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Jane Feddersen

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Jane Feddersen

Jane is a former DI student-athlete and lifelong health enthusiast. Since graduating from College of Charleston where she played both indoor & beach volleyball, Jane’s spent the last four years building her marketing career with experience in project and partner management. Outside of work, her nutrition certification, dog, travel and yoga flows keep her busy.

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  3. Geologie Co-Wash Reviews
Rating: 4.7 / 5

In this Article

In this Article

Jane Feddersen

Most people use shampoo for their entire lives without ever questioning if it’s good for their hair or scalp. I know I’ve spent most of my life searching for the best price and scent, but as it turns out, most shampoo contains pretty terrible ingredients for both your scalp and your hair, from harmful sulfates to ones that lead to chemical buildup on your scalp. 


Geologie Co-wash is a new “Anti-Shampoo” that claims to clean your hair without any of the risks that traditional shampoos pose to your hair and scalp. But does it really work? Is there actually any difference? Or is this just marketing? We found out!


TLDR: Cutting to the chase

After trying out both of Geologie’s Co-Wash products, we have identified some pros and cons compared to traditional shampoos.


Geologie Co-Wash Pros and Cons


  • Top-tier formula🥼: Dermatologist-tested that naturally moderates oil production, rebuilds hair structure, and moisturizes scalp & hair


  • Less harmful☁️: Hair-and-scalp-friendly that is better for you than traditional shampoos with no detergents, sulfates, parabens, or chemical buildup


  • Better hair days: Consistently provides soft & smooth, frizz-free, manageable hair for all skin and hair types (including colored hair!)


  • Save money💰: Replaces your usual 2-step process and extends time between washes


  • Environmentally friendly🌱: Vegan and cruelty-free product with ecological packaging that creates less waste


  • Discounts: Geologie’s subscription plan saves you 10% or more 


  • No free shipping: all of Geologie’s shipments cost $4.95 – no matter how much you’re ordering (another reason to bundle and save 😉)

Keep reading to learn: 

  • What Geologie Co-Wash is
  • How it differs from traditional shampoos and alternatives
  • The benefits of using it
  • Whether or not it lives up to its claims


We got to try both their Smoothing & Cooling formulas


Best shampoo alternatives: Geologie Co-Wash vs Formulate vs Prose 

Geologie isn’t the only company on the market making safe shampoo alternatives. To help you make an informed decision about which product is best for you, here’s the info comparing Geologie to top competitors, Formulate and Prose. 

Best alternatives to shampoos
TypeCo-WashPersonalized shampoo Custom shampoo
Price1-pack: $38/ea

2-pack: $57 ($28.50/ea)

3-pack: $75.99 ($25.33/ea)

Subscription: $34.20/mo
$19 for 4oz each

$39 for 8oz set

$49 for 14oz set
Single purchase: $28.00

Subscribe: $23.80/mo
Quanitity 8 fl oz ($3.17-$3.50/oz)4-14 fl oz ($3.50-$4.75/oz)8.5oz ($2.80-$3.29/oz)
Best forMoisturizing hair & scalp

Moderating oil production

Smooth, frizz-free hair
Damaged hair

The need for an extremely personalized formula
Unique hair needs
Subscription available?
Sulfate/paraben-free?🟡 Depending on formula
Free shipping?
Ships toInternationallyUS OnlyUS Only

Geologie Co-Wash overview: Skincare for your scalp 

Geologie is a company that’s been making waves in the Men’s Care (skin, hair, body, and more) community, offering products that are less harmful and more personalized than traditional ones. The ingredients are based on years of research and innovative, dermatologist-designed formulas to produce incredible results. If you’re looking for products and routines that can take your self-care to the next level, you’re in the right place.


Geologie’s product lineup includes: 


Their newest product line, Hair Co-Wash, or “the silent shampoo killer,” is a haircare game-changer unlike any traditional shampoo you’ve ever used. It cleanses hair, leaves natural moisture, and nourishes your scalp with good-for-you, dermatologist-approved ingredients. 



What’s wrong with traditional shampoo? 

As we get older, the makeup of our hair can change, along with the texture and thickness. You may have noticed these changes, but that could also be from years of using the wrong products. Here are some of the shortcomings of traditional shampoos:


    • Sulfates: Many traditional shampoos contain harsh sulfates and chemicals that strip hair of natural oils, leaving it dry and brittle. This can lead to a vicious cycle of chemical build-up and our scalp overproducing oil, resulting in greasy hair and dandruff.
    • Scalp irritation: Not only do sulfate shampoos strip your hair of its natural oils, but they also have the potential to irritate sensitive skin. Many people find that switching from traditional shampoo to a more natural alternative helps ease itchiness, irritation, redness, or other symptoms associated with sensitive skin or eczema.
    • Parabens & preservatives: Most commercial shampoos also contain parabens as preservatives, which are known to be harmful to the human body and can sometimes trigger allergic reactions. 
    • Not suitable for colored hair: Many of the chemicals in shampoos don’t pair well with hair treatments and coloring, so if you’re using the wrong products daily, you’re doing yourself a disservice and wasting money. 
    • Hair frizz: The fact that you need to use shampoo multiple times a week can make all of these problems add up and leave you with frizzy hair that doesn’t look very healthy or attractive.




Why is co-washing better?

Co-washing, or co-wash, is when you use conditioner to cleanse your hair, with no lather or shampoo necessary. This can result in natural oil production, repaired hair, and extended time between washes. 


While that might sound like the opposite of what you need to wash your hair (hence, “Anti-Shampoo”), co-washing has many benefits over traditional shampooing. Unlike shampooing, which strips natural oils from the scalp and hair, co-washing leaves you with nourished hair that does not get dried out or greasy as quickly.


Geologie’s Co-Wash is one of the best on the market and provides several benefits compared to classic shampoo and conditioner combos.


Benefits of Co-Washing


Oftentimes, we forget that the scalp should receive the same love and care as your face skin. Co-Wash is formulated to nourish not only your hair but the skin underneath it, too. The formula avoids stripping the skin of essential oils and keeps the hair hydrated and moisturized, so it’s a great option for those with curly hair or those who shampoo their hair more often.

No harsh chemicals or sulfates

Co-Wash is free of sulfates, detergents, parabens, phthalates, PFO/PFAs, and SLS/SLEs, which makes it gentler on the hair. This is especially beneficial for those with fine hair, as it’s susceptible to damage and dryness.


Color-safe and effective on all skin and hair types

Some of the harsh chemicals and strong detergents that we’ve mentioned can lead to fading of color and breakage over time. Co-Wash cleanses the hair with a mild conditioner that leaves it looking healthy, hydrated, and vibrant, so it’s even better for those who color.

Extends time between washes

If you have oily hair, you might be inclined to shampoo every day (or more!) to keep your hair clean. Co-Wash allows you to extend the time between washes, saving you money in the long run and preventing excessive scalp drying.