Nicimisey’s shampoo bar is among the most sustainable shampoo bars we can find, but when you pair that with its effective darkening properties, that definitely makes it a “BUY IT NOW!” option in our book.

Unlike regular hair color, which contains dangerous chemicals, this shampoo bar is composed entirely of natural herbs. It comes with valuable herbs, such as fallopian multiflora, that help to revive hair pigment cells called melanocytes.Most shampoo bars are also made with sustainable, reef-safe ingredients, so you don’t need to worry about whether your product is hurting your pipes, the environment, or your hair! This shampoo bar is 100% vegan, ethically sourced, eco-friendly and cruelty-free, as are all Arencia products. They are also, of course, cruelty-free, and made without the use of parabens, sulfates, petrolatum, and formaldehyde. Once you apply this shampoo bar to your hair, you may notice a significant improvement in the quality and color of your hair. It depends on the formulation and how you use one (particularly when it comes to washing it out properly).

How? By penetrating deep into the scalp and working to heal your hair at the source. This product doesn’t focus on fixing your strands, but rather healing the damage done at the root to bring life to current growth, and stimulate new growth. That’s why so many stylists and hair experts warn you to stay away from using shampoos with ingredients like sulfates, alcohol, parabens, and silicone; they’ll mess with the look and feel of your hair over time. In recent years, formulas have come on in leaps and bounds – long gone are the days when they would leave behind a waxy, greasy residue or become a gooey or crumbly mess after just a couple of uses. It’s no secret that John Frieda is considered a genius in the hair world, and this color deepening shampoo does not fall short of his hair expertise. While this shampoo doesn’t claim to act as a hair dye, it can gradually darken your hair over time due to the addition of henna in the ingredient list.Thankfully, the hair care world seemed to grow up alongside us, having a shampoo fit for all of our growing hair concerns. From greasy hair to hair loss prevention, it seems there’s a hair wash product for every milestone in our life. Looking for a darkening hair wash that is both gentle and effective may seem like an impossible task, but thankfully Chenri pulled through with their instant hair coloring shampoo.

You may have noticed that the shampoo bars on this list contain the same ingredient, and that is polygonum multiflora. Unlike other color depositing shampoos that “coat” the hair in pigment, leaving you with rich color but not doing anything in terms of nourishment, this shampoo is absorbed by the hair cuticles. This kind of shampoo is advised for people who wish to maintain their hair color without coloring it. Besides, all hair types and genders can benefit from this product, except curly hair because if used, it may cause wax accumulation in the strands.

But on top of being a color deepener, this shampoo is also extremely luxurious, and will leave your mane feeling nourished, healthy, and rich in feel (not just in color). 6. Polygonum Multiflorum Shampoo Bar On grey or colored hair, it has a less severe impact. On the other hand, it does not endure as long as permanent dyes. The bar weighs about the same as a tennis ball, but its ergonomic design means it fits comfortably in my hand. The company suggests that you “cup the bottom of the bar in the palm of your hand, rest the long edge against the lengths of your fingers, then use your fingertips to guide the bevelled top through your hair.”