Yes, you should always use an indoor tanning lotion. They provide the three essentials of effective tanning: hydration, nutrition and oxygenation. Without a lotion it can take up to 12 minutes to start producing melanin but with lotion that production starts within the first minute. Moisturized skin tans better, more quickly and evenly and maintains the desired tan. Vitamins replenish the necessary nutrition to skin cells, promoting cell regeneration and oxygenation. Oxygen fuels skin cell functions, thereby accelerating the tanning process. There are several different types of indoor lotions, if you are looking to jumpstart your tan, try an accelerator. A bronzer will give you a boost of color and help you achieve results faster. Never leave your lotion in your car, heat activates the ingredients in your lotion and will ruin it.