Koji White

Bright Booster Underarm Serum

Deliver to 07008

Concerned about dark underarms, uneven tone, or rough texture? This lightweight underarm serum is designed to help improve the look of smoother, more even-looking skin.

Formulated with Kojic Acid, Niacinamide, and Tranexamic Acid, this targeted treatment helps improve the appearance of dark underarms while supporting a more balanced skin tone.

The fast-absorbing, non-sticky formula works gently on delicate underarm skin, helping to refine texture, reduce the look of discoloration, and keep skin feeling hydrated and comfortable.

Perfect for daily use, especially after shaving or waxing.

Key Benefits:

  • Helps improve the appearance of dark underarms
  • Supports more even-looking skin tone
  • Lightweight, fast-absorbing texture
  • Non-sticky, suitable for daily use
  • Helps smooth and soften underarm skin

Designed for delicate underarm skin that needs gentle yet effective care.

Not Tested on Animals  No Paraben No SLS Vegan
Bright Booster Underarm Serum
$19.95
Visible Results in 4 WeeksMade from Vegetable GlycerinDermatologist-TestedPETA CERTIFIED

Trusted By

Looking for a soap that contains kojic acid? Check out the Koji White soap two-pack that provides a multitasking cleanse to remove dirt and grease while also leaving your skin feeling moisturized.

If aging skin is a concern for you, look no further than Koji White's Skin Brightening Body Wash. While this brand offers a wide array of kojic acid-based products, this one contains moisturizing heros such as vitamins E and B5.

If you’re searching for a kojic acid soap to use on your face, try this top-rated pick from Koji White, which comes in a pack of two bars and currently has over 14,000 five-star ratings from Amazon shoppers

Made with hyaluronic acid and coconut oil, this bar soap is formulated to help brighten, hydrate and nourish your skin. It can be used on both face and body and each box comes with two bars, perfect for leaving one in the shower and one at the sink.

50,000+ Reviews From happy Amazon customers

REAL RESULTS, REAL CUSTOMERS
@iarekitteh ⭐⭐⭐⭐⭐Verified Purchase

Left is Before. Right is After. I really was not expecting to review this product so soon after getting it. But, here I am. I have been using it every morning.

Maria T. Castillo ⭐⭐⭐⭐⭐Verified Purchase

Sí funciona, y lo estoy complementando con Black and white bleaching cream

Hopeful123 ⭐⭐⭐⭐⭐Verified Purchase

I LOVE this soap! It smells great and is very gentle (which I worried about because of such a refreshing citrus smell), but most importantly it WORKS!

Shae ⭐⭐⭐⭐⭐Verified Purchase

Slow progress but progress. Top pics February; bottom pic July PS I know I have big hands which means I will knock your are into next week if you play

Product Description

1. Cleanse your underarms: Before applying the serum, make sure your underarms are clean and dry to allow better absorption.

2. Dispense the serum: Squeeze a small amount of serum onto your fingertip.

3. Apply to underarms: Gently apply the serum directly to both underarms, focusing on areas with dark spots or uneven tone.

4. Massage gently: Use your fingers to softly massage the serum into the skin until fully absorbed.

5. Let it absorb: Allow the serum to fully absorb before applying deodorant or getting dressed.

Koji White Better Together:
Before showering, use Koji White Bump & Body Scrub Skin Brightening Soap to brighten and moisturize your skin for a smooth, radiant glow.

Aqua/Water/Eau, Niacinamide, Butylene Glycol, Glycereth-26, Tranexamic Acid, Phenoxyethanol, Potassium Methoxysalicylate, Carbomer, Alpha-Glucan Oligosaccharide, Chlorphenesin, Ethoxydiglycol, Tetrasodium EDTA, Glycerin, Sodium Lactate, Methylpropanediol, Kojic Acid, Lens Esculenta (Lentil) Seed Extract, Enantia Chlorantha Bark Extract, Saccharomyces/Persimmon Fruit Juice Ferment Extract, Ananas Sativus (Pineapple) Fruit Extract, Carica Papaya (Papaya) Fruit Extract, Mangifera Indica (Mango) Fruit Extract, Silanediol Salicylate, Ethylhexylglycerin, Oleanolic Acid

We are proud to partner with Amazon MCF to provide fast and dependable delivery across the USA. Orders are typically shipped within 24 business hours, with an estimated standard delivery timeframe of 3–5 business days.

Tracking is included with every order—you will receive a shipping confirmation email with a tracking link to monitor your delivery status in real-time.

Better skin in 30 days or it's FREE!

We want you to feel confident and happy with your skincare journey. If you are unsatisfied with your results within 30 days, please reach out to our team at info@kojiwhite.com with your order details.

Due to safety and hygiene standards, we do not accept physical returns of used personal care products. However, we are happy to review your experience and issue a refund for eligible purchases. Terms and conditions apply—please read our full Return Policy for more details.

