The idea that drinking milk at night can whiten your skin is a common myth. While milk contains certain nutrients beneficial for overall health, it doesn't have any magical skin-whitening properties.
Skin color is primarily determined by melanin, a pigment produced by cells called melanocytes. While some studies suggest that certain components in milk, like lactic acid, might have a mild brightening effect on the skin, these effects are usually temporary and not significant enough to visibly whiten the skin.
Furthermore, the time of day you consume milk doesn't influence its impact on your skin.
If you're looking for ways to improve your skin's appearance, focusing on a healthy diet, staying hydrated, and using skincare products designed for skin brightening is more effective.
