Moisturizing isn’t about adding water, but preventing the water that is already there from leaving. That’s why treatments of dry skin increase in effectiveness as they decrease in actual water content ( ointment > cream > lotion) because their goal is to provide a barrier – in their case by using oil. Similarly, aloe contains substances (phytosterols) which create a barrier to decrease the skins own water loss. It has nothing to do with “adding water”.
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