Grey, dull tone, stubborn discoloration and fine lines starting to show — when your routine can't keep up with how fast skin loses its glow, one concentrated serum is often more effective than adding extra steps. This brightening serum from Polish brand Bielenda's Good Skin Glow Boost line contains up to 6.5% carefully selected active ingredients, combining glycolic acid, a vitamin C derivative and ferulic acid to target dullness, uneven tone and early signs of ageing.
Why does this serum work on dullness and discoloration? Glycolic acid is a small-molecule AHA that gently clears away dead surface cells, evening tone and smoothing texture, while supporting the skin's collagen production to delay premature signs of ageing. The vitamin C derivative 3-O-Ethyl Ascorbic Acid is a highly stable, powerful antioxidant that, with regular use, helps brighten the complexion, fade discoloration, fight fine lines and firm the skin. Ferulic acid shows strong tone-evening properties, targets sun-related pigmentation and helps soothe the skin. Working together at serum-level concentration, the trio brightens, smooths lines and helps improve the look of imperfections in one step. Panthenol is added to hydrate and comfort, balancing the sensation of the acids.
This serum is fragrance-free — its scent comes from the ingredients themselves, ideal for those who prefer skincare without added perfume. The lightweight texture spreads easily; a few drops cover the face, neck and décolleté. A slight tingling after application is normal for acid-based skincare. In apparatus testing, using this serum together with the tonic and cream from the same line for 7 days improved skin hydration by 23%, with measurable brightening of skin tone and discoloration.
It also adapts across climates. In hot, humid tropical climates, the light texture feels weightless for evening use. In dry continental climates or long hours of air-conditioning, glycolic acid lifts away the rough, dulling build-up while panthenol replenishes moisture. In temperate climates with distinct seasons, autumn and winter — when sunlight is weaker — are an ideal window for focused acid-based brightening care. Wherever you are, always apply sunscreen during the day to protect your results.
Suitable Skin Types：
Suitable for normal, combination and oily skin
Grey, dull skin lacking radiance
Skin with discoloration or uneven tone
Skin with early fine lines or first signs of ageing
Skin troubled by imperfections or rough, uneven texture
Suitable for those in long-term air-conditioned environments or whose skin looks tired from irregular routines
Not Suitable For：
Those sensitive to glycolic acid or other exfoliating acids
Those with a damaged skin barrier or skin in a highly sensitive, reactive state
Those with wounds or actively inflamed skin on the face
Couperose skin with visible capillaries (the brand recommends spot application on discoloration only, not full-face use)
Those already using high-strength acids or retinol should avoid layering or seek professional advice first
Key Features：
- Up to 6.5% active ingredients: a concentrated serum where glycolic acid, a vitamin C derivative and ferulic acid work at effective levels to tackle dullness and uneven tone
- Brightens and smooths lines: evens tone and fades discoloration while fighting fine lines, early signs of ageing and the look of imperfections
- Fragrance-free formula: no added perfume, its scent comes from the ingredients themselves, reducing unnecessary irritants
- Apparatus-tested results: used with the tonic and cream from the same line for 7 days, skin hydration improved by 23%, with brightening of tone and discoloration
- Flexible use: works on its own or as a base under the Glow Boost cream from the same line
Key Ingredients：
- Glycolic Acid: a small-molecule AHA that gently speeds up the removal of dead surface cells, evens tone, smooths texture and supports the skin's collagen production to delay premature signs of ageing
- Vitamin C Derivative (3-O-Ethyl Ascorbic Acid): a stable form of vitamin C and powerful antioxidant that, with regular use, helps brighten the complexion, fade discoloration, fight fine lines and leave skin firmer and more luminous
- Ferulic Acid: a plant-derived antioxidant with strong tone-evening properties, targeting sun-related pigmentation while helping to fight visible signs of ageing and soothe the skin
- Panthenol: pro-vitamin B5 that hydrates and comforts, balancing the sensation of the acids for a gentler experience
How to Use：
Every evening, massage a few drops of the serum into the cleansed skin of the face, neck and décolleté
Use on its own or as a base for the Glow Boost cream
For couperose skin with visible capillaries, apply in spots on discoloration only
Apply sunscreen during the day
Best used in the evening so the actives can work overnight
Use daily with the tonic and cream from the same line for a more visible 7-day brightening boost
Autumn, winter or seasons with weaker sunlight are an ideal time for focused acid-based care
Tip：
Using this serum with the Glow Boost tonic and cream for 7 consecutive days delivers apparatus-tested, more visible brightening results.
This serum is fragrance-free; any scent you notice comes naturally from the ingredients and is not a sign of spoilage.
Precautions：
A slight tingling sensation after application is normal.
Discontinue use if persistent discomfort or sensitivity occurs.
Avoid direct contact with the eyes.
For couperose skin, the brand recommends spot application only.
Always apply sunscreen during the day when using acid-based products.
Ingredients：
The following ingredients are for reference only; please refer to the ingredient label on the packaging or the official website for accurate information.
Aqua (Water), Glycolic Acid, Sodium Lactate, 3-O-Ethyl Ascorbic Acid, Panthenol, Propanediol, Ferulic Acid, Disodium EDTA, Tetrasodium Glutamate Diacetate, Hydroxyethylcellulose, Disodium Phosphate, Sodium Phosphate, Phenoxyethanol, Ethylhexylglycerin
Directly imported from Poland. Products may have labels in local languages (may not be in English)
Product images and packaging are for reference only. Actual items may vary due to different production batches or countries of origin.
All details on efficacy, usage, ingredients and data come from the brand’s official materials and may change without notice.
Please refer to the original product instructions before use.
Not tested on pregnant women; not labeled as "suitable for pregnancy." Consult your obstetrician if unsure.
Pregnancy may alter skin conditions. Seek medical advice if needed.
Not intended to diagnose, treat, or prevent diseases. Consult a doctor if in doubt.
Product name is sourced from the official website; Chinese name is a temporary translation.
Content described above is temporary and may change anytime by the manufacturer : bielenda.com
