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  • Boldify Hair Thickening Serum Bottle with 4oz or 118ml.
  • Boldify Hair Thickening Serum Bottle with 8oz or 236ml and packaging box.
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Hair Thickening Serum - Thicker Hair From First Application

Rated 4.8 stars
3,181 Reviews
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Get big, bouncy volume and healthy, glossy shine with the BEST Biotin hair serum for fine and thick hair! Our natural, non-greasy hair nourishment and volumizer complex is packed with Biotin for stronger, longer strands.

This natural hair thickener absorbs into and seals follicles, nourishing from the inside out for instant body and shine. Achieve the perfect blowout, fight hair fall, and banish breakage with Boldify Hair Thickening Serum for women & men!

Tired of hair loss, breakage, or snail-slow growth?
Our hair boost provides vital nutrients for a cleaner scalp & happier follicles, enhancing strand retention & inhibiting breakage. With each use Boldify nourishes, plumps, and strengthens hair, working to reverse existing damage and prevent future damage for thicker, longer, stronger, shinier locks. And with such a light feel and fresh scent, you'll look forward to using it after every wash!

Perfect salon-quality blowouts in just 3 easy steps!

1. Squeeze a dime-sized amount of serum into your palm (more for longer hair), and rub hands together;
2. Apply evenly through clean, towel-dried hair, starting at the ends and working toward roots, avoiding the scalp.
3. Style as usual by allowing hair to air dry for soft, natural fullness, or blow-dry for 3X more volume! Either way, our leave-in conditioner plumps and nourishes strands for a phenomenally full, beautifully silky finish.

Triple-action formula for a light, effortlessly voluminous finish: Unlike other hair retention oils/serums and multi-product hair care treatments, Boldify's Biotin Hair Serum weightlessly acts as 3 products in one - hair boost serum, leave-in conditioner, and plumping volumizer - to give you that "fresh from the salon" blowout look and feel - without damaging buildup and greasy, sticky residues that leave locks limp and lifeless. This perfect Biotin hair oil alternative works for all hair types and is safe for color-treated hair.

Premium results guaranteed: Over 250,000 happy, beautiful customers have already transformed their tresses with Boldify. We're so confident that you'll love our products too that we want you to try them out 100% risk-free!

We guarantee that Boldify Volumizing Hair Serum will promote gorgeous, lustrously shiny, thicker, longer, stronger hair - or we will refund you the purchase price upon request. No questions asked, no return required!
Crafted By Expert Stylists


BOLDIFY 3-in-1 Hair Thickening Serum contains Biotin to enhance strand retention and promote strand strength, minimizing hair loss due to breakage and excess fall.

While most hair serums leave your hair feeling sticky, flat and dull, BOLDIFY supports that “fresh from the salon” Brazilian blowout look, without the tacky feel. Plus, it smells delicious!

Water/Aqua/Eau, Hydroxyethylcellulose, Cocos Nucifera (Coconut) Oil, Panthenol, Biotin, Chamomilla recutita (Matricaria) Flower Extract, Achillea Millefolium Extract, Rosa Canina Fruit Extract, Melissa Officinalis Leaf Extract, Cymbopogon Schoenanthus (Lemongrass) Extract, Quercus Alba Bark Extract, Geranium Maculatum Extract, Symphytum Officinale Extract, Salvia Officinalis (Sage) Leaf Extract, Aloe Barbadensis Leaf Juice, Hamamelis Virginiana (Witch Hazel) Extract, Cetrimonium Chloride, Cetearyl Alcohol, Guar Hydroxypropyltrimonium Chloride, Methyl Gluceth-20, Polysorbate 60, Cinnamidopropyltrimonium Chloride, Amodimethicone, Glycerin, Isolaureth-6, Propylene Glycol, Octoxynol-40, Citric Acid, Fragrance/Parfum, Methylisothiazolinone, Sodium Benzoate, BFL.


Step 1

Squeeze a dime-size amount into your palm. (Less is more!)

Step 2

Work through hair with fingers, starting with the ends and working your way to the roots, stopping just short of the scalp.

Step 3

Blow dry on medium/high heat for incredible healthy fullness and all-day body!


BOLDIFY is committed to clean. These three power packed body boosters are included in our Hair Thickening Serum for their effectiveness, safety, and volumizing properties that not only work instantly, but ensure longer, stronger, healthier-looking locks long-term.


Widely known as the 'Hair Growth Vitamin', Biotin can help thicken hair over time by reducing breakage and fall, and supporting strand retention.

Coconut Oil

Coconut oil is a natural way to help your hair get longer and thicker, faster. The vitamins and essential fatty acids naturally found in coconut oil nourish the scalp, and help to remove sebum build-up from hair follicles.

Lemongrass Extract

Essences of lemongrass can help protect hair follicles from oxidative stress, promoting optimal function and healthier-looking locks.

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.

Rated 4.8 stars
Based on 3,181 reviews
Total 5 star reviews: 2.6k Total 4 star reviews: 561 Total 3 star reviews: 4 Total 2 star reviews: 1 Total 1 star reviews: 0
100%would recommend this product
3,181 reviews
  • L
    Verified Buyer
    I recommend this product
    Rated 5 stars
    21 hours ago
    Love this!

    Gives long lasting volume without buildup.

  • S
    Verified Buyer
    I recommend this product
    Rated 5 stars
    21 hours ago
    This works

    I have fine thin hair and really in need of some volume. This gives me the volume I am looking for and also the feeling of thickening. I have only been using this product a short time, but I am satisfied with the results. Also has help my hair hold a curl

  • RM
    Ricki M.
    Verified Buyer
    I recommend this product
    Rated 4 stars
    21 hours ago

    I’ve been using Boldify for years. I get volume and style.

  • PM
    P. M. S.
    Verified Buyer
    I recommend this product
    Rated 4 stars
    21 hours ago
    Worked well to thicken my hair..

    Scent could have been stronger but the product did seem to thicken and add volume to my hair. I’ve only used the product once so I will update if needed.

  • LL
    Lori L.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    Hair Thickening Serum

    My Hair feels thicker and more Healthy!!

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Hair Thickening Serum - Thicker Hair From First Application

Hair Thickening Serum - Thicker Hair From First Application