Hydration reset for dry, brittle nails
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.
12 ml / .4 fl oz
All Nail Types
THIS PRODUCT IS
KEY INGREDIENTS
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.












Nail Probiotic Instant Boost | Peptide Serum Concentrate | Strengthening Nail Cream | Restorative Nail Cream | ||
|---|---|---|---|---|---|
| FORMAT | Water-gel essence & mask | Ampoule gel-serum | Whitening paste with brush | Fast absorbing cream | Nail & cuticle cream |
| BEST FOR | Dry, dehydrated nails | Stressed cuticles & nails needing and rejuvenation; Gel and nail extension wearers who want to promote nail health | Dull, stained, yellowing nails; Gel and nail extension wearers who want to keep nails ultra clean | Weak, brittle nails needing daily nourishment; Gel and nail extension wearers who want to promote nail strengthening | Dry nails & cuticles damaged from gels or acrylics; Gel and nail extension wearers who want to promote nail nourishment |
| KEY INGREDIENTS | Kefir Probiotic Complex, Gluconolactone, Maltobionic Acid | Cranberry Peptides, Aloe, Glycerin, D-Panthenol | Sodium Carbonate, Calcium Carbonate, Citrus Extract, Florium Complex | Vegan Keratin Complex, Biomimetic Collagen Fragment, Panthenol | Shea Butter, Glycerin, Coconut Oil, Florium Complex |
| HOW TO USE | Massage into bare nails 1-3x per week, as a leave-on mask | Massage into nails & cuticles daily or as needed, especially post-manicure | Brush paste onto nails, then rinse with water | Massage into nails & cuticles daily or as needed, especially post-manicure | Massage into nails & cuticles daily or as needed, especially post-manicure |
| THE RESULT | Instantly hydrated, healthier-looking nails | Rejuvenated, hydrated cuticles and a healthy looking nail | Bright, stain-free nails | Stronger, breakage-resistant nails | Restored, moisturized nails |
| BENEFITS | • Powerful kefir probiotic complex protects nails' natural microbiome • Dual-action exfoliators resurface & brighten dull nails • Antioxidant-rich oil blend deeply replenishes • Restores natural microflora with regular use, even as a quick pick-me-up | • 12% active formula, the brand's highest concentration ever • Cranberry Peptides jumpstart visible rejuvenation • Fortifies nail base to prevent hangnails, peeling & brittleness • Aloe, Glycerin & D-Panthenol instantly hydrate & soothe dryness | • Brightening actives & gentle cleansers lift stains from the whole nail, including the free edge • Included detailer brush reaches every curve and edge • Florium Complex conditions while deep cleaning, so nails never feel dry • Visible brightening after just one use | • Vegan Keratin Complex + Biomimetic Collagen Fragment build & reinforce nail structure • Boosts natural resilience to prevent breakage • Panthenol & Sodium Hyaluronate deeply moisturize nails & cuticles • Encourages stronger, harder, faster nail regrowth | • Restores moisture to nails dry & damaged from gels or acrylics • Fortifies, nourishes & revives even the most brittle nails • Fast-absorbing formula delivers nutrients & botanical extracts for immediate & long-term benefits • Conditions cuticles & boosts resilience for strong, healthy-looking nails |

Reviewed by LONDONTOWN Experts
Hope Auerbach
PRODUCT DEVELOPMENT LEAD
M.S. Cosmetic Science•B.S. Biochemistry
Verified LONDONTOWN Expert
Created with expertise in formulation, ingredients, and cosmetic science.
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.
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! 💅😊
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.
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!!
Since using this product my nails are so healthy. As are my cuticles. I love it.
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.



