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Ingredients of cosmetics

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Cosmetics are substances used to alter or enhance personal appearance.

Cosmetics
Cosmetics

While people often focus on the final look, the ingredients behind these products come from a vast array of sources. These can range from natural minerals and plant oils to synthetic chemicals created in laboratories. Unlike food, consumers rarely consider the specific makeup of their cosmetic products. However, the history of these ingredients shows a long journey from natural raw materials to highly regulated chemical formulas.

Many cosmetics rely on specific visual effects, such as pearlescence.

Titanium(IV) oxide
Titanium(IV) oxide

Pearlescence creates a shine or gloss on the surface of a product. One common method involves using the natural mineral mica. Makers cover the mica with a thin layer of titanium dioxide.

Titanium(IV) oxide
Titanium(IV) oxide

This coating causes goniochromism, where the color appears to change through interference effects. By varying the thickness of the titanium dioxide, the color of the product changes. Other makers use tiny flakes of material suspended in wax, such as glycol distearate. Historically, some nail polishes used shimmery flakes from fish scales, but bismuth oxychloride is now a more common substitute.

Lipstick provides a clear example of how ingredients have evolved.

Lipsticks
Lipsticks

Approximately 5,000 years ago in ancient Babylon, people used crushed semi-precious jewels to color their lips. Cleopatra used a deep red pigment made from crushed carmine beetles and used ants as a base. In contrast, modern red lipsticks often use synthetic iron oxide, which is essentially common rust. To create a finished lipstick, manufacturers crush pigment very finely, between 7 and 10 micrometres. This fine powder is mixed with castor oil and a wax base. Castor oil is frequently used because it is non-comedogenic, meaning it does not contribute to acne.

Fragrance has also undergone significant scientific development. Islamic cultures played a vital role in advancing western perfumery. They perfected steam distillation, a process used to extract fragrances from raw materials. These cultures also cultivated exotic plants like jasmine and citrus outside their native climates. In the 13th century, Crusaders brought alcohol-based perfumes from the Middle East to Europe. The first modern perfume, known as Hungary Water, was created in 1370 for Queen Elizabeth of Hungary. This led France to become the primary European center for perfume manufacture.

As science progressed, new products like antiperspirants were developed to reduce body odor. The original active ingredient in these products was aluminium chloride. Because this caused skin irritation, manufacturers switched to using aluminium chlorohydrate. However, the use of aluminium salts has become a subject of scientific study. Research involving mice has shown that aluminium chloride can increase aluminium levels in the brain and urine. Some studies even suggest that aluminium chloride can pass through the placenta in pregnant mice.

Because of these complexities, many countries have strict laws to regulate cosmetic safety. In the United States, the Food and Drug Administration (FDA) regulates color additives. Every batch of synthetic dye must be tested to ensure it is pure. For example, synthetic colors may contain up to 10 parts per million of lead or 3 parts per million of arsenic. The FDA regulates these to ensure they stay below legal limits. In the European Union, the Cosmetics Regulation 1223/2009 provides even stricter rules. This includes specific requirements for using nanoparticles and rules regarding animal testing.

Safety also depends on how products are used and maintained at home. Some mascaras contain ingredients that break down to produce formaldehyde, which helps prevent bacterial growth. If a tube of mascara is old, it may stop producing this ingredient, allowing bacteria to grow. For this reason, experts often suggest replacing mascara every few months. Understanding these ingredients helps us see how chemistry, history, and biology all meet in the products we use every day.

Lipsticks
Lipsticks
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Titanium(IV) oxide.jpg
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Lipsticks.jpg
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