Ammonium Alum

Benefits
HealingDeodorantAntisepticSoothingPore ShrinkingAnti Dandruff

What is Ammonium Alum?

Ammonium Alum, chemically known as ammonium aluminum sulfate dodecahydrate, is a double salt formed from ammonium sulfate and aluminum sulfate, often sourced from mineral deposits or synthesized. In cosmetics, it falls into the category of astringents, antiperspirants, and deodorants, appearing in products like aftershaves, styptic pencils, roll-on deodorants, and some oral care items. Functionally, when applied topically in aqueous solutions, it dissociates to release aluminum ions that bind to skin proteins, inducing a temporary contraction of surface tissues. This mechanism reduces the appearance of pores, limits sweat output by partially blocking ducts, and disrupts bacterial growth responsible for odor, while providing a cooling sensation on application.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Astringent
Creates a temporary tightening and toning effect by contracting surface proteins, helping reduce the look of oiliness and refining feel on skin.
Drug astringent
An OTC drug function that helps dry, soothe, and contract tissues (e.g., for minor irritation or weeping), typically delivered with regulated active ingredients.
Oral health care drug
A regulated active used in oral products to treat or help prevent a specific condition (e.g., caries, gingivitis), subject to local OTC drug rules.
Antiperspirant
Reduces perspiration by temporarily plugging sweat ducts (commonly with aluminum salts), decreasing wetness in underarm and body antiperspirant products.

Benefits

Offers a tightening effect that refines skin texture temporarily.

Supports odor control in deodorant formulations.

Provides soothing sensation for minor skin discomforts.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals seeking oil control and pore appearance reduction.
People with known sensitivity to aluminum compounds.
People looking for natural deodorant options.
Individuals with broken or irritated skin.
Those using aftershave or styptic products for grooming.
Those preferring aluminum-free personal care products.

Safety Notes

  • Rated low hazard by EWG with scores of 1.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Ammonium Alum

What is Ammonium Alum used for in cosmetics?

Primarily as an astringent and deodorant to temporarily tighten skin and control odor.

Is Ammonium Alum safe for daily use?

Yes, it's considered low hazard in typical cosmetic concentrations by authoritative reviews.

Does it clog pores?

No, it has a comedogenic rating of 0.