[Koko]

There are a good number of plant derived or natural skin lighteners like kojic acid, licorice extract, or tyrostat (which is a bit pricey) for melanin inhibition to use along with Vitamin C. I also read from some forums that MSM also helps lighten the skin and moisturize it.

I'd stay away from hydroquinone since it is carcinogenic and already banned is some countries (if i'm not mistaken).