Which of the following is a known melanin suppressant?

Kojic acid is recognized as a melanin suppressant because it works by inhibiting the enzyme tyrosinase, which is crucial in the production of melanin. By reducing the activity of this enzyme, kojic acid helps to lighten hyperpigmentation and even out skin tone. It is often used in skincare products aimed at treating conditions such as age spots, sunspots, and melasma.

On the other hand, while vitamin C is known for its brightening properties and can help reduce pigmentation over time, its primary function is more about antioxidant protection and promoting collagen synthesis rather than being a direct melanin suppressant. Salicylic acid, commonly used for acne treatment, primarily works by exfoliating the skin and reducing inflammation rather than targeting melanin production. Hyaluronic acid is a hydrating agent that helps retain moisture in the skin but does not have properties that suppress melanin formation. This makes kojic acid the most relevant choice for melanin suppression in this context.