- One of the primary uses for glutathione soap is to whiten skin. Glutathione works by inhibiting the skin's production of melanin, resulting in a natural lightening of the skin. Glutathione soap is often used to treat hyperpigmentation, freckles, melasma, uneven skin tone, age spots and other uneven skin tones or many other dark spots on skin.
Skin Whitening
Using Kojic acid soap on a regular basis may help reduce the appearance of age