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Bar Soap for Hair Growth: What Shampoo Bars Can and Can't Do

Viori Team · ·
Updated · 2 min read
Viori Rosemary & Biotin Volumizing Shampoo Bar beside its green box with pink flowers Save

The quick answer

No soap or shampoo bar makes hair grow. A good shampoo bar can be a gentle, plastic-free way to keep the scalp clean, but ordinary bar soap is usually too alkaline, around pH 9 to 10, for hair. If you are worried about thinning or hair loss, see a dermatologist.

  • Ordinary bar soap runs about pH 9 to 10, too harsh for most hair
  • Look for a pH-balanced, sulfate-free shampoo bar instead
  • For thinning or hair loss, see a dermatologist

Hair product trends come and go - from coconut oil obsessions to CBD-infused everything. Here's something that might surprise you: bar shampoo might deserve a place in your hair care routine. And no, this isn't about rubbing regular hand soap on your scalp - it's about specialized solid shampoo bars.

Why Consider a Shampoo Bar

Rice water treatments have a big following (brands like Viori have built entire product lines around this ancient practice), and the solid bar format is one way to use them.

Without water diluting the formula, some ingredients may stay more stable in a solid bar.

The Science That Makes Bar Soap Special for Your Scalp

A good shampoo bar needs:

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  • A gentle pH level (ideally 4.5-5.5) that respects the scalp's natural balance
  • Mild cleansers like Sodium Cocoyl Isethionate that clean without stripping natural oils

Who Might Try Shampoo Bars?

Shampoo bars may suit:

  • Those with fine hair seeking density without heaviness
  • Anyone concerned about sustainability
  • People with sensitive scalps who react to liquid products containing alcohol or synthetic preservatives

For hair loss, see a dermatologist about treatment options.

Better for the Planet

Let's not overlook the environmental benefits. A shampoo bar replaces liquid bottles, which means less plastic. Plus, shipping solid products requires less fuel since you're not paying to transport water (the main ingredient in most liquid shampoos).

When formulated with ethically sourced ingredients, these products support both environmental and social sustainability - something more people are actively seeking.

How to Spot a Quality Shampoo Bar vs. Regular Soap

Not all solid shampoos are created equal. Here's what to look for:

  • pH-balanced formula (should state this on packaging)
  • Absence of harsh detergents like sodium lauryl sulfate
  • Conditioning ingredients like plant butters or oils to prevent dryness

Ordinary bar soap typically has a high pH (around 9-10) that can damage the hair shaft and irritate the scalp.

The Bottom Line

Solid hair care formulations are an area to watch. The combination of traditional ingredients (like those used by cultures with historically beautiful hair) and advanced delivery technology creates products that honor ancestral wisdom while leveraging modern science.

If you're curious, consider adding a quality shampoo bar to your routine. The planet will thank you.

Common questions

Is there a soap that helps hair growth?

No soap or shampoo has been shown to make hair grow. Cleansing keeps the scalp clean and comfortable, which is part of good hair care, but growth depends on genetics, hormones, health and nutrition. A dermatologist can look into causes of thinning and options.

Can you wash your hair with regular bar soap?

You can, but most people won't like the result. Regular soap is alkaline, around pH 9 to 10, which can rough up the cuticle and leave hair dry, tangled or dull, especially with hard water. A pH-balanced shampoo bar is gentler.

What is the difference between a shampoo bar and a bar of soap?

A shampoo bar uses mild cleansers, such as sodium cocoyl isethionate, and is made to be mildly acidic, about 4.5 to 5.5, like hair and scalp. Bar soap is made from oils and lye and is alkaline. That pH difference is why they feel so different on hair.

Who might like using a shampoo bar?

Shampoo bars suit people who want less plastic, travel often, or prefer simple routines. Some people with sensitive scalps like that many bars skip alcohol. Viori makes plastic-free, sulfate-free rice water shampoo bars if you want to try one. Choose a pH-balanced bar with conditioning ingredients.

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