While bananas are a nutritious fruit packed with vitamins and minerals, they don't have any inherent properties that directly reduce a tan.
A tan is caused by an increase in melanin production in the skin in response to sun exposure. While bananas are a good source of Vitamin C, which is an antioxidant, they don't specifically target melanin production.
To reduce a tan, you can try using sunscreen to protect your skin from further sun damage, exfoliating to remove dead skin cells, and using skin-lightening products that contain ingredients like hydroquinone or kojic acid.
However, it's important to consult with a dermatologist before using any skin-lightening products, as they can have side effects.