Radiance Booster – 10% Vitamin C

115.00 USD tax incl.

An award-winning booster that illuminates and tones the skin, while reversing photo ageing. A flash of positive energy and freshness!

  • Illuminate, anti-fatigue, tone  
  • Skin-friendly, 100% vegan
  • Made in Switzerland

20 ml / 0.68 oz

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Free shipping to United States in just 3-5 business days direct from Switzerland.

Expected delivery: Apr 24-26

Radiance Booster – 10% Vitamin C

115.00 USD

Visible results for your skin

Swissline’s effective formulas awaken the senses, giving you the relaxation and revitalization you've been longing for.

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How to use

Radiance Booster can be applied am and/or pm as needed, mixed in the palm of the hand with the Recovery Serum to maximize results, or directly in your usual cream for a boost. During the first week, we advise limiting the use to the pm, so as to allow skin to better adapt. 2-3 drops are enough, more can be used if needed. The use of an adapted UV protection during the day is imperative to better protect the skin (and the vitamin C in the formula!).

Is this right for me
Texture: Lightweight gel-serum
Concern: Pigmentation Dull skin
Skin type: All skin types
Scent: Fragrance-free
About the product


An award-winning booster that illuminates and tones the skin, while reversing photo ageing. A flash of positive energy and freshness!

The key ingredient, Stay-C® 50, registered as a quasi-drug in Japan, has been clinically shown to reverse the signs of aging and brighten the skin.

  • Winner of The Best Skin Brightener of the Year, Marie Claire Beauty Awards 2019.
  • Radiance Booster is part of our Age Intelligence collection, winner of the Woman&Home Clever Skincare Awards 2021, One to Watch Category.


  • Results in fresher-looking, vibrant skin.
  • Prolonged use significantly improves the skin’s firmness.
  • Reverses photo-aging at the cellular level while providing a strong anti-oxidant defence.
  • Paraben-free - Allergen-Free - Without Phenoxyethanol - Parfum-Free - Colour-free - Vegan - Cruelty-free

What makes it so effective?

Our award-winning formulas embrace natural actives and skin-identical ingredients that work with your skin, not against it.

STAY-C® 50
STAY-C® 50

Ascorbyl Sodium Phosphate is a more stable form of vitamin C, registered as a quasi-drug in Japan. Recognized as an antioxidant, it illuminates the complexion and reduces the signs of age. Radiance Booster contains also pure L-ascorbic acid – the most active, yet least stable form of vitamin C – together with an ascorbic acid salt form, which greatly contributes to better stability in the very high concentration.

STAY-C® 50 is a registered brand of DSM Nutritional Products AG (DSM Nutritional Products SA /DSM Nutritional Products Ltd), Switzerland. Stated in vivo studies carried out by DSM with a panel of 40 volunteers aged 35-45 years old.

See all ingredients




Water/Eau, Sodium Ascorbyl Phosphate, Glycerin, Butylene Glycol, Ascorbic Acid, Citric Acid, 1,2-Hexanediol, Caprylyl Glycol, PEG-40 Hydrogenated Castor Oil, Xanthan Gum, Disodium EDTA.

Our formulations will be updated from time to time as part of our commitment to innovation, or due to regulatory changes. As such, the ingredient list above may vary from that on the box depending on time and region of purchase.

What makes it so effective?