• Before and after THIKK hair fibres on a thinning crown, with a 30g bottle
  • Before and after comparison of hair growth with a THIKK product container on a beige background
  • Advertisement for THIKK hair thickening fibers showing before and after effects on hair coverage.
  • THIKK - Instant Hair Thickening Fibres Light Blonde
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THIKK

THIKK Keratin Hair Thickening Fibres with Biotin

THIKK Keratin Hair Thickening Fibres with Biotin

£9.99 GBP
£9.99 GBP £9.99 GBP
Sale Sold out
Taxes included.
Colour
Size

Shade tip: match your roots. Between two? Go darker.

Free UK delivery over £25. Subscribe on 15g or 30g and get 20% off your first order.

✓ Washes out with shampoo ✓ Designed for everyone

THIKK Hair Thickening Fibres

Instantly Fuller, Natural-Looking Hair

100% Natural Keratin & Biotin-Infused Fibres
Premium hair-thickening fibres made from natural keratin protein, the same protein found in your own hair. Instantly add volume and fullness to thinning or fine hair. Added biotin designed to support the look of fuller, thicker hair.

Found your shade? The 30g lasts twice as long as the 15g and works out cheaper per gram (90p vs £1.07).

Undetectable, Natural Finish
Available in 9 shades, our colour fibres blend seamlessly with your natural hair for a look that’s virtually invisible, even up close.

Quick & Easy Application
The precision applicator bottle makes targeting thinning areas effortless. Shake on, blend lightly, and enjoy thicker-looking hair in seconds.

All-Day Confidence
Static-charged keratin fibres bond securely to your existing hair, staying in place through your day until you wash them out.

Unisex & Versatile
Suitable for men and women, and for all hair types. Ideal for boosting overall density or filling in specific thinning spots.

Find Your Perfect Shade & Size

Choose from 3 convenient sizes to suit your needs:

5g Mini: perfect for testing shades, travel, or quick touch-ups. Lasts a few days on fine hair.

15g: ideal for lighter or every-other-day use. Would last 4 weeks max with light to medium every day use (estimation from experience).

30g: best value. Lasts up to 8 weeks with daily use on fine hair. If hair is super fine this would likely last 6 weeks.

💡 Tip: You get 3 x the amount of a mini for less than double the cost when you buy a 15g or 30g for THIKK daily use. Subscribe on the 15g or 30g for 20% off your first order, then 10% off every refill.

FREE delivery when you spend over £25 on THIKK products!

View full details

Before THIKK. After THIKK.

Results in 30 seconds.

Real THIKK customers, fibres only. No filters. Swipe for more.

  • Thin crown, filled.
    Thin crown, filled.Fibres on dry hair, blended with fingertips.
  • Wide parting, gone.
    Wide parting, gone.Designed for everyone. Same fibres, 9 shades.
  • Fuller in seconds.
    Fuller in seconds.Built up gently over the thinning area.
  • Nobody can tell.
    Nobody can tell.Matched to the roots for a natural finish.

How to use

Thirty seconds. Three steps.

  1. Step 1 Style dry hair as usual, then lightly shake THIKK fibres onto thinning areas.
  2. Step 2 Pat or blend the fibres with your fingertips for a natural, even look.
  3. Step 3 Build coverage as needed. Lock & Hold spray to set it is coming soon.

Subscribe and save

Never run out. Pay less.

Your shade, delivered on repeat. No reordering, no running low the day before a night out.

  • 20% off your first order
  • Then 10% off every refill
  • Skip, pause or cancel any time

Subscribe and save is on 15g and 30g only. Choose subscribe above the Add to cart button.

20% Off your first orderThen 10% off every refill. 15g and 30g only.

Questions

Asked. Answered.

Anything else? Get in touch.

Will people be able to tell?

Not when the shade is right. THIKK fibres are keratin, the same protein as your hair. They cling to each strand with natural static, so they look like part of your hair instead of sitting on your scalp.

Does it stay put in wind, rain or at the gym?

Yes. It stays put all day until you wash it out with shampoo. For extra hold in wind, rain and at the gym, our Lock & Hold spray is coming soon.

Which shade should I get?

Match the colour at your roots, not the ends. If you are between two shades, pick the darker one. It blends better than going lighter. Not sure? Start with the 5g sample.

How long does a bottle last?

Used every day, a 15g lasts up to about 4 weeks and a 30g up to about 8 weeks, depending on how fine your hair is. The 5g is for trying your shade.

Do the fibres make hair grow?

No. Fibres are cosmetic. They make the hair you have look thicker the second they go on, and they wash out at night. Scalp care is coming with our Growth Oil.

What if fibres are not enough?

Fibres need some hair to cling to. If there is not much left in an area, a hair system is the better answer. Book a free 30 minute consultation with Karl.

The THIKK system

Fibres. Applicator. Lock & Hold. Growth Oil.

Coming soon

Spray applicator

Aim it where you need it. Fits 5g and 15g, or 30g. Tap for early access.

Coming soon

Lock & Hold

Sets your fibres. Holds all day. Tap for early access.

Coming soon

Growth Oil

Stronger roots. Thikker hair. Rosemary and biotin for the scalp. Tap for early access.

Now booking

Hair systems

Bespoke systems fitted by Karl. Free consultation.

Book a consultation