Which substance acts as a super-hydrating organic compound and is used in callus softeners?

• A. Glycerin
• B. Alcohol
• C. Lactic Acid
• D. Urea

Answer: (D)

Urea is known for its exceptional ability to hydrate the skin while also helping to soften thick, hard skin. It acts as a powerful humectant, drawing and holding moisture, which makes the skin more pliable. At the same time, higher concentrations of urea have keratolytic properties, meaning they break down the compact keratin in callused areas. This combination—strong water attraction and targeted softening of keratin—lets calluses become more pliable and easier to remove.

Glycerin also attracts water but doesn’t have the keratolytic action needed to soften calluses as effectively. Lactic acid provides exfoliation and moisture but is more about removing dead skin cells than specifically softening heavy calluses. Alcohol dries skin rather than hydrates. So, urea best fits the description of a super-hydrating organic compound used in callus softeners.