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A bottle of LONDONTOWN Nail Probiotic Instant Boost, featuring a black cap and light peach-colored liquid inside, designed as a transformative nail mask perfect for strengthening thin or weak nails.
A hand applies clear nail polish, with text promoting LONDONTOWN Nail Probiotic Instant Boost—a nail mask that improves the look of weak nails in just three minutes.
A hand with neatly manicured nails holds a bottle of LONDONTOWN Nail Probiotic Instant Boost. Text highlights: fast results, strengthens weak nails, helps brittle nails recover, and supports the nail’s natural microbiome.
A bottle of LONDONTOWN Nail Probiotic Instant Boost, ideal for thin nails, sits on a surface with halved peaches in liquid.
LONDONTOWN Nail Probiotic Instant Boost features a Probiotic Complex for the microbiome, AHAs & PHAs for moisture, and Vitamin B5 (Panthenol) for deep hydration—perfect as a nail mask to support weak or thin nails.
A close-up of a hand with natural nails highlights LONDONTOWN’s Nail Probiotic Instant Boost—an ultra-nourishing nail mask for fast absorption, instant results, and stronger support for weak nails.
A close-up of fingernails in two panels: "before" shows thin, weak nails, while "after" reveals smoother, glossier nails after using LONDONTOWN Nail Probiotic Instant Boost.
A bottle of LONDONTOWN Nail Probiotic Instant Boost, featuring a black cap and light peach-colored liquid inside, designed as a transformative nail mask perfect for strengthening thin or weak nails.
A hand applies clear nail polish, with text promoting LONDONTOWN Nail Probiotic Instant Boost—a nail mask that improves the look of weak nails in just three minutes.
A hand with neatly manicured nails holds a bottle of LONDONTOWN Nail Probiotic Instant Boost. Text highlights: fast results, strengthens weak nails, helps brittle nails recover, and supports the nail’s natural microbiome.
A bottle of LONDONTOWN Nail Probiotic Instant Boost, ideal for thin nails, sits on a surface with halved peaches in liquid.
LONDONTOWN Nail Probiotic Instant Boost features a Probiotic Complex for the microbiome, AHAs & PHAs for moisture, and Vitamin B5 (Panthenol) for deep hydration—perfect as a nail mask to support weak or thin nails.
A close-up of a hand with natural nails highlights LONDONTOWN’s Nail Probiotic Instant Boost—an ultra-nourishing nail mask for fast absorption, instant results, and stronger support for weak nails.
A close-up of fingernails in two panels: "before" shows thin, weak nails, while "after" reveals smoother, glossier nails after using LONDONTOWN Nail Probiotic Instant Boost.

Nail Probiotic Instant Boost

Hydration reset for dry, brittle nails

12 ml / .4 fl oz

4.7
Rated 4.7 out of 5 stars
260 Reviews
$22.00
/
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20% OFF your first order. Use code: NAIL20
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Meet your nails’ ultimate hydration reset–this supercharged serum visibly transforms dry cuticles and brittle nails in as little as 3 minutes. The speed is in the ultra-light, silky-smooth formula: our water-based formulation absorbs quickly to deliver AHAs, PHAs, plus nourishing emollients precisely where a boost is needed. Hydration is immediately replenished as a powerhouse probiotic complex reinforces nails’ natural microbiome to support overall nail health and strength over time. Use as a pre-manicure pick-me-up to improve the look of nails and cuticles within minutes, or leave on overnight as an intensive treatment.

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  • Delivers visible results in as little as 3 minutes for mani-pedi prep, or can be left on overnight for an intensive,hydrating treatment
  • Resurfacing AHAs and PHAs rejuvenate while allowing for maximum moisturization
  • Conditioning emollients immediately replenish essential hydration
  • Powerhouse probiotics help boost natural microbiome—which is crucial in defending against environmental damage and can support overall nail health over time
  • Luxe and lightweight, fast-absorbing formula

All Nail Types

THIS PRODUCT IS

  • 21+ Free
  • Certified Vegan
  • Cruelty Free
  • Gluten Free
  • Talc Free
  • Paraben Free
  • Phthalate Free 

KEY INGREDIENTS

  • Probiotic Complex reinforces, re-balances, and supports nails’ natural microbiome to help better defend against environmental stressors
  • Alpha Hydroxy Acids (AHAs) rejuvenate nails and cuticles for optimal moisturization
  • Polyhydroxy Acids (PHAs) catalyze and boost AHA benefits for supercharged results
  • Vitamin B5 (Panthenol) helps strengthen and protect nails
  • Sweet Almond Oil softens and conditions
  • Glycerin helps preserve nails’ moisture balance

INGREDIENTS

Water (Aqua), Glycerin, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Propylene Glycol, Trisodium Phosphate, Panthenol, Lactobacillus Ferment, Phenoxyethanol, Carbomer, Peg-40 Hydrogenated Castor Oil, Laureth-4, Benzophenone-4, Butylene Glycol, Fragrance (Parfum), Ethylhexylglycerin, Vaccinium Myrtillus(Bilberry) Fruit Extract, 1,2-Hexanediol, Saccharum Officinarum (Sugar Cane) Extract, Gluconolactone, Maltobionic Acid, Citrus Limon (Lemon) Fruit Extract, Citrus Aurantium Dulcis (Orange) Fruit Extract, Lactobacillus/Soybean Ferment Extract, Tocopherol, Acer Saccharum (Sugar Maple) Extract, CI 15510, CI 19140

As a pre-mani treatment: Apply directly to nails and cuticles after removing polish. Massage in and leave on for 3 minutes. Wash and dry nails thoroughly before applying polish.

