Most makeup is built from a surprisingly short list of ingredient types: pigments for color, oils or silicones as a base, waxes for structure, emulsifiers to hold everything together, preservatives to keep it safe, and water. The specific combination changes depending on the product, but a foundation, lipstick, and eyeshadow all draw from the same basic toolkit. Here’s what’s actually in the products you put on your face.
The Base: Water, Oils, and Silicones
Every makeup product starts with a carrier, the substance that makes up the bulk of the formula and lets everything else spread across your skin. In liquid foundations, that carrier is typically a mix of water and silicones like cyclopentasiloxane and dimethicone, which together make up a significant chunk of the formula. Silicones are what give foundation that smooth, slippery feel on application. They fill in fine lines and create an even surface without feeling greasy.
Most liquid and cream products are emulsions, meaning they combine water-based and oil-based ingredients that wouldn’t naturally mix. Water-in-oil emulsions, where oil surrounds tiny droplets of water, tend to feel better on skin because the oil phase is what touches your face, reducing the dry or chalky feel that pigments alone would create. Powder products skip the water entirely and rely on dry minerals and silicones pressed or loosely packed together.
Where the Color Comes From
Color in makeup comes from three main sources: mineral pigments, synthetic dyes, and natural colorants. The workhorses of the group are iron oxides, which produce the reds, yellows, browns, and blacks found in nearly every foundation, eyeshadow, and blush. Titanium dioxide and zinc oxide provide white, and they’re used both as pigments and as physical sunscreen filters. Chromium oxide greens, ultramarines (for blue and violet shades), and manganese violet round out the mineral palette.
For brighter, more vivid shades, especially in lipsticks and eyeshadows, manufacturers use synthetic dyes. The FDA maintains a list of certified color additives permitted in cosmetics, including dozens of reds, yellows, blues, and greens identified by names like FD&C Red No. 40 or D&C Yellow No. 10. These synthetic colors go through batch certification to confirm their composition before they can be sold.
Natural colorants also appear on ingredient lists. Carmine, a deep red pigment, comes from cochineal insects. Annatto, derived from seeds, provides orange-red tones. Beta-carotene, the same compound that makes carrots orange, shows up in some formulas as well. For shimmer and pearlescent effects, mica (a naturally occurring mineral) and bismuth oxychloride are the most common choices. Guanine, originally sourced from fish scales, creates a similar lustrous finish.
What Holds Lipstick Together
A lipstick is roughly 20% wax, 50% oil, 15% paste, and 15% pigment by weight. The wax is what gives it structure so it holds its shape in the tube and doesn’t melt on contact with your lips. Three waxes dominate: candelilla wax (from a Mexican shrub), beeswax, and ozokerite (a mineral wax). Candelilla is the firmest of the three and typically makes up the largest share. Beeswax is softer, contributing a smoother feel but less structural strength.
The oil portion, which makes up half the formula, is what gives lipstick its glide. Sweet almond oil is a common choice, sometimes blended with synthetic emollients like octyldodecanol for a lighter texture. The balance between wax and oil determines everything about how the product feels: too much wax and it drags across your lips, too much oil and it won’t hold its shape or stay put.
How Mascara Coats Your Lashes
Mascara is essentially a paint designed to coat individual hair fibers. Its key technology is film-forming polymers, plastic-like molecules that wrap around each lash and harden into a flexible coating. Modern mascaras typically use polyurethane dispersions (the same class of polymer found in flexible coatings and adhesives) combined with positively and negatively charged polymers that interact to form a strong, even film. This layered polymer system is what provides lengthening, curling, and hold.
The black color in most mascaras comes from iron oxides or carbon black. Thickening agents like various types of modified cellulose give the formula its creamy consistency in the tube, while waxes help build volume on lashes. Waterproof versions rely more heavily on waxes and silicones that repel water, which is also why they require an oil-based remover.
Emulsifiers: The Invisible Glue
Oil and water don’t mix on their own, so any cream or liquid makeup needs emulsifiers to hold the formula together. These molecules have one end that bonds with water and another that bonds with oil, acting as a bridge between the two. Common choices include polysorbate 80, polysorbate 20, and glyceryl stearate. Without them, your foundation would separate in the bottle like salad dressing.
Emulsifiers also affect how pigments distribute through the product. In foundations, eyeshadows, and lipsticks, they help color particles spread evenly so you get consistent coverage rather than streaks or clumps. The type and amount of emulsifier a chemist chooses directly shapes the texture you feel during application.
Preservatives That Prevent Contamination
Any product containing water can grow bacteria and mold, so preservatives are a necessary part of most makeup. The single most common preservative in cosmetics is phenoxyethanol, found in about 61% of products in a recent survey of over 300 cosmetic formulations. It’s considered safe at concentrations up to 1% for all consumers, including children.
Sodium benzoate and potassium sorbate are the next most common, appearing in roughly 42% and 36% of products respectively. Benzyl alcohol shows up in about 23% of formulas. Parabens, once the default choice, have declined in popularity. Methylparaben, the most common paraben still in use, appeared in only about 10% of the products surveyed. The overall concentration of any single preservative in a finished product is quite low, ranging from 0.0015% to 2.5% depending on the specific ingredient.
Mineral Makeup: A Simpler Formula
Mineral makeup strips the ingredient list down considerably. A typical mineral powder foundation contains titanium dioxide (around 6%) and zinc oxide (around 4.2%) as its active sunscreen ingredients, with mica as the primary base. Supporting ingredients include silica for oil absorption, kaolin (a type of clay) for adhesion, and boron nitride for a silky feel. Iron oxides provide the color. Because these products contain no water, they generally don’t need traditional preservatives.
Titanium dioxide and zinc oxide pull double duty in these formulas. They’re both white pigments that help provide coverage and physical UV filters that block sunlight by sitting on top of the skin and reflecting rays. This is why many mineral powders can label themselves as sunscreen products.
Talc and Safety Testing
Talc is a finely ground mineral used in pressed powders, eyeshadows, and blushes for its ability to absorb moisture and create a smooth texture. The safety concern with talc has always been its geological proximity to asbestos, since the two minerals can form in the same rock deposits. Historically, the testing methods used to screen cosmetic talc for asbestos contamination, including the standard methods from the U.S. Pharmacopeia and the cosmetics trade association, had recognized shortcomings in sensitivity.
The FDA has proposed a rule that would require manufacturers of talc-containing cosmetics to test every batch using two complementary microscopy techniques: polarized light microscopy for initial screening and transmission electron microscopy for detecting fibers too small for optical methods to catch. This dual-method approach addresses the gaps in older testing protocols. The rule is not yet finalized, but it represents a significant tightening of oversight for one of the most scrutinized ingredients in cosmetics.
How Ingredient Safety Is Regulated
Under the Modernization of Cosmetics Regulation Act of 2022, companies that manufacture or market cosmetics in the U.S. must register each product with the FDA and list every ingredient. They’re also required to maintain records supporting the safety of their products, though the law doesn’t mandate any specific type of testing. Companies can rely on existing safety data from scientific literature, raw material suppliers, or their own studies. Animal testing is not required. The key legal standard is that the manufacturer must be able to demonstrate, through scientifically sound methods, that a product is safe for its intended use.