What are the side effects of glycolic acid on hair?

Author: Katlynn Robel PhD  |  Last update: Sunday, April 27, 2025

Overusing glycolic acid on the scalp or leaving it on too long too frequently can actually cause irritation and further flakiness issues, as well as weaken your hair. Limit your use of this product to once, maybe twice a week if that, and no more than 20 to 30 minutes at a time.

Can glycolic acid damage hair?

You do have to be careful about the pH going too low if you are using something with a lot of glycolic acid. A pH of 4 is safe, especially for damaged hair; you can even go a little lower than that, but not much, before you risk damaging the hair, especially if you leave it on for longer periods of time.

What are the worst side effects of glycolic acid?

Side Effects of Glycolic Acid
  • Burning.
  • Skin rash.
  • Skin swelling.
  • Blisters or welts.
  • Skin peeling.
  • Itching.
  • Skin irritation or tenderness.
  • Chemical burns.

Can I use 7% glycolic acid on hair?

Yes, but not because of the product itself. Glycolic acid is a great ingredient to use on the scalp, however, overusing it can cause serious irritation. Remember, it is an acid after all, and it's a potent ingredient. ``Long-term use can dehydrate the scalp exacerbating the dryness further.

Which is best for hair regrowth?

Minoxidil (Rogaine).

To be most effective, apply the product to the scalp skin once daily for women and twice daily for men. Many people prefer the foam applied when the hair is wet. Products with minoxidil help many people regrow their hair or slow the rate of hair loss or both.

GLYCOLIC ACID Hacks - How To Use The Ordinary Glycolic Acid 7% Toning Solution

How long to leave glycolic acid in hair?

Apply the glycolic acid straight to your dry hair, focusing more on the scalp. Leave the glycolic acid on your scalp for 10-20 minutes as a pre-shampoo treatment. Finally, wash the glycolic acid out, shampooing and conditioning your hair as usual.

Is glycolic acid or salicylic acid better for scalp?

As glycolic is less drying than salicylic acid, it's a more suitable option for normal and dry scalps. Salicylic acid, meanwhile, is oil-soluble, so can penetrate deep into the pores to remove excess oil and unclog the follicles, explains Dr Wong.

How to fix a very dry scalp?

Your dermatologist may also recommend:
  1. A medicated shampoo such as anthralin (Zithranol®).
  2. Scale softeners containing salicylic acid to help soften thick patches.
  3. Topical medications containing vitamin D such as calcipotriene (Dovonex Scalp®). ...
  4. Light therapy (phototherapy), which exposes your skin to ultraviolet light.

What does glycolic acid do to the face?

It reduces the appearance of fine lines and wrinkles by exfoliating the top layer of the skin. This, in turn, accelerates skin cell renewal, increases collagen production, and maintains the skin's natural ability to retain hydration while preventing and reducing fine lines and wrinkles when used regularly.

Who should avoid glycolic acid?

Sensitive skin: Glycolic acid can cause skin irritation and make certain skin conditions worse. Use cautiously in people with sensitive skin.

How to use glycolic acid on scalp?

1. For oily, greasy hair or treat a flaky scalp, apply glycolic acid directly to the scalp, leave on for 10 minutes and then shampoo as usual. Use 1-2x/week. 2.

Can you overdo glycolic acid?

However, as with all chemical exfoliants, using glycolic acid too frequently, at too high a concentration, or incorrectly can result in skin irritation or damage.

Does glycolic acid break down keratin?

Glycolic acid is a weak acid that interferes with the binding force on the cell surface, reduces adhesion and keratin accumulation in keratinocytes, accelerates the renewal and shedding of epidermal cells, enables smooth flow in the hair follicle infundibulum[5], stimulates the production of collagen to increase the ...

What is a good scalp scrub?

Our top pick is Briogeo, a clarifying shampoo and scalp-scrub combo treatment that our testers said banished itchy symptoms and flakes for days on end.

Is glycolic acid bad for the kidneys?

If breathed in or absorbed by the skin, formaldehyde can lead to various health problems, including kidney damage. A 2023 case study10 also found that glycolic acid absorbed through the skin may lead to the formation of oxalate, which can cause acute kidney injury.

Why do I have crusty scabs on my scalp?

Scabs on the scalp can emerge due to folliculitis, dermatitis, psoriasis or an allergic reaction to chemical products, like hair dye or or hair treatments. It is rare for scabs to form due to severe health conditions, like skin cancer.

How do I get rid of dry scalp asap?

So, What is the Fastest Way to Get Rid of a Dry Scalp?
  1. Check Whether the Scalp is Dry or Dandruff Prone. ...
  2. Make Sure Hair isn't Washed Too Frequently. ...
  3. Turn Down the Tap Temperature. ...
  4. Wash Hair with a Nourishing Shampoo. ...
  5. Treat the Scalp to a Caring Mask Treatment. ...
  6. Drink Plenty of Water. ...
  7. Massage the Scalp to Remove Flakes.

Does scrubbing your scalp promote hair growth?

A: Dr Burg says it's important to help scalp skin cell turnover with regular exfoliation. “A build-up of cells and oils [on the scalp] can lead to imbalances, irritation, and inflammation, which can impact the scalp environment, thus affecting hair growth.”

Can you get psoriasis on your head?

Scalp psoriasis is a chronic, noncontagious, inflammatory skin condition that occurs on the scalp, causing itching, redness, and flaking. It can extend beyond the scalp onto the forehead.

Which acid is best for scalp?

Salicylic acid is viewed as a very effective and safe ingredient for treating dry skin and scalp conditions like dandruff or seborrheic dermatitis.

Where do you put glycolic acid in your hair?

Thirty minutes before you plan to shower, apply the glycolic acid along your scalp between part lines and around the hairline.

What happens if you leave glycolic acid on too long?

(1) Because glycolic acid has no end point, allowing the acid to travel deeper than intended if left on the skin too long, it requires neutralization to end the peeling process. Due to its small molecular size, glycolic acid also has the ability to absorb quickly and can cause the skin to peel unevenly.

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