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Aluminum Sesquichlorohydrate: An In-Depth Look at Its Role in Cosmetics

Article last updated: June 16, 2024

Table of Contents
Ever wondered what makes your favorite deodorant so effective? Dive into the fascinating world of Aluminum Sesquichlorohydrate, exploring its creation, cosmetic benefits, and potential side effects in this comprehensive guide.

What Is Aluminum Sesquichlorohydrate?

Aluminum Sesquichlorohydrate, also known as Aluminum chloride hydroxide (Al4Cl3(OH)9), is a common ingredient in many cosmetic products, particularly those designed for underarm use. This compound is primarily sourced from aluminum, a naturally occurring element, and is often referred to by other names such as Aluminum Chlorohydrate or ACH. Its chemical composition includes aluminum, chlorine, and hydroxide ions, which work together to provide its unique properties.

The history of Aluminum Sesquichlorohydrate in cosmetics dates back several decades. It was initially introduced as a more effective alternative to earlier forms of aluminum compounds used in antiperspirants. Over time, it has become a staple in the cosmetic industry due to its efficacy in reducing sweat and controlling body odor. The compound works by forming a temporary plug within the sweat ducts, thereby reducing the amount of sweat that reaches the skin’s surface.

The production of Aluminum Sesquichlorohydrate involves a chemical reaction between aluminum chloride and water, which results in the formation of aluminum chloride hydroxide. This process is carefully controlled to ensure the purity and effectiveness of the final product. The resulting compound is then incorporated into various cosmetic formulations, such as roll-ons, sprays, and creams, to provide the desired antiperspirant and deodorant effects.

The Benefits/Uses of Aluminum Sesquichlorohydrate

In this section, we will delve into the officially recognized cosmetic benefits and uses of Aluminum Sesquichlorohydrate:


One of the primary benefits of Aluminum Sesquichlorohydrate is its function as an antiperspirant. This means it helps to reduce sweating by temporarily blocking the sweat glands. When applied to the skin, it forms a gel-like plug in the sweat ducts, which reduces the amount of sweat that reaches the surface. This can be particularly beneficial for individuals who experience excessive sweating, providing them with a sense of dryness and comfort throughout the day.


Aluminum Sesquichlorohydrate also acts as an astringent. In simple terms, an astringent is a substance that can cause the contraction of skin cells and other body tissues. This property helps to tighten the skin and reduce the appearance of pores. It can also help to dry out oily skin, making it a useful ingredient in products designed for those with oily or acne-prone skin.


Another significant benefit of Aluminum Sesquichlorohydrate is its deodorant function. While it doesn’t stop the production of sweat, it helps to control body odor by inhibiting the growth of bacteria that cause odor. This makes it a common ingredient in deodorant products, helping users to feel fresh and odor-free for longer periods.

Note: The listed benefits above are exclusively based on the officially recognized and defined functions of the ingredient, as documented by the International Nomenclature of Cosmetic Ingredients (INCI).

Potential Side Effects & Other Considerations

Aluminum Sesquichlorohydrate is generally considered safe for topical use in cosmetic products. However, like any ingredient, it may cause side effects in some individuals. Here are some potential side effects associated with its use:

  • Skin irritation
  • Redness
  • Itching
  • Rash

Regarding individuals who are pregnant or breastfeeding, data and research on the topical usage of Aluminum Sesquichlorohydrate during pregnancy and breastfeeding are lacking. Therefore, it is advisable for these individuals to consult a healthcare professional for further advice before using products containing this ingredient.

Adverse reactions to Aluminum Sesquichlorohydrate are relatively uncommon, but they can occur. To minimize the risk of irritation or allergic reaction, it is recommended to conduct a patch test before widespread usage.

Aluminum Sesquichlorohydrate has a comedogenicity rating of 1, which means it is very unlikely to clog pores. This makes it a suitable option for individuals who are prone to acne, blemishes, or breakouts.

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