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BOLDIFY Hair Thickening Fibers

3717 reviews

BOLDIFY Hair Thickening Fibers instantly cover bald spots, thinning, and patchiness across your temples, part, crown, and sides.

  • Realistic 'Real Hair' Effect
  • All Day Hold - No Embarrassing Mishaps
  • Completely Undetectable and Clump-Proof
  • Industry Best Color Match Guarantee
  • 100% Vegan & Cruelty Free
  • 100% Natural Ingredients - No Artificial Preservatives
  • Trusted by 250,000+ Happy Customers

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Thicker hair - guaranteed

Instantly Conceal Hair Loss

Real, Life-Changing Results

Only Three Natural Ingredients

Thick. Full. Undetectable. And All Yours.

If you want to cover thinning, balding, patchy spots across your temples, part, crown and sides, these are the hair fibers for you. With a natural “real hair” finish, and the perfect level of shine, these hair fibers transform thinning hair into luscious, undetectable, confidence-boosting locks… ...even if other products left your scalp longing for more.

Simply locate your thinning areas, sprinkle over the top, and admire your thicker & fuller-looking locks.
Our superior fibers BUILD HAIR FOLLICLES then HOLD TIGHT, all day long.

Gossypium Herbaceum (Cotton), Mineral-based colorants (Natural Iron Oxides), Sodium Chloride (Salt)

Proven Results

How to use

Step 1

Start with clean & dry hair

Step 2

Sprinkle BOLDIFY Hair Fibers carefully on thinning areas until desired coverage is achieved

Step 3

Pat with hand to disperse the Fibers and finish off with hairspray to lock them in place

safe & natural

BOLDIFY is committed to clean. Unlike our competitors, BOLDIFY Hair Fibers only contain three all-natural ingredients that are 100% vegan, hypoallergenic and irritation free.

Gossypium Herbaceum (Cotton)

We are proud to offer Hair Fibers that are not only more effective and realistic, but do not use animal byproducts and instead harness the power of plants.

Natural Iron Oxides

Our Hair Fibers are not colored with chemicals and use all natural Iron Oxides to achieve our realistic shades.


An effective and powerful preservative that is not only natural, but safer than some chemical alternatives used by our competitors.

We craft every bottle of BOLDIFY Hair Thickening Fibers in our GMP approved lab - without Animal Derived Ingredients or Harmful Artificial Preservatives – and we never test on animals. Rest assured you’ll see thicker hair from this NATURAL, EFFECTIVE, and SAFE product or we’ll refund you every penny – no questions asked.


Customer Reviews
4.7 Based on 3717 Reviews
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Filter Reviews:
Quintessa B.
Great product

Worked better than expected.

Great product

Well those expectations were exceeded! To say I was thrilled with the result is an understatement. A few squirts with the pump applicator and my hair line was fully restored with the bald patch replaced with a thick crop of hair. I wept tears of joy.

Amazon C.
It works!!!

Wow! Totally recommend! I can go out and not feeling insecure about aging and losing hair. Thanks!

Tulsa, O.
Great product.

Love it! It's a bit lighter than other products similar to this, but the bottle is bigger so it makes up for it.

Christian S.

This product has exceeded my expectations. My scalp has scaring from severe acne when I was younger. This product is light and easy to wash out. But stays in place all day - it looks just as great 12 hours after first application.


What do Boldify Hair Fibers do, exactly?

Boldify Hair Thickening Fibers provide instant coverage for bald patches, thinning areas, and wide parts. With a unique sheen for a real-hair effect, our wind/water/sweat-resistant Fibers provide the undetectable coverage you need to regain your confidence and live boldly! 

What are the instructions for use?

Dry and style hair as usual. Shake fibers carefully onto thinning areas; gently pat hair to set fibers in place. For best results, use Boldify Hair Volumizing Powder before use for hold, then finish with a light hairspray/setting spray for extended wear. 

Is this for men or women?

If you have hair, Boldify Fibers are for you...gender is inconsequential!

What colors do these Fibers come in?

We currently have 15 Hair Fiber Colors available:

What if my hair color is between 2 available shades?

We generally recommend going with the darker of the 2 colors for maximum coverage, as hair is typically darker at the roots. However, mixing/layering 2 different Fiber Colors is also a great way to create a custom color to best suit your individuality!

What are the ingredients?

Gossypium Herbaceum (Cotton), Mineral-based colorants (Natural Iron Oxides), Sodium Chloride (Salt)

Is this product cruelty-free?

YES! All Boldify products are created and manufactured  proudly via cruelty-free methods and processes.

Is this a spray or a shaker?

Boldify Hair Fibers come in a convenient shaker-top bottle for easy, precise application. 

Do you sell a spray-on version?

Boldify does not currently offer spray-on Hair Fibers.

Does Boldify offer a sprayer?

As our Hair Fibers are intended to be applied via the provided shaker bottle, we do not offer a sprayer attachment. 

Is there a sprayer on the market that fits Boldify bottles?

While our previous 25g bottles did accommodate certain sprayers from other brands, it is unknown if our NEW, bigger 28g bottles can. 

How can I achieve a more natural hairline with Boldify Hair Fibers?

To fill in a thinning hairline, it’s as simple as shaking the Hair Fibers gently into the hair towards the crown of the head, and patting into place. When creating a hairline with less natural hair to work with, we recommend using a Fiber Optimizing Comb for a more natural finish.

What if it rains, or if I sweat, or if it’s particularly humid/hot?

Boldify Hair Fibers are rain, wind and sweat resistant. That being said, keep in mind that longevity largely depends upon your application method, and re-application may be necessary after prolonged exposure or particularly harsh conditions. 

What type of hair is this for?

Boldify Hair Fibers are great for all hair types and textures! 

How big is the bottle?

Each bottle contains 28g of Hair Fibers - about a month's supply for the average daily user.

Is this easy to wash out?

Absolutely! Boldify Fibers can be easily removed in a single wash. 

Can the Hair Fibers be combined with other Boldify products?

Yes! We recommend using the Hair Volumizing Powder as well for maximum results, however our Hair Fibers can be combined with any Boldify product(s)! (We recommend adding products to your routine 1 at a time, as each combination will heed a unique result for each individual.)

Is this safe for use on children?

Absolutely. As with any product, we recommend reviewing the ingredients for possible interactions if the user has allergies/sensitivities. Always avoid contact with eyes; do not ingest or inhale.

What if I buy it, and it ends up being the wrong color?

We stand fully behind our Boldify Hair Thickening Fibers with our Color Match Guarantee. If you purchase a bottle of Hair Fibers and the color is not a good match for you, simply send us an email here and let us know - we’ll take care of it (either via refund or replacement) within 1 Business Day! 

What if I buy it and just don't like it?

We stand fully behind all Boldify products with our Satisfaction Guarantee. If you purchase a bottle of any Boldify product and are not completely satisfied, simply send us an email here and let us know; we’ll issue a full refund of the purchase price within 1 Business Day!

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