Gray hair injections, a controversial way of reversing hair discoloration, recently went viral on Chinese social media, sparking a heated debate regarding their efficacy.

The secret of reversing age-related hair discoloration has long eluded scientists and doctors all over the world, but Chinese medicine-inspired ‘gray hair injections’ are currently getting a lot of attention in China for their alleged ability to turn graying hair back to its original color. Although such products have been on the market in China for a while now, they’ve recently gone viral after a popular Chinese actor announced she had started a gray hair injection treatment in order to regain her original hair color. Her video went viral, causing an increase in online gray hair injection sales, but dermatologists and other health experts warn that the products’ efficacy has not been scientifically proven, and their potential side effects are currently unknown.