What otc product will be most effective in lightening of the skin on hands?

Porcelana: Put this product(porcelana) to work tonight to perfect and even your skin tone while you sleep. Fortified with hydroquinone, which is clinically proven to be the most effective lightening ingredient, this formulation is the ideal treatment for fading dark spots, blemishes and discolorations caused by sun exposure, acne, pregnancy or oral contraceptives.

Hand lightening: Otc products may provide some benefit, but you will be much better off buying products which are typically only available through your cosmetic physician. Hydroquinone is still the most effective, but should be used only for limited periods. Other ingredients to look for include arbutin, kojic acid, licorice extract, bearberry extract, and vitamin c.