As a nail treatment: Apply to bare nails and cuticles. Massage in and do not rinse. Use up to 3 times per week. For best results, follow with your favorite Londontown nail cream.

$22.00
/
4.7
Rated 4.7 out of 5 stars
Based on 260 reviews
Total 5 star reviews: 219 Total 4 star reviews: 21 Total 3 star reviews: 8 Total 2 star reviews: 5 Total 1 star reviews: 7
92%would recommend this product
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260 reviews
  • CW
    Cynthia W.
    Verified Buyer
    I recommend this product
    Age Range 65+
    Pros Exceeds Expectations
    Rated 5 out of 5 stars
    4 months ago
    This unique product is awesome

    I’ve been using this probiotic for past 2 +years and really love how it conditions my bare nails. I remove any polish on my nails and use this between salon manicures. It gives my nails a chance to breathe and recover from polish. Prior to applying the Probiotic Instant Boost, I apply the Fresh Glow Cuticle Remover followed by Nourishing Cuticle Oil. Taking time to gently use my fingers to work each product in. Then I apply the probiotic and after a few minutes I use my fingers to rub t it in. Photo below shows finished product. I have purchased the probiotic for a friend and she loves it. I am 70 years young and a long time fan of Londontown products and recommend each and every product.

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    L Profile picture for LONDONTOWN
    LONDONTOWN
    4 months ago

    Thank you so much for sharing your wonderful experience with our Nail Probiotic Instant Boost, Cynthia! We're thrilled to hear how well it's been working for you over the past two years. It’s fantastic that you’ve found such a great routine using our products, and it’s great to know that your nails are breathing and recovering with the help of Nail Probiotic Instant Boost and the cuticle care products.

    We’re also so happy to hear you’ve introduced it to a friend who loves it too! Your continued support and trust in Londontown mean the world to us, and we appreciate your kind words. We hope your nails keep looking and feeling amazing for years to come! 💅😊

  • LC
    Laura C.
    Verified Buyer
    I recommend this product
    Age Range 55 - 64
    Pros Smells Great, Gentle, Conditions, Performs as Described, Exceeds Expectations
    Rated 5 out of 5 stars
    1 year ago
    Much improved cuticles!

    This - in combination with switching to a mild bar soap for hand washing (no SLS) - has saved my cuticles! They were wretched in appearance before I began using this. Cannot recommend highly enough.

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  • LV
    Lisette van R.
    Verified Buyer
    I recommend this product
    Age Range 65+
    Pros Conditions, Would Purchase Again, Performs as Described, Gentle, Exceeds Expectations
    Rated 5 out of 5 stars
    1 year ago
    From bitten to beautiful

    I have bitten my nails for most of my life. As a child, young adult through to my senior years. I am 74 years old.

    I decided to break that habit and let my nails grow. It was difficult but I did it! However, my nails were not healthy. They broke, split, peeled and always had rough edges and weak spots. Then

    Londontown came into my life!

    After using Nail Probiotic Instant Boost for one month my nails began to improve. Then I decided nail care was my next step to beautiful nails. I purchased and started using Illuminating Nail Concealer, Perfecting Nail Veil #4 and Gel Genius Top Coat. WOW!! I now have beautiful, strong nails. I am thrilled!!

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  • DJ Profile picture for Debra J.
    Debra J.
    Verified Buyer
    I recommend this product
    Age Range 55 - 64
    Pros Conditions, Performs as Described, Would Purchase Again
    Rated 5 out of 5 stars
    1 year ago
    Amazing!

    Since using this product my nails are so healthy. As are my cuticles. I love it.

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  • KG Profile picture for Kathy G.
    Kathy G.
    Verified Buyer
    I recommend this product
    Age Range 65+
    Pros Conditions, Performs as Described, Exceeds Expectations, Would Purchase Again, Gentle
    Rated 5 out of 5 stars
    1 year ago
    I Don’t Have Words

    My nails had started peeling at the tips a year ago I was wearing gel Polish and truthfully I didn’t remove it properly. So after that abuse I stopped and my nails were in bad shape. They were very dry and had some ridges and were peeling and I’ve even had a couple of nails split or crack from the tip down to the skin. My cuticles were dry and splitting as well. So I tried this to see if it could helps. I applied it just like the directions said to clean dry nails. I can’t explain it. All I can say is it worked‼️The dry brittle look was gone.I put it on my cuticles too and rubbed it in my nail beds and cuticles and my nails look and feel nice. They seem stronger too. I think this stuff really works. I also applied the veil polish and I think very nice neat and clean. I really like it and suggest you try it if your nails are in bad shape. I’m sold.

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