Average cost per ounce: $13.02 (at the time of publication) Certifications: There are no third-party certifications, but Superzero claims this shampoo bar is vegan and cruelty-free (no animal ...

Now that we’ve wised up to the eco-benefits of reusable coffee flasks and water bottles, it’s about time we addressed the waste that comes with washing our hair. It’s safe to say there’s a ...