We are increasingly aware of what we apply to our skin and hair, but when it comes to choosing a truly healthy shampoo, we encounter a major obstacle: the labels are full of chemical terms that are difficult to understand.
Brands use claims like "sulfate-free," "paraben-free," or "natural," but the reality is that these products often contain other equally problematic ingredients. So, how can we know if a shampoo is truly safe? What are the ingredients we should avoid and how can we identify them in the INCI (International Nomenclature of Cosmetic Ingredients)?
We are going to explore the most controversial ingredients in shampoos, understand their function, the risks they may pose to our health, and what alternatives exist for healthy, toxin-free hair.
1. Sulfates: are they really bad or does it depend on the type?
Sulfates are surfactants, that is, the agents responsible for removing dirt and excess oil from the scalp. They are also the ingredients that create the abundant lather in commercial shampoos. But, even though many shampoos take pride in carrying the "sulfate-free" label, not all sulfates are harmful.
Some synthetic sulfates can be too harsh, removing not only dirt but also the natural oils that protect the scalp, which can lead to dryness, irritation, and even a rebound effect in oily hair. In addition, certain sulfates can be contaminated with potentially toxic byproducts, such as 1,4-dioxane, a compound classified as a possible carcinogen.
Among the most problematic sulfates are:
- Sodium Lauryl Sulfate (SLS)
- Sodium Laureth Sulfate (SLES)
- Ammonium Lauryl Sulfate (ALS)
These ingredients are usually found in the ingredients list of shampoos with the endings "-sulfate" or "-sulfonate".
Now, not all sulfates are harmful. There are milder and safer alternatives, derived from natural sources, that cleanse effectively without damaging the hair fiber or irritating the scalp.
Some safer options include:
- Sodium Coco-Sulfate (SCS): a sulfate derived from coconut oil, milder and less irritating.
- Disodium Cocoyl Glutamate: a surfactant derived from plant amino acids, ideal for sensitive skin.
- Sodium Lauroyl Sarcosinate: a biodegradable cleanser that is kinder to the scalp.
The key difference between natural and synthetic sulfates lies in their origin and harshness. While synthetic ones usually come from petroleum and have a higher potential for irritation, natural ones are derived from vegetable oils and are gentler.
To identify them in the INCI, it is useful to look for keywords: the harshest sulfates usually carry the prefix "Lauryl" or "Laureth", while the gentler ones include terms such as "Coco", "Glutamate" or "Sarcosinate".
2. Silicones: the deceptive shine
Silicones are another very common ingredient in shampoos and conditioners. They are used to give hair a smoother and shinier appearance, but they often only provide a superficial aesthetic improvement.
Silicones can build up over time, creating a barrier that prevents the hair from absorbing real hydration. This can cause the hair to become dull, weighed down, and more prone to breakage.
Among the most common and difficult-to-remove silicones are:
- Dimethicone
- Cyclopentasiloxane
- Amodimethicone
These usually appear in the INCI with endings "-cone", "-siloxane" or "-conol".
Fortunately, there are safer alternatives for those who want silky hair without resorting to synthetic silicones. Among them, the following stand out:
- Vegetable oils such as argan, coconut, or jojoba, which provide real shine and nourishment.
- Phytokeratin and plant proteins, which strengthen the hair from within.
If you are looking for beautiful and healthy hair in the long term, it is better to choose natural ingredients that truly nourish the hair fiber.
3. Parabens: preservatives under scrutiny
Parabens are preservatives widely used in the cosmetic industry to prevent the growth of bacteria and fungi. However, in recent years, there has been much debate about their safety due to their potential effect as endocrine disruptors.
Studies have shown that some parabens can mimic estrogen in the body, which could disrupt hormonal balance and be linked to problems such as infertility or the development of certain types of cancer.
The most common parabens in shampoos are:
- Methylparaben
- Propylparaben
- Butylparaben
To identify them in the INCI, simply look for the suffix "-paraben".
There are safer alternatives for preserving products without health risks:
- Benzoic acid and its salts (Sodium Benzoate, Potassium Benzoate).
- Potassium Sorbate.
- Botanical extracts with antimicrobial properties, such as Leuconostoc/Radish Root Ferment Filtrate.
Conclusion: choose a safe and conscious shampoo
In a market saturated with products that promise wonders, it is essential to learn how to read labels and differentiate between safe ingredients and those that can harm our hair health in the long run.
💡 Key tips for choosing a healthy shampoo:
✔ Avoid harsh sulfates like SLS and SLES, and opt for milder alternatives like SCS.
✔ Steer clear of non-soluble silicones that only provide a superficial improvement.
✔ Look for natural preservatives instead of parabens.
✔ Prefer natural fragrances and colorants instead of synthetic ones.
1️⃣ Darbre, P. D., & Harvey, P. W. (2008). "Paraben esters: review of recent studies of endocrine toxicity, absorption, esterase and human exposure, and discussion of potential human health risks." Journal of Applied Toxicology, 28(5), 561-578.
2️⃣ Panico, A., Serio, F., & Bagordo, F. (2019). "Skin safety: evaluation of preservatives in cosmetic formulations." Journal of Preventive Medicine and Hygiene, 60(1), E56.
3️⃣ Hansen, S. F., & Nielsen, G. D. (2008). "Endocrine-disrupting chemicals: a review of mechanisms and evidence of individual susceptibility." Basic & Clinical Pharmacology & Toxicology, 102(1), 44-52.
