TOSOWOONG Glutathione Serum 20,000ppm 2.02 fl. oz. — Niacinamide & Hyaluronic Acid for Brightening and Hydration

TOSOWOONG Glutathione Serum is a concentrated Korean skincare formula combining 20,000ppm glutathione with niacinamide and hyaluronic acid to brighten, hydrate, and support smoother-looking skin.

Designed for nightly or daytime layering, this 2.02 fl. oz. serum blends a high-concentration antioxidant with proven hydrators to address uneven tone and surface texture without heavy oils. The formula emphasizes a high-purity glutathione (reported 99% purity) alongside niacinamide to help the complexion appear more even and hyaluronic acid to attract and retain moisture for plumper skin feel.

How does this serum fit into my routine?

Apply after cleansing and toning, before thicker creams or sunscreens, for best absorption. Use a few drops to cover the face and neck; pat gently until fully absorbed. It layers well under moisturizers and makeup when allowed to settle.

• Use morning and/or night after water-based treatments
• Start with 2–3 drops, increase if tolerated
• Follow with moisturizer and SPF in the morning

What active ingredients are in the formula and what do they do?

The serum centers on high-concentration glutathione (20,000ppm) aimed at delivering antioxidant support and helping the skin surface look clearer. Niacinamide helps balance tone and texture while hyaluronic acid supplies multi-depth hydration to reduce the look of fine lines.

• Glutathione (20,000ppm, high purity) for antioxidant support
• Niacinamide to help with visible uneven tone and smoothness
• Hyaluronic acid to attract moisture and improve skin plumpness

Will this product suit sensitive or reactive skin?

The formula avoids heavy oils and is designed for rapid absorption, but high actives can still cause irritation on very reactive skin. Patch-test on the inner forearm for 48 hours before full face use, and introduce gradually—every other day—if you have sensitivity.

• Patch-test to check tolerance before daily use
• If redness or discomfort occurs, discontinue and consult a dermatologist
• Layer with gentle, fragrance-free moisturizers to minimize irritation

How quickly can I expect to notice changes?

Improvements in skin hydration and temporary smoothing can be noticeable within days due to hyaluronic acid. Changes in tone and overall radiance from glutathione and niacinamide usually develop with consistent use over several weeks. Individual results depend on skin type and concurrent products.

• Hydration and smoother texture: days to 2 weeks
• Noticeable tone and radiance shifts: several weeks of regular use
• Best results when used consistently with sun protection

Who is this for: this serum is suited to people seeking a potent, water-based treatment to improve hydration, even out skin tone, and support a more radiant complexion. It fits well into streamlined K‑beauty routines for normal, combination, and oily skin types, and can be introduced cautiously by those with sensitive skin after patch-testing. Ideal for anyone looking for a concentrated antioxidant boost with added niacinamide and hyaluronic acid in a single 2.02 fl. oz. package.

Ingredients

Niacinamide, Glutathione, Adenosine, Glycerin, Coconut Oil, Hyaluronic Acid