The Koji White Difference

I haven’t experienced any itchiness or allergic reactions. My skin already feels softer. Although the picture shows a visible before-and-after light effect, I think the difference is mostly due to lighting. I’ll continue using it because I like the ingredients it contains because I’m hoping to see more noticeable light skin over time.

I haven’t experienced any itchiness or allergic reactions. My skin already feels softer. Although the picture shows a visible before-and-after light effect, I think the difference is mostly due to lighting. I’ll continue using it because I like the ingredients it contains because I’m hoping to see more noticeable light skin over time.

BU
An excellent addition to my routine. It hasn't caused any irritation or redness, and my underarm skin feels noticeably softer. The before and after photo shows a nice brightening effect—even though lighting plays a part, the actual texture and tone improvement is there. It can be slightly drying, so just make sure to pair it with a good moisturizer or deodorant after it absorbs.

An excellent addition to my routine. It hasn't caused any irritation or redness, and my underarm skin feels noticeably softer. The before and after photo shows a nice brightening effect—even though lighting plays a part, the actual texture and tone improvement is there. It can be slightly drying, so just make sure to pair it with a good moisturizer or deodorant after it absorbs.

Our Promise

Better skin in 30 days or it's FREE

If you are unhappy with any of our products we offer a 30-day money back guarantee.

Our story

"Brighten your skin, Brighten your day"

Most women feel insecure about their appearance. At Koji White, we create products that reduce melanin production to brighten your skin, so you’ll fall in love with yourself every day.

Ingredients

Infused with Plant-Based Ingredients: Aqua / Water / Eau, Glycerin, Alpha-Glucan Oligosaccharide, Kojic Acid, Lens Esculenta (Lentil) Seed Extract, Enantia Chlorantha Bark Extract, Saccharomyces/Persimmon Ferment, Ananas Sativus (Pineapple) Fruit Extract, Carica Papaya (Papaya) Fruit Extract, Mangifera Indica (Mango) Fruit Extract, Oleanolic Acid

Kojic Acid

Helps visibly brighten the underarm area by reducing the look of dark spots and uneven tone.

Lens Esculenta (Lentil) Seed Extract

Helps minimize the appearance of pores and smooth skin texture by supporting sebum regulation and hydration balance.

Enantia Chlorantha Bark Extract

A natural botanical known to help reduce excess oil and improve skin clarity, ideal for sensitive or sweat-prone areas.

Ingredient Blacklist

THESE INGREDIENTS WILL NEVER BE INCLUDED IN ANY Koji White PRODUCTS

Acetaldehyde, Acetonitrile, Acetone, Acrylamide & Polyacrylamide, Acrylates, Acrylates, Aluminum Salts, Benzophenones and related compounds, Benzalkonium chloride, Bisphenol A (BPA), Butoxyethanol, Butylated hydroxyanisole (BHA),Coal Tar, Ethanolamines, Ethylene Oxide, Formaldehyde, Formaldehyde Releasing Agents, Hydroquinone, Lead and Lead Acetate, Mercury + Mercury Compounds (Thimerisol), Methoxyethanol or Methyl Cellosolve, Methylene chloride, Methylchloroisothiazolinone and Methylisothiazolinone, Parabens, Phthalates, Resorcinol, Retinyl Palmitate, Styrene, Sulfates, Talc, Toluene, Triclosan and Triclocarban, Synthetic Fragrance, 1&4 Dioxane, Octinoxate, PFAS compounds, Nitromusks and Polycyclic Musks,Cyclic Silicones, Benzene, Octocrylene, Other heavy metals, Fragrance, Nanomaterials, Butylated hydroxytoluene (BHT), Carbon Black or Black 2 (nanomaterial), Mineral Oil and derivatives

FAQs

What does the Bright Booster Underarm Serum do?

This serum is designed to brighten dark underarms and other sensitive areas using a powerful blend of Kojic Acid, Niacinamide, and Tranexamic Acid. It helps reduce discoloration, smoothen texture, and restore even skin tone.

Is it safe for daily use?

Yes, it is safe for everyday use. The formula is fragrance-free, gentle, and absorbs quickly without leaving residue—ideal for even sensitive skin.

Can I apply it right after shaving or waxing?

No. It is recommended to wait 6–12 hours after shaving or waxing before applying the serum, to prevent irritation or sensitivity.

How long does it take to see visible results?

Users typically begin to notice improvement in 2–3 weeks, with more visible and even tone results showing after 6–8 weeks of continuous daily use.

Can I use it on areas other than underarms?

Yes! This serum is suitable for inner thighs, elbows, knees, and other friction-prone areas with darkened or rough skin.

Does it control odor or sweat?

No, this product is not a deodorant or antiperspirant. It is a brightening treatment serum only. You may use a deodorant afterward if needed.

Can I layer it with other Koji White products?

Yes! You may pair it with Koji White soaps, body lotions, or serums. If you have sensitive skin, avoid overlapping too many actives on the same area at once.

