evidence: An Instagram post liked almost 10,000 times claims that sunglasses increase the likelihood of getting sunburned. This is false. The post caption says: "[Sunglasses] trick the brain into thinking that it’s dark due to their dark lens. This leads to a reduction in the production of melanin which is essential for vitamin D synthesis. Wearing sunglasses therefore increases your risk of low vitamin D and sunburn." As we will explain, the idea that melanin leads to vitamin D synthesis which then protects against sunburn is wrong at every step.