Oxygen produces melanin. As you breathe, your body absorbs the oxygen and your circulatory system spreads it to all of your cells-producing more melanin! By doing a 15-30 minute session prior to tanning, it will give you a 20%-30% deeper and darker tan. Oxygen also nourishes your skin, boosts circulation and opens pores which leads to deeper product penetration. The more melanin you produce, the darker you tan.
There are other great reasons to "Oxygen tan." Oxygen relieves stress, and relaxes you, and that's where you want to be before or while lying in a tanning bed.