It is often stated in literature that magnesium surfactants have significantly better skin compatibility than sodium, ammonium or amine neutralized anionic surfactants. Especially in the fatty alcohol sulfates which can be considered as ether sulfates with zero EO groups. In vivo tests have also proven this effect In a flex wash test on ten volunteers, nine strong and one weak reactions were found in the case of the sodium lauryl sulfate, while just one weak reaction was found in the case of a magnesium lauryl sulfate.
The advantage of the magnesium surfactants compared with other mild surfactants is that their applicational properties are practically unchanged compared with the sodium forms. From this point of view they belong to the group of basic surfactants showing high foaming and excellent cleansing properties. In case of the ether sulfate,easy thickening with electrolytes is still possible. The solubility for oils and perfumes is much greater when magnesium surfactants, rather than sodium surfactants are used.
The preservation of formulations based on magnesium surfactants is somewhat problematic. since divalent ions such as magnesium increase the resistance of microbes. Consequently, where magnesium surfactants are used in formulations, the preservation system should be carefully checked.
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