Understanding Cosmetics Ingredients Labels

4 min read

Mercedes Santaella-LamApril 22, 2026

In this article:
Tips for understanding ingredient lists
How do you read cosmetic ingredient labels?
Do cosmetic companies have to list all ingredients?

Whether it’s a drugstore moisturiser or a $200 eye cream from an upscale spa, the first thing you should look at for any cosmetic product you buy isn’t the claims or product description—it’s the ingredient list.

Understanding ingredient lists isn’t something that comes naturally to everyone. How can you tell which ingredients are good for you and which aren’t, and what about those long, technical names? We’ve been deciphering these lists for years and have the tools you need to become cosmetic-ingredient savvy. Read on to make sure you’re using the best ingredients for skin.

Tips for understanding ingredient lists

Every skin care or makeup product should have its full ingredients listed on the packaging. If not listed on the actual tube or jar, it might be on the outer carton (also check for peel-back or “accordion-style” stickers, which are common on makeup products that come in small containers). Regardless, it should be somewhere you can easily find it—you shouldn’t have to dig for the information online or elsewhere to check ingredients in cosmetics (1).

Once you’ve located the list, the next thing to do is to find out what the ingredients are and begin to learn about the purpose each serves in the product. Some ingredients, like water, retinol or glycerine, are easy enough to understand. But what about cetearyl glucoside, a multi-purpose ingredient, tocopherol acetate, an antioxidant, magnesium ascorbyl phosphate and others?

This sounds exhausting (and somewhat impossible for the average consumer), but we’ve made it easy for you with our Skin Care Ingredient Dictionary. This ever-expanding skin care ingredient dictionary contains the definitions of thousands of skin care and makeup ingredients. It includes the technical as well as non-technical names of ingredients, what their purpose is, descriptions of how they work and research supporting their use and safety in cosmetics. Once you spend some time there, you’ll become familiar with the most common ingredients and be able to identify them quickly.

Perhaps most important is knowing which skin care ingredients to avoid because they can irritate skin. Many makeup and skin care products contain irritants, so stay sharp when looking out for these!

How do you read cosmetic ingredient labels?

In most cases, ingredients are listed in descending order of concentration—in other words, the ingredients present in the highest concentrations top the list, and so on. However, companies can disregard listing in order of highest to lowest concentration if an ingredient is used in a percentage that’s 1.0% or lower. These ingredients can be listed in any order, as long as the ingredients used in percentages above 1.0% are listed in order of concentration from highest to lowest.

It’s important to remember that some skin care ingredients, like peptides and hyaluronic acid, are beneficial to skin in even small concentrations. So, even if they’re not at the beginning of a skin care ingredient list, they’re still positively impacting skin.

Do cosmetic companies have to list all ingredients?

This is where cosmetic and skin care ingredient lists get a bit confusing. All ingredients must reside in the ingredient list, however, “trade secret” ingredients do not have to be individually listed (3). A common example of this practice is when a skin care or makeup company lists their blend of fragrance ingredients as “fragrance” or “parfum” instead of individually listing out each ingredient that makes up this blend. You’ve probably already seen this in action.

You may also find that some ingredients considered “incidental” make their way onto, or are left off of, ingredient lists. Incidental ingredients are those combined with other ingredients that have a specific function in a formula. The incidental ingredients have no function due to their amount being too low to convey a benefit (or risk) to skin. Despite this, some global regulations require them to be included in ingredient lists.

With these tips in mind, you’re now ready to do your own fact-finding to select the products that will do the most good for your skin! If you need some assistance, check out our Beautypedia Skin Care Ingredient Checker, a tool that lets you quickly analyse skin care products’ ingredient lists (before even making a purchase) based on meticulous, collective analysis of peer-reviewed and published research plus the latest information from ingredient suppliers.

Learn more about skin care ingredients.

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