Salicylic acid is derived from what common substance?

Salicylic acid is derived from willow bark, which has been used for centuries in traditional medicine. The key component in willow bark is salicin, which the body converts into salicylic acid. This compound is well-known for its anti-inflammatory and exfoliating properties, making it particularly effective in treating acne and other skin conditions.

While aspirin is chemically related to salicylic acid—since it is acetylsalicylic acid and is derived from salicylic acid—it is not a direct source of it. Grapes and honey do not contain salicylic acid; they are associated with other beneficial properties and compounds in skincare. Hence, the direct and historical connection of salicylic acid to willow bark solidifies it as the correct answer.