Ingredients to avoid in cosmetics: a practical guide to reading labels
It's happened to you: you're standing in front of a shelf or browsing a website, you read the label, and all you see is a list of unpronounceable names. You walk away wondering whether that product is really good for your skin or whether it contains something you'd rather avoid. Relax — you're not the only one. Learning to read an INCI is like learning a new language, and once you master it, everything makes a lot more sense.
In this article, we'll walk you through which ingredients tend to stir up the most debate in cosmetics, why context matters (not just the name), and what practical criteria you can use to decide what goes into your toiletry bag and what doesn't.
How to read the INCI without getting lost
The INCI (International Nomenclature of Cosmetic Ingredients) is the universal language found on every cosmetic label. Here are the keys to start understanding it:
- Ingredients are listed in descending order of concentration: the first five to seven names are the ones that appear in the largest amounts in the formula.
- When an ingredient is present at less than 1%, the brand may list them in alphabetical order, so don't rely on position for the last ones.
- Latin or botanical names usually correspond to plant extracts; long chemical names are often synthetic or synthetically derived ingredients.
- Water, when listed as "Aqua" or "Water", is usually the main ingredient in creams, serums, and gels.
With this foundation, you can already start reading a product the way you read a recipe: understanding what's in the largest amounts, what's in smaller amounts, and what role each ingredient plays.
Ingredients that get mentioned the most (and how to look at them calmly)
Several ingredients spark a lot of conversation on social media and forums. Before demonizing any of them, it's worth remembering that cosmetics are dose-dependent: a very low concentration of a preservative doesn't behave the same way as the pure ingredient itself. Still, knowing about them helps you make informed decisions.
- Parabens (methylparaben, propylparaben, ethylparaben, butylparaben): these are highly effective preservatives, and their use is regulated and limited by law. If your skin is reactive or you want to avoid them, there are formulas that replace them with other preservative systems.
- Strong sulfates (Sodium Lauryl Sulfate, Sodium Laureth Sulfate): these are surfactants that produce a lot of foam. There are milder alternatives such as glucosides or cocamidopropyl betaine, especially interesting for reactive skin or dyed hair.
- Silicones (dimethicone, cyclomethicone): they aren't inherently "bad", but they form a layer over the hair that can build up and weigh it down. If your hair feels heavy, try alternating with a clarifying shampoo from time to time.
- Perfumes and synthetic fragrances (parfum, fragrance): a single word can hide dozens of allergens. For sensitive skin, it's better to opt for fragrance-free products or those with fragrances clearly declared as naturally derived.
- Mineral oils derived from petroleum (mineral oil, paraffinum liquidum): these are highly occlusive ingredients widely used in creams and balms. They work well, but if you're looking for a lighter texture or a botanical-based option, plant oils are a common alternative.
- Drying alcohols (alcohol denat.): they can dry out the skin if they appear among the first ingredients. In serums, toners, and gels, it's worth checking where they appear in the list.
See? It's not about avoiding endless blacklist ingredients, but about understanding what each ingredient does and at what concentration it appears.
Three steps to choose with criteria
- Know your skin. Sensitive, oily, combination, mature… every type tolerates different things. What works for your friend doesn't have to work for you.
- Do a patch test. Apply a small amount to the inner forearm or behind the ear and wait 24–48 hours before adding the product to your routine.
- Read the first five. If the first five to seven ingredients are Water, Glycerin, and some plant oil, you're probably looking at a simple formula. If the first ones are alcohol or perfume, the product is likely very lightweight or very fragranced.
And one extra tip: if you find it hard to remember names, keep a note on your phone with the ones you already know don't suit you. Over time, that list will keep growing, and your shopping will become faster and more confident.
At AizuaBeauty, we believe that taking care of your skin is also an act of care and attention. That's why we've curated a conscious selection of products for facial, lip, and hair care, along with jewelry and accessories designed to accompany you in the long run. We invite you to explore the catalog and choose at your own pace, without rush and without background noise.
Frequently Asked Questions
Do I really have to avoid all parabens?
You don't need to avoid them by default: their use is regulated by law, and their tolerability depends on the product and your skin type. If you're very reactive, you may prefer formulas that replace them, but they aren't universally "bad".
How do I know if an ingredient won't suit me?
The safest way is to do a patch test: apply the product to a small area (inner forearm or behind the ear) and wait 24–48 hours to see how your skin reacts.
What is the first thing I should look at on a cosmetic label?
The first five to seven ingredients on the INCI, since they are the ones present in the highest concentration and are what truly define the product's formula.
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