Ingredient review

Ammonium Phenolsulfonate

INCI: AMMONIUM PHENOLSULFONATE

Ammonium Phenolsulfonate works as a deodorant by reducing odor-causing bacteria, but it may cause irritation for sensitive skin.

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In plain English

Ammonium Phenolsulfonate is a synthetic ingredient that helps control body odor by reducing the bacteria that cause it. It also has a mild tightening effect on the skin. Because it is a type of phenol derivative, it can be irritating for some people, especially those with sensitive or damaged skin.

Quick decision guide

Read the cautions before using

Ammonium Phenolsulfonate can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Ammonium Phenolsulfonate.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

Ammonium Phenolsulfonate is a salt of phenolsulfonic acid, produced synthetically. It is a white crystalline powder that dissolves in water and is used in personal care products for its antimicrobial and astringent properties.

How it works

In a cosmetic product, Ammonium Phenolsulfonate works by disrupting the cell walls of odor-causing bacteria on the skin, reducing their numbers. Its astringent action also temporarily tightens skin pores and reduces sweat secretion, contributing to a deodorizing effect.

Pros

Effective odor control

Reduces underarm odor by directly targeting and reducing odor-causing bacteria on the skin.

Mild astringent effect

Provides a temporary tightening sensation that can help reduce sweat and make pores appear smaller.

Cons and cautions

Potential for irritation

Can cause stinging, redness, or irritation, especially on sensitive or freshly shaved skin.

Limited safety data

There is less published research on this ingredient compared to more common deodorant actives, so its long-term safety profile is less established.

Best for

  • People looking for an effective deodorant ingredient that targets bacteria
  • Those with normal to oily skin who tolerate astringents well

Use caution if

  • Individuals with sensitive, irritated, or eczema-prone skin
  • Anyone with cuts or razor burn in the application area

Usage tips

Apply only to clean, dry, and intact skin to minimize irritation.
Avoid using immediately after shaving or on broken skin.
If you have sensitive skin, patch test on a small area before full use.

Safety summary

Ammonium Phenolsulfonate is considered safe for use in cosmetics at typical concentrations, but it carries a moderate risk of skin irritation. It is best suited for normal to oily skin and should be avoided on sensitive or compromised skin.

Research notes

Research supports its antimicrobial activity against odor-causing bacteria, but there are few modern studies on its long-term skin effects. Most safety data comes from industry assessments rather than independent clinical trials.

Common label clues

Typical concentration
Typically used at 0.1–1% in leave-on products
Regulatory status
Approved for use in cosmetics in the EU and US, but concentration limits may apply. Always follow product instructions.
Common uses
Deodorants, Antiperspirants, Body sprays, Facial toners
Environmental note
As a synthetic compound, its environmental fate is not well-documented, but it is expected to biodegrade slowly.

Good to know

  • Ammonium Phenolsulfonate is sometimes listed under the name 'Ammonium Sulfocarbolate' on older ingredient labels.
  • It is not the same as phenol (carbolic acid), which is more toxic and not used in cosmetics.

Common questions

What is Ammonium Phenolsulfonate in beauty products?

Ammonium Phenolsulfonate is a synthetic ingredient that helps control body odor by reducing the bacteria that cause it. It also has a mild tightening effect on the skin. Because it is a type of phenol derivative, it can be irritating for some people, especially those with sensitive or damaged skin.

What does Ammonium Phenolsulfonate do in a beauty product?

In a cosmetic product, Ammonium Phenolsulfonate works by disrupting the cell walls of odor-causing bacteria on the skin, reducing their numbers. Its astringent action also temporarily tightens skin pores and reduces sweat secretion, contributing to a deodorizing effect.

Is Ammonium Phenolsulfonate safe for most people?

Ammonium Phenolsulfonate is considered safe for use in cosmetics at typical concentrations, but it carries a moderate risk of skin irritation. It is best suited for normal to oily skin and should be avoided on sensitive or compromised skin.

Who should be careful with Ammonium Phenolsulfonate?

Individuals with sensitive, irritated, or eczema-prone skin Anyone with cuts or razor burn in the application area

Research sources

CosIng - European Commission databaseOpenPubChem - Ammonium PhenolsulfonateOpenPersonal Care Products Council - Ingredient SafetyOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.