Thickening and volume system with 140dB Complex

Decibel

Decibel is a hair-thickening system built around its 140dB Complex. The shampoo cleanses and soothes the scalp, the Hypertrophy treatment builds thickness and volume progressively, and the lightweight conditioner hydrates without weighing hair down.

Decibel reports that the complex's ingredients have been shown to increase hair thickness and volume by up to 74%, lasting 20+ washes. Every step is sulfate-free, colour-safe, vegan and Leaping Bunny certified.

Choose home sizes or salon sizes, or save with the shampoo and conditioner duo.
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Decibel Thickening Shampoo 296 mlDecibel Thickening Shampoo 950 ml
Decibel

Decibel Thickening Shampoo and Conditioner Duo – 140dB Complex

$49.00
$49.00
Decibel Hypertrophy Treatment 236 mlDecibel Hypertrophy Treatment bottle
Decibel

Decibel Hypertrophy Treatment – Thickening and Volumizing Rinse-Out Treatment

$32.00
$32.00
Decibel Thickening Conditioner 296 mlDecibel Thickening Conditioner bottle
Decibel

Decibel Thickening Conditioner – 140dB Complex Lightweight Volumizing Conditioner

$25.00
$25.00
Decibel Thickening Shampoo 296 mlDecibel Thickening Shampoo bottle
Decibel

Decibel Thickening Shampoo – 140dB Complex Volumizing Shampoo, Sulfate-Free

$25.00
$25.00

How to choose

Thickening Shampoo

Sulfate-free cleanse, 296 or 950 ml.

Hypertrophy Treatment

Rinse-out thickening treatment, 236 or 592 ml.

Thickening Conditioner

Lightweight hydration, 296 or 950 ml.

Shampoo and Conditioner Duo

Matched pair, 2.5% less.

Explore the guides

Your questions, answered

What is the 140dB Complex?
Decibel's thickening and volumizing technology, included in the shampoo, treatment and conditioner.
How long do results last?
Decibel reports the treatment's results last 20+ washes.
Is Decibel colour-safe?
Yes, and it is sulfate-free, vegan and Leaping Bunny certified.
In what order do I use it?
Shampoo, then Hypertrophy treatment for 5 minutes, then conditioner.