No sunless tan will really look good unless you have a decent amount of melanin in your skin.
You get more melanin by carefully exposing your skin towards UVB-light (which will also give you vitamin D).
10-20 minutes in the middle of the day in the natural sun will do wonder for your skin and create a nice base for the sunless lotion to make you even darker.
Just be sure to never burn and use a good moisturizer, preferably based on Aloe vera or coconut milk and, of course, without SPF (SPF blocks the UVB).
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