Clinical study of the Thickening Protocol

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 strengthen the hair fibre and provide an immediate and long-lasting thickening effect*.

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

Scientifically assessed effectiveness

Ex vivo studies show that the Thickening Protocols make it possible to:

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

EVALUATION PROTOCOLS

Scientific methodology

Ex vivo studies are carried out on natural human hair strands.

The protocol consists of:

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

On each strand, several hairs are carefully selected to take precise measurements at the core of the hair fibre.

STUDY RESULTS

Results of ex vivo studies

Studies show a significant increase in hair diameter from the first use, with an immediately visible thickening effect that is enhanced with repeated applications*.

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*
Long-lasting effect: 45% after 16 applications*

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

CONSUMER RESULTS

A usage test was carried out on 70 volunteers. After 28 days of use, 2 to 3 times a week, of the Favourite Thickening Protocol (Shampoo + Mask + Serum), testers observed hydrated, stronger, nourished and lightweight hair.

Stronger, softer 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 shampoo, mask and foam, helps to hydrate, tame and strengthen weakened hair.

CONSUMER RESULTS

A usage test was carried out on 57 subjects. After 28 days of using the thickening protocol (shampoo + mask + foam) 2 to 3 times a week, testers found their hair thicker, hydrated and healthier.

96% find their hair nourished
91 % find their hair hydrated
89% find their hair stronger
86% find their hair healthier

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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

A usage test was carried out on 57 subjects. After 28 days of use, 2 to 3 times a week, of the thickening protocol (shampoo + mask + foam), testers found their hair thicker, hydrated and healthier.

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 healthier

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Thickening Protocol for Fine Normal Hair

+36% from the 1st use*

Thickening Shampoo – 200 ml
Thickening Conditioner – 200 ml
Thickening Serum – 100 ml

Results

+36% thickness from the first use*
Long-lasting effect: 38% after 16 applications*

Hair appears softer, shinier and less prone to breakage.

CONSUMER RESULTS

A formula approved by testers

A usage test was carried out on 64 volunteers. After 28 days of using the Thickening Protocol 2 to 3 times a week (shampoo + conditioner + serum), testers observed softer, more hydrated, shinier, nourished and lighter hair.

A hydrated, nourished and lightweight hair fibre

80% find their hair hydrated
81% find their hair nourished
81% find their hair silky and lightweight
78% find their hair healthier
83% find their hair 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
Thickening serum – 100 ml

Results

+35% thickness from the first use*
Long-lasting effect: 39% after 16 applications*

Hair is thicker, stronger and visibly denser, without a greasy effect.

Consumer results

A formula approved by testers

A usage test was carried out on 54 volunteers. After 28 days of use, 2 to 3 times a week, of the Thickening Protocol (Shampoo + Leave-in Conditioner + Serum), testers observed thicker, stronger, strengthened, nourished and visibly denser hair.

Stronger, denser and more radiant hair fibre

93% Find that their hair is visibly thicker
94% Find that their hair is radiant and strengthened
96% Find that their hair is nourished and silky
93% Find that their hair is stronger
94% Find that their hair is visibly denser

VIEW PRODUCT

Immediate and long-lasting effect:

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

- Thickening Protocol for bleached hair and Thickening Protocol for dry hair:
Ex vivo test, 25 tresses, 38% thicker after immediate use of the Thickening Protocol (shampoo + mask + mousse).
Long-lasting effect: +37% after 16 applications.

- Thickening Protocol for normal fine hair:
Ex vivo test, 30 25 tresses, 36% thicker after immediate use (shampoo + conditioner + serum).
Long-lasting effect: +38% thicker after 16 applications.

- Favourite Thickening Protocol:
Ex vivo test, 25 tresses, 42% thicker after immediate use (shampoo + mask + serum).
Long-lasting effect: +45% thicker after 16 applications.

View supporting evidence (*)

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Luxéol is a brand of food supplements and cosmetic products mainly for hair and skin. Individual results may vary.

Information may change; please carefully check product labelling before use.

¹: +150 product tests: Total number of products tested by Luxéol (clinical studies, usage tests and ex vivo tests) across all products developed as of 18/06/2026.
+ 100 consumer tests as of 18/06/2026. Products counted individually, including where several products were assessed in the same study.
Cosmetics and food supplements 100% made in France, except nail care and special volume. Free from sulphated surfactants.

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

³: Excluding subscriptions. See the Terms and Conditions

⁴: BACK TO SCHOOL: Back-to-school promotion. 1 bond repair shampoo free with purchases of €50 or more. Offer valid until 30 September 2026.

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

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Clinical study of the Thickening Protocol

Thickening Protocol

Strengthened, thickened & enhanced hair

Scientifically assessed effectiveness

Scientific methodology

Results of ex vivo studies

Favourite Thickening Protocol

Stronger, softer and nourished hair fibre

Thickening Protocol for Bleached Hair

Thickening Protocol for Dry Hair

Thickening Protocol for Fine Normal Hair

Thickening Protocol for Oily Hair

Discover the range