People use 15%-60% alcohol to preserve oil in water lotions.ALCOHOL is incredibly astringent,so adding it to a moisturizing lotion would leave us less moisturized than we accept.Alcohol is also known irritant-so it should not be used
as a lotion for moisturizing  for sensitive skin as it stings.

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Alcohol has been used as solvent,preservative and disinfectant.alcohol content of 15% or more do not need more preservation as the alcohol will keep the product in good condition for a very long period of time.