The Ultimate Youth Architect Formula, which is included in this fake tan lotion, helps to keep skin looking youthful. In addition, vitamin B3 strengthens the skin barrier and replenishes its energy to stop transepidermal water loss. Skin quickly turns brown when exposed to active self-tanning ingredients based on sugar instead of UV light. For up to a week, the uppermost layer of skin is affected by these self-tanning ingredients, resulting in brown skin.