Thickening Study

CLINICAL STUDY

Thickening Protocol

Strengthened, thickened & enhanced hair

The Thickening Protocols were developed to act directly on the hair fibre and visibly increase hair thickness, without weighing it down.

Thanks to the combination of several complementary treatments, they help to strengthen the hair structure and deliver an immediate and long-lasting thickening effect*.

The efficacy of the protocols was evaluated through 4 independent ex vivo tests, supplemented by scientific observations in the laboratory, in order to precisely measure the increase in hair diameter.

Scientifically evaluated efficacy

The ex-vivo studies demonstrate that the thickening protocols allow:

to significantly increase the hair diameter by 35 to 42% depending on the protocol*
to deliver a visible thickening effect from the first use*

EVALUATION PROTOCOLS

Scientific methodology

The ex vivo studies are conducted on strands of natural human hair.

The protocol consists of:

Measuring the hair diameter before application
Applying the full thickening protocol
Measuring the diameter of the hair fibre again using a scanning electron microscope (SEM), which uses an electron beam to measure the hair diameter at the μm scale. The measurement is taken immediately after application of the protocol.
After 16 applications of the protocol (2 months), the diameter measurement is taken again

On each strand, several hairs are carefully selected in order to carry out precise measurements at the core of the hair fibre.

STUDY RESULTS

Ex-vivo study results

The studies demonstrate a significant increase in hair diameter from the first use, with a visible thickening effect immediately and further enhanced with each application*.

Favourite Thickening Protocol

+42% from the 1st use*

Thickening Shampoo – 200 ml
Thickening Mask – 200 ml
Thickening Serum – 100 ml

Results

+42% thickness from the first use*
Lasting effect: 45% after 16 applications*

Hair appears thicker, hydrated and nourished, without being weighed down.

CONSUMER RESULTS

A consumer use test was conducted on 70 volunteers. After 28 days of use, 2 to 3 times per week, of the Favourite Thickening Protocol (Shampoo + mask + Serum), testers observed hydrated, stronger, nourished and lightweight hair.

A strengthened, soft and nourished hair fibre

87% find their hair hydrated
83% find that using the routine makes detangling and styling easier
84% find that their hair is nourished

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Thickening Protocol for Bleached Hair

+38% from the 1st use*

Thickening Shampoo – 200 ml
Thickening Conditioner – 200 ml
Thickening Mask – 200 ml
Thickening Foam – 150 ml

Results

+38% thickness from the first use*

The routine, consisting of the shampoo, mask and foam, helps to hydrate, tame and strengthen weakened hair.

CONSUMER RESULTS

A consumer use test was conducted on 57 subjects. After 28 days of use, 2 to 3 times per week, of the thickening protocol (shampoo + mask + foam), testers found their hair thicker, hydrated and in better health.

96% find that their hair is nourished
91 % find that their hair is hydrated
89% find that their hair is stronger
86% find that their hair is in better health

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Thickening Protocol for Dry Hair

+38% from the 1st use*

Thickening Shampoo – 200 ml
Thickening Mask – 200 ml
Thickening Foam – 150 ml

Results

+38% thickness from the first use*

Hair is more hydrated, stronger and visibly shinier.

CONSUMER RESULTS

A formula approved by testers

Protocol: Nourished, hydrated and strengthened hair

96% find that their hair is nourished
91% find that their hair is hydrated
89% find that their hair is stronger
86% find that their hair is in better health

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Thickening Protocol for Normal Fine Hair

+36% from the 1st use*

Thickening Shampoo – 200 ml
Thickening Conditioner – 200 ml
Sérum Épaississant – 100 ml

Results

+36% thickness from the first use*
Lasting effect: 38% after 16 applications*

Hair appears softer, shinier and less prone to breakage.

CONSUMER RESULTS

A formula approved by testers

A consumer use test was conducted on 64 volunteers. After 28 days of use of the Thickening Protocol 2 to 3 times per week (Shampoo + conditioner + Serum), testers observed softer, more hydrated, shiny, nourished and lighter hair.

A hydrated, nourished and lightweight hair fibre

80% find that their hair is hydrated
81% find that their hair is nourished
81% find that their hair is silky and lightweight
78% find that their hair is in better health
83% find that their hair is softer

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Thickening Protocol for Oily Hair

+35% from the 1st use*

Thickening Shampoo – 200 ml
Thickening Leave-In Conditioner – 150 ml
Sérum Épaississant – 100 ml

Results

+35% thickness from the first use*
Lasting effect: 39% after 16 applications*

Hair appears thicker, more resistant and visibly denser, without a greasy feel.

Consumer results

A formula approved by testers

A consumer use test was conducted on 54 volunteers. After 28 days of use, 2 to 3 times per week, of the Thickening Protocol (Shampoo + Leave-In Conditioner + Serum), testers observed thicker, more resistant, fortified, nourished and visibly denser hair.

A strengthened, dense and radiant hair fibre

93% Find that their hair is visibly thicker
94% Find that their hair is radiant and fortified
96% Find that their hair is nourished and silky
93% Find that their hair is more resistant
94% Find that their hair is visibly denser

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Immediate and long-lasting effect:

- Oily hair protocol:
Ex vivo test, 25 strands, 35% thickness after immediate use (shampoo, leave-in conditioner, serum).
Lasting effect: +39% after 16 applications

- Thickening Protocol for Bleached Hair and Thickening Protocol for Dry Hair:
Ex vivo test, 25 strands, 38% thickness after immediate use of the Thickening Protocol (shampoo + mask + foam).
Lasting effect: +37% after 16 applications.

- Thickening Protocol for Normal Fine Hair:
Ex-vivo test, 30 25 strands, 36% thickness after immediate use (shampoo + conditioner + serum).
Lasting effect: +38% thickness after 16 applications.

- Favourite Thickening Protocol:
Ex-vivo test, 25 strands, 42% thickness after immediate use (shampoo + mask + serum).
Lasting effect: +45% thickness after 16 applications.

View the supporting evidence (*)

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Food supplements should be used as part of a healthy lifestyle and should not be used as substitutes for a varied and balanced diet.
Luxéol is a brand of food supplements and cosmetic products mainly for hair and skin. Individual results may vary.

Information may change, please read product labelling carefully before use.

¹: Total number of products tested by Luxéol (clinical studies, usage tests and ex vivo tests) across all products developed, as of 27/03/2026. Products counted individually, including where several products were evaluated in the same study.
Cosmetics and food supplements 100% manufactured in France with the exception of the nail care and Special Volume products.

²: Total number of Luxéol consumer reviews recorded as of 08/04/2026: 83,760, from all sources combined (luxeol.com and third-party platforms).

³: Excluding subscriptions. See the T&Cs

**: Average rating from our customer reviews on luxeol.com and Google as of 13/05/2026.

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Curly Coily Routine: Intense hydration and enhanced curls*

Curly coily routine: softer, shinier and stronger curly to coily hair.

Curly Coily Routine: Intense hydration and enhanced curls*

Thickening Protocol

Strengthened, thickened & enhanced hair

Scientifically evaluated efficacy

Scientific methodology

Ex-vivo study results

A strengthened, soft and nourished hair fibre

Discover the range

+80,000 reviews²