How do you know if shampoo has gone bad?

Have you ever wondered if your shampoo has passed its prime? It's a common concern, especially if you've had the same bottle for a while. So, how can you tell if your shampoo has gone bad? Well, there are a few telltale signs to look out for. Firstly, check the color and consistency of the shampoo. If it's discolored or has separated into layers, it's probably past its best. Additionally, take a sniff of the shampoo. If it smells off or has a strange odor, it's likely that it's gone bad. Finally, if the shampoo has been left unsealed for an extended period, it may have become contaminated with bacteria or mold, which can cause irritation to your scalp. So, always keep your shampoo tightly sealed and check it regularly for any signs of spoilage.