Versus

L'Oréal Professionnel Metal Detox Strengthening Hair Oil Versus Kérastase Elixir Ultime Hydrating Hair Oil Serum

Hair Oil
Hair Serum
French Brand France
French Brand France

Updated on April 18, 2025

Overview

What they are

These products are both reef safe . They have a total of 5 ingredients in common

Suited For

They're both likely to be good for dry skin

Free From

They both do not contain any parabens or sulfates

What's Inside

They both contain harsh alcohols, common allergens, fragrances, oils and silicones

We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.

Ingredient Info

Click any item below to learn more and see relevant ingredients

About this product

About this product

At a glance

Click on any of the items below to learn more

Benefits

Concerns

Key Ingredients

Benefits

Concerns

Ingredients Side-by-side

found in both products

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

Emollient, Moisturising

Dimethiconol is a silicone that resembles the popular dimethicone. Like other silicones, it is an emollient. Emollients create a thin film on skin to prevent moisture from escaping.

This ingredient helps to create a silky texture and improve spreadability. Due to its high molecular weight and thickness, it is often combined with cyclopentasiloxane.

Perfuming, Solvent

Limonene is a fragrance that adds scent and taste to a formulation.

It's found in the peel oil of citrus fruits and other plants such as lavender and eucalyptus. The scent of limonene is generally described as "sweet citrus".

Limonene acts as an antioxidant, meaning it helps neutralize free radicals.

When exposed to air, oxidized limonene may sensitize the skin. Because of this, limonene is often avoided by people with sensitive skin.

The term 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term. For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance.

Learn more about Limonene
Perfuming

Linalool is a fragrance and helps add scent to products. It's derived from common plants such as cinnamon, mint, citrus, and lavender.

Like Limonene, this ingredient oxidizes when exposed to air. Oxidized linalool can cause allergies and skin sensitivity.

This ingredient has a scent that is floral, spicy tropical, and citrus-like.

Learn more about Linalool
Perfuming

Coumarins are a group of substances found naturally in plants. There are over 1300 types of coumarins identified. It has a natural vanilla scent.

Coumarin is an identified EU known allergy, meaning it may cause an allergic reaction when applied to the skin.

In many countries, coumarin is banned as a food additive. However, it can be found in soaps, tobacco products, and some alcohol drinks.

Plants use coumarins as a chemical defense. Some plants that have coumarins include lavender, tonka beans, and yellow clovers.

Learn more about Coumarin
Masking, Perfuming

Parfum is a catch-all term for an ingredient or more that is used to give a scent to products.

Also called "fragrance", this ingredient can be a blend of hundreds of chemicals or plant oils. This means every product with "fragrance" or "parfum" in the ingredients list is a different mixture.

For instance, Habanolide is a proprietary trade name for a specific aroma chemical. When used as a fragrance ingredient in cosmetics, most aroma chemicals fall under the broad labeling category of “FRAGRANCE” or “PARFUM” according to EU and US regulations.

The term 'parfum' or 'fragrance' is not regulated in many countries. In many cases, it is up to the brand to define this term.

For instance, many brands choose to label themselves as "fragrance-free" because they are not using synthetic fragrances. However, their products may still contain ingredients such as essential oils that are considered a fragrance by INCI standards.

One example is Calendula flower extract. Calendula is an essential oil that still imparts a scent or 'fragrance'.

Depending on the blend, the ingredients in the mixture can cause allergies and sensitivities on the skin. Some ingredients that are known EU allergens include linalool and citronellol.

Parfum can also be used to mask or cover an unpleasant scent.

The bottom line is: not all fragrances/parfum/ingredients are created equally. If you are worried about fragrances, we recommend taking a closer look at an ingredient. And of course, we always recommend speaking with a professional.

Learn more about Parfum

When to use

24 Routines
63% use in am
38% use in pm
63% use every day

Reviews

Here's what our community thinks

L'Oréal Professionnel Metal Detox Strengthening Hair Oil 29 ingredients

Metal Detox Strengthening Hair Oil hasn't been rated yet.
Rate it now

Kérastase Elixir Ultime Hydrating Hair Oil Serum 16 ingredients

4.6 /5
from 5 ratings
Soft (3) Straight Hair (3) Waves (2)
Alodia's avatar

Alodia

5 months ago
Review

Best hair oil ever. I have tried many others - Olaplex, argan oil, Fino, schwarzkopf, Paul Mitchell, Elvive (supposed to be a dupe but oh god it’s horrible).

It’s light weight, smells elegant and leaves my hair super soft and minimises frizz.
I apply on damp hair after NAK replends leave in cream, this combo is perfect for me.

So sad that they’ve reformulated and jacked up the price with Show more

#soft
#straight hair
Larafox's avatar

Lara

7 months ago
Review

Such a good product! Makes my hair super shiny and healthy and smells incredible. It also supports my soft curls and nourishes my hair

#soft
#curls
#waves
#straight hair