyacetophenone	SymSave® H		4.8
Zn2+	Zinc gluconate	Zinc gluconate	Sigma‐Aldrich, St. Louis, MO, USA	5.6
Oregano extract	Origanum vulgare extract	Extract of oregano leaves	Flavex Naturextrakte GmbH, Rehlingen‐Siersburg, Germany	5.3
Ajowan extract	Trachyspermum ammi extract	Extract of ajowan fruits		5.6
Clove bud extract	Syzygium aromaticum extract	Extract of clove flower bud		5.4
Myrrh extract	Commiphora myrrha extract	Extract of myrrh		5.0
Citrus extract	Glycerin, citrus reticulata fruit extract, citrus aurantium amara fruit extract, citrus aurantium sinensis peel extract, ascorbic acid, citric acid, lactic acid, water	BioSecur® C320C	BIOSECUR LAB Inc., Mont St. Hilaire, Quebec, Canada	3.5, adjusted to 6.5
CHX	Chlorhexidine digluconate	—	Sigma‐Aldrich, St. Louis, MO, USA	7.9
CPC	Cetylpyridinium chloride	RonaCare® CPC	Merck KGaA, Darmstadt, Germany	8.5

Note. INCI: international nomenclature of cosmetic ingredients.