Is It Safe To Wash Hair With Soap?

Find the answer to the question that you have been wondering about for years.

Medically reviewed by Dr. Zeel GandhiDr. Zeel Gandhi, BAMS
By Arshiya SyedaArshiya Syeda  • 

Wash your hair with soap to keep it healthy. Yes, you read that right. Until shampoo was invented, washing hair with soap was a common practice. Shampoo became a go-to product for every man and woman as it helped keep the scalp and hair clean, washed away sweat and grease, prevented odor and lice, and protected the hair from unexpected hair loss. But now that soap is making a comeback, is it really good for your hair? Can soap cause hair damage? Or, is a cheap and safe shampoo a good alternative? Read on to find all the answers!

protip_icon Did You Know?
According to Roman legend, the word “soap” is believed to have derived from Mount Sapo, a hilly region.

Soap For Washing Hair – Is It Good?

Soaps are designed to cleanse your skin and have an alkaline pH. Using soaps on the scalp and hair may lead to the following:

  • Tangled Hair:
Woman with tangled hair

Image: IStock

Hair tangles or knots are not pleasant to detangle. The process can be painful, time-consuming, and may cause hair breakage and damage. The alkaline pH of the soap roughens the hair shafts and makes them tangle-prone. Shampoos have an acidic pH that prevents tangling.

  • Rough Hair:
Girl with rough frizzy hair

Image: Shutterstock

Soaps do not have scalp and hair conditioning properties like shampoos. Using soap may cause frizzy hair. Soaps are solid at room temperature, and hence, adding conditioning ingredients to them is difficult than shampoos.

  • Soap Scum:
Woman washing hair with soap in a bath tub

Image: Shutterstock

  • Soap scum is the white residue that forms when soap mixes with hard water. This residue can remain on your scalp and hair, causing product buildup and issues like dandruff, dull and dirty hair.

To dig a little more, let’s look at the ingredients list of soap and if those ingredients are safe to be used on hair. Scroll down.

Ingredients In Soap – Are These Safe For Hair?

Three soaps on a towel

Image: Shutterstock

Soap contains

  • Animal fat or vegetable oils like coconut and olive oils. However, castile soap is free of animal fat and synthetic ingredients.
  • Lye or sodium hydroxide or potassium hydroxide (which has a high pH)
  • Water
  • Preservatives
  • Colors
  • Scent (essential oils)

While none of these ingredients are harmful to the skin, the high pH (alkaline) of soaps due to the presence of lye and soap scum makes them unsuitable for hair washing. However, there are a few soaps that you can use on the hair. Scroll down to find out.

What Soaps Can You Use For Washing Hair?

protip_icon Quick Tip
You can use charcoal soaps to exfoliate the scalp and detoxify your hair. Activated charcoal is an excellent clarifying agent.
Natural soaps for washing hair

Image: Shutterstock

There are a few soaps that you can use to wash hair. These hair care soaps are formulated with natural cleansing ingredients. Some may also contain moisturizing ingredients to reduce the post-wash roughness.

For instance, soaps that contain Indian soapberry (reetha), gooseberry (amla), and soap pod (shikakai) can be used for washing all hair types – straight, wavy, and curly hair.

You can also buy travel-friendly and spill-free shampoo bars. The shampoo bars are loaded with moisturizing ingredients and do not strip the natural moisture of the hair strands as regular soaps do.

Pro Tip: Always apply a conditioner after washing your hair with a shampoo bar or soap. Do a 10-minute hot oil massage before hair wash. Always wash with lukewarm water.

Infographic: Why Washing Your Hair With Soap Is A Bad Idea?

There is a good reason shampoos are preferred to soaps as a hair-cleansing agent. With minimum conditioning properties, they can cause irreparable damage to your tresses. The below infographic lists just a few of the main hair problems that can occur while washing your hair with soap.

why washing your hair with a soap is a bad idea (infographic)

Illustration: StyleCraze Design Team

Save the high-quality PDF version on your device now.

Download Infographic in PDF version Download Infographic
Download Infographic in PDF version

Soaps have an alkaline pH level, which could lead to hair issues like tangling, roughness, and product residue. Regular soaps contain ingredients like lye, animal fat, synthetic ingredients, preservatives, and colors that make them unsuitable for washing hair. You can try washing your hair with soaps made from natural ingredients like gooseberry, shikakai, and soapberry. You can also find many shampoo bars made with organic ingredients that are safe to use on your hair. These shampoos are also very useful when you are traveling or showering at the gym!

Frequently Asked Questions

Does soap make hair grow faster??

Soaps that contain natural cleansing ingredients may provide your hair with benefits. But science is yet to determine if they can speed up hair growth.

Key Takeaways

  • Soap was the go-to hair cleansing product for most people until shampoo was invented.
  • Soaps have a high alkaline pH and may cause hair tangling and roughness, making them unsuitable for hair washing.
  • Go for the soaps that are formulated with natural cleansing ingredients to cleanse your hair.

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