Once the shampoo bars are left in your hair for a while, they deposit plant pigments coating the hair shaft.

As niche of an issue as it may seem, finding your perfect fit may be a bit more of a journey than you originally thought.Nevertheless, the hairdresser cautions that when using this shampoo to lighten hair, it is essential to add hydrogen peroxide to stimulate the product, and your hair should only lighten by two shades. It also colors and protects the hair follicles and scalp from discomfort or allergy because it is non-toxic and chemical-free. And last, but certainly not least, on our list is the Mokeru Organic Hair Darkening Shampoo. This is another hair dye shampoo, but like the Dexe Shampoo, this one is also ammonia and chemical free- so worry not about damaging your mane in search of a darker color! This shampoo darkens natural light and chemically colored hair and modifies its color. Notably, the natural extracts operate on your hair, depositing a layer of colorful pigments around it, your hair shaft, and dyeing without harming the hair structure. Shampoo bars still produce the foamy lather we all know and love, and they're formulated to be less stripping than traditional soap. If your dry hair is in need of hydration, you can also buy matching conditioner bars.

And, because they’re more compact and lightweight, less space is required to transport them, reducing their carbon footprint even further. Side note: if you often struggle with suitcase space when you go on holiday (raises hand), their smaller size is a traveller’s dream. With over five years’ experience in beauty and health journalism, Florence has written for ELLE, Women’s Fitness, Sister Magazine, National Geographic Traveller and many more, with a strong sustainability angle thread through much of her work. You may have noticed that the shampoo bars on this list contain the same ingredient, and that is polygonum multiflora. Unlike other hair dye shampoos though, this shampoo contains no ammonia and no harsh chemicals. It’s an herbal alternative to salon dyes, making it a lot less abrasive to your hair shaft. If you’re serious about care for the planet and its inhabitants, finding a shampoo that’s cruelty-free is a quality not to be looked over during your shampoo search. If it doesn’t explicitly say on the bottle that it is, chances are the product has been tested on animals. So look carefully! Do Hair Darkening Shampoos Really Work?

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CLAIM- lasts up to “over 80 washes” depending on how you use it, or “at least as long as a 16 oz bottle” If you’re making the switch to a bar shampoo for the first time, we do have to warn you that there is a bit of a transition period.

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. After a deep dive into the world of plastic-free shampoos, I landed on HiBar, a bar shampoo that’s also free of controversial ingredients such as sulfates, phthalates, parabens, and silicones. It had everything I was looking for in a shampoo—namely Some people also experience a transitional period, while their hair adjusts. If you’ve used liquid shampoos with stronger cleansing agents before, it could take a couple of weeks for your hair to reacclimatise. An apple cider vinegar hair rinse has been touted by many to help.Water quality: the water where I live is ‘soft to moderately hard.’ I also have a Berkey filter on my shower head Others recommend just focusing on the scalp, which can be a handy option for those who have greasy roots but dry ends. 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!