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"Best Shampoo for Thicker, Fuller Hair" GQ

Our superstar best-seller. Deep cleansing daily Caffeine Shampoo with Proteins and Vitamins for thicker, stronger and healthier hair. Formulated by experts in the UK using scientifically proven ingredients.

Real People, Real Results
In an independent study, 82% of users said their hair was thicker after using THIX for 28 days.

Functional Shampoo 250ml
💥 Caffeine formula to stimulate follicle growth
💪 Protein packed to strengthen roots
🌱 Vitamin rich to make hair thicker
💚 Made with vegan friendly ingredients
♻️ Plastic-free packaging
🇬🇧 UK made and developed
📦 Free shipping with 2 or more bottles

Designed to both fortify weak hair and help retain what you already have, this functional Caffeinated Shampoo stimulates, repairs and thickens the look of your hair.

Nutrient-rich and vegan, the deep-cleansing hair wash has been formulated with a high-performance combination of caffeine (a natural stimulator of hair follicle growth), essential proteins, including natural plant keratin derived from corn, soybeans and wheat (to build tissue cells and help re-energise the roots) and a blend of Niacinamide, Panthenol, Pyridoxine, Vitamin C and Vitamin E, which increases capillary circulation.

Free From
Sulphate-free, ethanol-free, paraben-free, GMO-free, cruelty-free. THIX has not been tested on animals.

This super-powered combo of Protein, Vitamins, and Caffeine is suitable for all hair types. To use, massage into wet hair. Leave on scalp for 3 minutes then rinse. For re-energised hair, use daily.

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How It Works

Caffeine Based

In short, caffeine is really good for our hair. It is scientifically proven to be a natural stimulator of hair follicle growth. Studies of human hair follicles show that caffeine increases the amount of cell energy in them by acting against a protein called phosphodiesterase. The research shows that caffeine combats hair loss by inducing hair cells to produce Adenonsine Triphophate (ATP). It is a molecule that carries energy that helps stimulate the cells to grow. Caffeine has also been shown to increase the protein insulin-like growth factor (IGF1), an important signalling molecule in promoting hair growth. More specifically, caffeine has also been shown to potentially reverse the effects of dihydrotestosterone (DHT). The main hormone involved in common balding.

Protein Strong

Our hair uses proteins to build tissue cells. Natural proteins re-energise hair roots and increase the structural strength of hair follicles making hair healthier, thicker and stronger. Keratin is the dominant protein in hair which makes up for around 90% of the composition. It is scientifically proven to generate hair growth and regeneration. Not only does the THIX formula include natural Plant Keratin derived from corn, soybeans and wheat but also the vitamin Biotin (B7) which stimulates more keratin production and can also increase the rate of follicle growth.

Vitamin Rich

Healthy hair needs nutrients to help cells thrive. Our complex THIX formula is designed to incorporate the benefits of a multitude of vitamins that all help to repair old broken follicles and to make new hair feel thicker and stronger hair. The most dominant is B3 Niacinamide, which improves blood circulation to the scalp. B5 Panthenol maintains moisture in the hair. B6 Pyridoxine supports healthy hair growth and hair revitalisation. Vitamin C promotes hair health, helps reduce hair loss and prevents dry hair and split ends. Vitamin E increases capillary circulation in the scalp which can also help promote hair growth.

Fresh & Clean

Mint AND Eucalyptus

Apart from smelling amazing, mint formulas energize your scalp and strands, leaving your hair as good as new. It's also excellent for your hair health because it cleanses without stripping away your hair's essential oils and color.


Aqua (Water), Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Betaine, Acrylates Copolymer, Betaine, Caffeine, Sodium Chloride, Propylene Glycol, Parfum (Fragrance), Phenoxyethanol, Phytantriol, Hydrolyzed Corn Protein, Glycerin, Hydrolyzed Wheat Protein, Coconut Acid, Niacinamide, Hydrolyzed Soy Protein, Benzyl Alcohol, Sodium Hydroxide, Sodium Starch Octenylsuccinate, Calcium Pantothenate, Maltodextrin, Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, Disodium EDTA, Sodium Ascorbyl Phosphate, Kigelia Africana Fruit Extract, Urea, Pyridoxine HCL, Tocopheryl Acetate, Disodium Phosphate, Limonene, Dehydroacetic Acid, Benzyl Benzoate, Leuconostoc/Radish Root Ferment Filtrate, Biotin, Cinnamomum Zeylanicum Bark Extract, Ginkgo Biloba Leaf Extract, Salvia Sclarea (Clary) Extract, Citric Acid, Silica.

How to use:

  • Shampoo


Massage into wet hair.


Leave on scalp for 3 minutes then rinse.


For re-energised hair, use daily.


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Reusable Pump

We recommend adding a reusable bottle pump to your first order to dispense THIX easily, especially the conditioner.

Please reuse the pump with your next order to cut down in single-use plastic waste.