Koji White Underarm Serum for Underarms, Elbows & Knees — 1 fl oz | Kojic Acid & Niacinamide, Fast-Absorbing Hydration

Koji White Underarm Serum is a lightweight, fragrance-free treatment designed to hydrate and visually improve underarms, elbows, knees and private areas using kojic acid, niacinamide, and tranexamic acid.

This fast-absorbing serum targets areas prone to friction and discoloration with a non-sticky formula that supports smoother, softer skin. Formulated without parabens, alcohol, or phthalates, the product includes prebiotics to help maintain a balanced underarm environment while key actives work to even tone and improve the look of dull patches. Designed for daily use after cleansing, it’s suitable for anyone seeking a gentle, cosmetic approach to rough or marked skin.

How does this serum address underarm marks and dullness?

The combination of kojic acid and tranexamic acid helps reduce the visual appearance of hyperpigmentation and dark spots by targeting excess melanin formation and promoting a more uniform tone. Niacinamide adds skin-strengthening benefits, supporting barrier resilience and improved texture without heavy occlusion. Results depend on consistent use and sun protection for treated areas.

• Kojic acid: helps lighten visible dark patches over time.
• Tranexamic acid: supports reduction of stubborn discoloration.
• Niacinamide: improves hydration and surface texture.
• Prebiotics: encourage a balanced underarm microbiome and odor control.

Will the serum feel sticky or interfere with deodorant?

This formula is intentionally lightweight and fast-absorbing, designed to leave minimal residue so it won’t feel tacky under clothing. Because it’s fragrance-free, it layers well with most deodorants and antiperspirants once fully absorbed. For best performance, allow a minute after application before putting on deodorant.

• Fast-drying, non-greasy texture for comfortable wear.
• Fragrance-free to avoid scent clashes with deodorants.
• Works on damp skin for quicker absorption post-shower.

How should I use Koji White Underarm Serum for best results?

Apply the serum to clean, damp skin and massage gently until fully absorbed, ideally after showering when pores are open. Consistent daily use is recommended; visible improvement typically appears with regular application over several weeks. If you have sensitive skin, test a small area first or consult a skincare professional for personalized advice.

• Use daily on washed, damp underarms, elbows, knees, or intimate areas.
• Massage until the serum fully absorbs; allow brief drying time before dressing.
• Pair with sunscreen on exposed areas to protect treated skin from UV-induced darkening.

Is this product safe for sensitive skin and ethical concerns?

Koji White Underarm Serum avoids alcohol, parabens, and phthalates, and it’s vegan and cruelty-free—formulation choices that reduce common irritation risks. Still, actives like kojic acid can be sensitizing for some; patch testing is recommended. The brand also favors sustainably sourced packaging to lower environmental impact.

• Paraben-free, phthalate-free, and alcohol-free to minimize irritants.
• Vegan-friendly and not tested on animals for ethical assurance.
• Sustainably minded packaging choices where possible.

Who this is for: Koji White Underarm Serum is ideal for people who want a lightweight cosmetic solution to visible underarm or friction-area discoloration without heavy creams or added fragrances. It suits users looking to hydrate, smooth rough texture, and reduce the look of dark spots on underarms, elbows, knees, and intimate zones—especially those who prefer vegan, cruelty-free skincare. If you have very reactive skin or are treating with prescription products, consult a dermatologist before introducing new active ingredients.

Ingredients

Water (Aqua), 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