How to Choose Sustainable Shampoo

Updated on
January 30, 2025
Is there biodegradable shampoo?

Biodegradable is a very, very broad term, and it’s not federally regulated either. So, brands can slap the B-word on their label even if it’s not accurate. Before trusting that your product or packaging is biodegradable or compostable, check to see if the claim is substantiated or regulated, and if so, by what agency.

Is shampoo bad for the environment?

“Bad” is subjective! However, there are certain shampoo brands that contain ingredients that can cause planetary harm, like sulfates, phosphates, and synthetic fragrances and dyes. 

When shopping for shampoo, avoid products that contain sulfates, phosphates, and synthetic fragrances. Instead, look for products that are EWG certified (which ensures the product is free from chemicals of concern), Fair Trade certified (which benefits the people making the product), and the PETA or Leaping Bunny certified (which both ensure no animal testing was performed using the product). Choose a plastic-free shampoo bar to cut down on plastic waste in your shower routine.

Ingredients

Sulfates

Sulfates are a kind of surfactant, which is used to clean and create the foam we know and love. Sodium lauryl sulfate, also known as SLS, is an emulsifying cleaning agent sometimes found in shampoo. It’s used to break down and wash away the dirt and grime that water can’t get rid of on its own. It also happens to be a highly toxic threat to aquatic life, from algae, to frogs, to fish. Although there is some debate on sulfates, the World Health Organization (WHO) unequivocally states that SLS “...is toxic to aquatic organisms. It is strongly advised not to let the chemical enter into the environment.”

Phosphates

Phosphates, like trisodium phosphate, create that luscious lathering effect in our shampoo. Phosphates can also cause eutrophication, which is the mineral over-enrichment of bodies of water. This can be a natural process that develops in aquatic ecosystems, but it can also indicate nutrient imbalances due to pollution. While it might sound beautiful, algal bloom – a result of eutrophication – can be harmful to aquatic life and can contaminate drinking sources. Phosphate eutrophication can cause deoxygenation of water, which can threaten marine life and submerged plants, like reeds. This can cause an indirect effect on the habitat and food source of bird species.

Synthetic Fragrances

The most elusive ingredient of all might be fragrances. That’s because fragrances are protected from disclosure. While “fragrance” might appear to be one ingredient on the label, that word could potentially comprise hundreds of chemical compounds just for one scent! It’s not the scent that worries us, but phthalates, which enable fragrances to become soluble. They are known endocrine disruptors in both humans and aquatic life and can even lower the production of testosterone. Studies have found that prenatal exposure to phthalates can decrease mental and motor development in children. 

Packaging

Plastic-free shampoo bars are becoming more and more popular, and for good reason. These bad boys are concentrated into waterless blocks and are usually packaged in cardboard boxes. Their waterless formula means that they weigh a whole lot less than those bottles of shampoo that contain 90% water (which means less fuel required for shipping!), and their cardboard packaging creates less waste compared to bulky plastic bottles. 

Certifications

Here are some certifications to look for when shopping this category.

EWG Verified

The Environmental Working Group has created a database that aims to be the gold standard in rating personal care products based on their ingredients, ensuring products are free from the chemicals of concern to human health that are outlined in their unacceptable list. Look for the EWG logo to make sure you’re avoiding those pesky ingredients.

Fair Trade Certified

The Fair Trade certification ​​works on the ground with suppliers to ensure that people making FTC products work in safe conditions, protect the environment, and earn additional money to empower their communities. This certification has intersectional impacts, including an emphasis on safe working conditions, environmental protection, sustainable livelihoods, and Community Development Funds. If you want to rest easier knowing your sheets aren’t causing undue harm in their supply chain, get ones that are Fair Trade Certified.

Leaping Bunny

Leaping Bunny is an internationally recognized symbol that guarantees no new animal tests were conducted on any of the ingredients in a product. It’s the most stringent animal rights standard, so prioritize this one if you want to alleviate your animal welfare concerns.

PETA Cruelty Free

PETA’s Cruelty-Free offers a searchable database of companies and denotes whether they conduct, commission, or test their products on animals.

Shampoo Bar

This shampoo can be used as a biodegradable body soap for camping or traveling, includes essential oils we love like bergamot and cardamom, 85% organic ingredients.

Super Bloom Strengthening Shampoo Bar

Want a vitamin-packed shampoo? This is the one.

Moisturize Shampoo Bar

This one takes a little longer to suds up, but the wait is worth it.

Custom Shampoo

This color-safe shampoo is tailored to your needs, and free of all the bad stuff

H.A.P.I Shampoo

Sienna Naturals is a black-owned business and Cosmopolitan 2023 winner of the Holy Grail Beauty Award

Super Bloom Strengthening Shampoo Bar

This super sudsy, strengthening shampoo bar cleaness and fortifies hair without the plastic waste. It's color-safe for dyed hair and made without parabens

Find out which How to Choose Better Shampoo are better than the rest.

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