An aluminum salt composition comprising (a) an aluminum salt having an aluminum to chloride molar ratio of about 0.3:1 to about 3:1, an OH:Al molar ratio of about 2:1 to about 2.6:1, exhibiting a Size Exclusion Chromatography (SEC) chromatogram having a SEC Peak 4 to Peak 3 intensity ratio of at least 7, and a Peak 4 intensity greater than a Peak 5 intensity in aqueous solution, and (b) at least one buffer chosen from an amino acid, glycine, and betaine, wherein a molar ratio of buffer to aluminum is about 0.1:1 to about 3:1.