Does it leave a sticky or greasy feel?

Not at all. It has a lightweight, water-based texture that absorbs fast and leaves your skin smooth and fresh.

Customer Reviews

Overall rating: 5.0 / 5 from 14 reviews.

I am very happy with this product. I had a delivery issue on my original order and they worked and resolved the issue right away. I been using the product for 2 weeks now and I can see a difference already. I'm super excited and happy to see the results. I definitely recommend the products.

Bright Booster Underarm Serum

This serum is so easy to add to my skincare routine. It dries fast, has a pleasant scent, and doesn't irritate my skin even after shaving. After a few weeks, my underarms look more even

Bright Booster Underarm Serum

Store owner replied: Hey, We're so pleased to hear such wonderful feedback about your experience with our Bright Booster Underarm Serum. It's fantastic to know that you find it easy to incorporate into your skincare routine, appreciate its fast-drying nature and pleasant scent, and especially that it's gentle on your skin even after shaving. We're thrilled that you've seen such positive results with your underarms looking more even after just a few weeks. Your detailed review truly highlights the benefits we strive to deliver with our products and helps others discover their potential. Thanks again for your kind words and we hope to continue being a part of your skincare journey.

The texture is lightweight and non-greasy, making it comfortable to wear every day. My underarms feel hydrated, and I've noticed less roughness and a more even skin tone. Very happy with the results!

Bright Booster Underarm Serum

The texture is lightweight, the fragrance is gentle, and it doesn't irritate my sensitive skin. My underarms look more even-toned, and I've noticed less roughness after daily use. Highly recommend!

Bright Booster Underarm Serum

I've tried several products for dark underarms, but this one has given me the best results so far. My skin feels hydrated, smoother, and the appearance of discoloration has gradually improved. A little goes a long way, so the bottle lasts quite a while.

Bright Booster Underarm Serum

Lightweight & Easy to Use I love how lightweight this serum is. It layers well under deodorant, and after a few weeks my underarms look brighter and feel much softer. Definitely keeping this in my daily routine.

Bright Booster Underarm Serum

Noticeably Smoother & Brighter I've been using this every night after showering, and my underarms already look smoother and more even. The serum absorbs quickly and doesn't leave any sticky feeling.

Bright Booster Underarm Serum

Gentle and effective I have sensitive skin, so I was worried at first, but this serum didn't cause any irritation. It keeps my underarms hydrated and I've noticed my dark spots are gradually fading. It layers well with my deodorant and has become part of my daily routine. Highly recommend!

Bright Booster Underarm Serum

Really helped brighten my underarms I've been using this serum every night for about 3 weeks, and I can definitely see a difference. My underarms look brighter and feel smoother. The texture is lightweight, absorbs quickly, and doesn't leave any sticky feeling. I'll definitely keep using it!

Bright Booster Underarm Serum

Amazing formula, very gentle on sensitive skin! What drew me to the Koji White Underarm Serum was the ingredient list. It’s packed with proven brighteners like Kojic Acid, Niacinamide, and Tranexamic Acid, but it doesn't contain any harsh chemicals or parabens. As someone with sensitive skin, I was worried it might cause irritation, but it has been incredibly gentle. It has a water-based texture that hydrates the skin beautifully while working to even out the skin tone. I've noticed a visible improvement in both the discoloration and the "chicken skin" texture under my arms. Plus, knowing it's 100% vegan and cruelty-free makes me love it even more. Highly recommend giving this a try if you want to boost your underarm confidence!

Bright Booster Underarm Serum

Store owner replied: Hey, We are absolutely delighted to read your fantastic review of our Bright Booster Underarm Serum! It's wonderful to hear how much you appreciate the thoughtful blend of ingredients like Kojic Acid, Niacinamide, and Tranexamic Acid, and that its gentle, water-based formula has worked so beautifully for your sensitive skin. We're thrilled that you've experienced such a visible improvement in both discoloration and skin texture, ultimately boosting your underarm confidence. Knowing that our commitment to being 100% vegan and cruelty-free resonates with you makes this feedback even more special. Your positive experience truly validates our dedication to crafting effective and kind-to-skin solutions, and we are so glad the Bright Booster Underarm Serum delivered on its promise. Thanks again for sharing your journey with Koji White, and we hope you continue to enjoy our products.

Enthusiastic & Highly Recommended I’ve been using the Koji White Bright Booster Underarm Serum for a few weeks now, and I am absolutely loving the results. I’ve always struggled with dark underarms and rough skin from years of shaving, but this serum has completely turned things around. The best part about it is the texture—it’s incredibly lightweight and absorbs into the skin almost instantly. Unlike other underarm creams I’ve tried in the past, this one leaves zero sticky residue, so I can put my clothes on right away without worrying about stains. It feels so gentle and hydrating, even when applied right after shaving. My underarms look noticeably brighter and feel much smoother. Will definitely repurchase!

Bright Booster Underarm Serum