Which of the following ingredients is commonly found in tanning lotions?

Aloe vera is commonly found in tanning lotions due to its soothing and moisturizing properties. It is widely recognized for its ability to hydrate the skin, which can help prevent dryness and enhance the overall appearance of a tan. Additionally, aloe vera contains vitamins and antioxidants that can support skin health, making it a popular choice among manufacturers of tanning products. This ingredient helps to keep skin nourished and can also aid in calming any irritation that may occur from sun exposure or tanning processes.

The other options, while they may have some relevance in skincare or other products, are less suitable in tanning lotions. Petroleum jelly, for instance, is primarily used for its occlusive properties to lock in moisture but does not contribute to achieving a tan. Alcohol can be drying to the skin and may not offer the hydration necessary for a healthy-looking tan. Hydrogen peroxide is often found in hair bleaching agents rather than skin products and could cause irritation or damage to the skin if included in tanning lotions.