Choosing the right shampoo matters more than you might think. As the product that comes into direct contact with your scalp, it does far more than simply cleanse — it can influence your hair’s overall condition, moisture levels, and the delicate balance of the scalp. More and more people are taking a closer look at ingredient lists, searching for formulas that not only cleanse effectively but also help create the right conditions for healthy-looking, stronger hair. In this guide, we explore what to look for — and what to avoid — in a shampoo formula, so you can make more informed choices when building your everyday haircare routine.
Can Shampoo Cause Hair Loss? The Ingredients That May Affect Your Hair and Scalp
When choosing a shampoo, most people focus on what the product promises to do — whether it is designed for dry, damaged, fine, or oily hair. Haircare marketing tends to emphasise visible, fast results, which means the ingredient list can easily become an afterthought.
In reality, many of us rarely take a closer look at what is actually inside our shampoo, assuming that any product available on the market will automatically be suitable for our hair and scalp. While cosmetic ingredients used in approved formulations are subject to safety regulations, certain substances may still be irritating or overly drying for some people, particularly those with sensitive or compromised scalps. Persistent irritation or dryness can affect the overall condition of the scalp and may contribute to increased breakage or shedding in susceptible individuals.
Understanding INCI: How to Read a Shampoo Ingredient List
Every cosmetic product comes with an ingredient list known as INCI — the International Nomenclature of Cosmetic Ingredients. This standardised naming system makes it possible to identify cosmetic ingredients consistently, regardless of where a product is sold.
The order in which ingredients appear is particularly useful. Ingredients present at concentrations above 1% are generally listed in descending order by weight, giving you an indication of which substances make up the majority of the formula. Ingredients at concentrations of 1% or less may be listed in any order after those present above 1%.
Understanding this distinction makes it easier to read an INCI list accurately and get a clearer picture of how a formula has been constructed.
Shampoo Ingredients to Be Mindful Of: 5 Groups That May Irritate the Scalp
The following ingredients are commonly used in haircare and are considered safe at permitted concentrations. However, depending on your scalp sensitivity, hair type, and the overall formulation, some may feel too cleansing, drying, or irritating.
SLS (Sodium Lauryl Sulfate)
SLS is a highly effective cleansing surfactant responsible for removing oil and creating a rich lather. For some people — particularly those with dry or sensitive scalps — formulas containing SLS may feel overly cleansing and can contribute to dryness, tightness, or irritation. This may also leave the hair feeling rougher and more prone to breakage.
SLES (Sodium Laureth Sulfate)
SLES is another widely used cleansing surfactant and is generally considered milder than SLS. It provides effective cleansing and foaming, but depending on its concentration and the rest of the formula, it may still feel drying on particularly sensitive or already compromised scalps.
Certain Alcohols in Shampoo
Not all alcohols are created equal. Fatty alcohols, for example, are commonly used to condition and soften the hair. Other types of alcohol may have a more drying effect depending on their concentration and the overall formulation.
Ingredients you may come across include:
- Alcohol Denat.
- Benzyl Alcohol
- Isopropyl Alcohol
- Ethanol
Context matters here. These ingredients can serve different purposes — from acting as solvents to supporting product preservation — and their presence alone does not necessarily make a formula harsh or unsuitable.
Propylene Glycol
Propylene glycol is a multifunctional ingredient commonly used as a humectant, solvent, and formulation aid. It is generally well tolerated in cosmetic products, although, like many ingredients, it may cause irritation in individuals who are particularly sensitive to it.
PEGs (Polyethylene Glycols) and PPGs (Polypropylene Glycols)
PEGs and PPGs are broad families of ingredients used for a variety of purposes, including as solvents, humectants, emulsifiers, and texture-enhancing agents. Their properties vary considerably depending on their molecular structure, so they cannot all be treated as a single category in terms of how they interact with the hair or skin.
It’s important to remember that an ingredient list should always be considered as a complete formula rather than judging individual ingredients in isolation. Concentration, formulation, frequency of use, and your individual scalp needs all influence how a shampoo performs. Learning to read ingredient lists can help you make more informed choices and find products that work best for your hair.
What Should a Good Shampoo Contain? Ingredients That Support Healthy-Looking Hair and Scalp
Choosing a good shampoo isn’t simply about avoiding certain ingredients. It’s about finding a thoughtfully balanced formula that cleanses effectively while respecting the scalp and leaving the hair feeling soft, healthy, and manageable.
Look for gentle cleansing agents that effectively remove excess sebum, impurities, and product build-up without leaving the scalp feeling stripped. Hydrating and scalp-supporting ingredients such as bioferments and prebiotics can also complement a well-formulated cleansing routine and help support a balanced scalp environment.
Botanical extracts and plant oils can bring additional conditioning benefits. Ingredients such as mongongo oil, algae extracts, and açaí can help nourish the hair, improve softness and flexibility, and enhance its natural-looking shine.
Modern haircare formulas may also incorporate peptides and amino acids, which can help condition and strengthen the feel of the hair fibre, particularly when strands have been compromised by styling or environmental stressors.
Try: The Signature Shampoo by LUÃRE — a thoughtfully formulated cleansing ritual designed to leave the scalp feeling refreshed and the hair soft, balanced, and naturally radiant.
Read More:
How Often Should You Wash Your Hair? A Guide to Proper Scalp Cleansing
How to Wash Your Hair Properly: A Step-by-Step Guide
Summer Haircare: How to Prepare Your Hair for Your Holiday
