Niacinamide Glutathione Serum

Q: Can I use this niacinamide serum with vitamin C products?
A: This serum already contains multiple forms of vitamin C, so additional vitamin C serums are unnecessary and may increase sensitivity risk. Use separately if desired.

Q: Is ONE THING Niacinamide Glutathione Serum suitable for sensitive skin?
A: While niacinamide is generally well-tolerated, those with sensitive skin should patch test first due to the presence of multiple active brightening ingredients.

Q: How does glutathione work in skincare?
A: Glutathione functions as an antioxidant that helps neutralize free radicals and may support a more even skin tone by influencing melanin production pathways.

Q: Can I use this with my retinol or exfoliating acids?
A: Yes, but it's best to use them at different times—apply this serum in the morning and save retinol or acids for your evening routine to minimize potential irritation.

Q: When should I apply this serum in my routine?
A: Apply after cleansing and toning, before heavier serums or moisturizers. The lightweight, watery texture is designed to absorb first and layer easily under other products.

Q: How long until I see results?
A: Most users notice improvements in overall radiance within 2-4 weeks, while visible fading of dark spots typically takes 6-8 weeks of consistent daily use.

Q: Does this serum need to be refrigerated?
A: Refrigeration isn't required, but storing it in a cool, dark place away from direct sunlight will help maintain the stability of the vitamin C ingredients.

Cleanse your face thoroughly and pat dry. Apply toner if using one in your routine. Dispense an appropriate amount of serum onto your fingertips. Gently pat the serum onto your face and neck until fully absorbed. For intensive treatment: soak cotton pads with the serum and apply to areas of concern for 5-10 minutes as a targeted mask. Follow with moisturizer and sunscreen (AM routine).

Purified water, propanediol, butylene glycol, glycerin, niacinamide (50,000 ppm), methylpropanediol, methyl gluceth-20, 1,2-hexanediol, hydroxyacetophenone, trehalose, acrylates/C10-30 alkyl acrylate crosspolymer, glycereth-25 pcai isostearate, tromethamine, ethylhexylglycerin, coptis mimosa root extract, adenosine, citrus fruit peel extract, trisodium ethylenediamine disuccinate, glutathione (100 ppm), 3-O-ethyl ascorbic acid, ascorbic acid, tea tree leaf extract, sodium ascorbyl phosphate, tocopheryl acetate, linoleic acid, oleic acid, palmitic acid, Stearic acid, linolenic acid, tocopherol