Hello, can I drink collagen during Haifei? You can drink collagen during weight loss, which has nothing to do with weight loss. Collagen supplements your skin aging, brightens, whitens and tightens, so it has nothing to do with losing weight. Drink it if you want to lose weight. It's okay. Personally, I think so. I hope I can help you. I wish you an early success in losing weight and a bright future.