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Urea is a water-soluble cosmetic ingredient and a natural component of the skin’s moisturising factor. At lower levels it is useful in daily moisturising products, while higher levels are particularly suited to rough areas such as feet, heels, elbows and hands.

Magnesium chloride hexahydrate and magnesium sulfate heptahydrate, better known as Epsom salt, are both water-soluble magnesium salts, but they are used differently in DIY cosmetics. Magnesium chloride is particularly practical for mineral sprays, while Epsom salt is ideal for baths and bath salts.