DEFENCE_DAY_SERUM_30ML
Smart Shield Cellular Reset

Defence Day Serum

Antioxidant Defence Serum | Cellular Energy Support

4.93  -  42 reviews

Daily antioxidant defence against light-induced skin ageing.

A lightweight, high-performance serum designed to defend skin from daily light exposure, oxidative stress and urban aggressors, complementing the protective performance of your face sunscreen. 

30ml
  • Visible radiance from first application
  • +41.1% more even skin tone (4 weeks)
  • +30.7% smoother, more refined skin (4 weeks)
Complete results

HYDRATION
Significant hydration boost lasting up to 8 hours after a single application.
30 min: +88.9% hydration vs control
2 h: +64.5% hydration vs control
8 h: +38.0% hydration vs control
*In vivo clinical study on 10 subjects, instrumental measurements by corneometry.

IMMEDIATE GLOW
The complexion reveals enhanced radiance, clarity and translucency for up to 8 hours after a single application.
+45.6% more radiant complexion
+37.8% clearer complexion
+25.6% more glow
*In vivo clinical study on 30 subjects after 8 hours of application

LONG-TERM BENEFITS
The complexion reveals enhanced radiance, clarity, translucency and evenness, while the skin appears more hydrated, plumper and smoother. Clinically proven improvements after 28 days.

+34.1% more radiant complexion
+25.9% clearer complexion
+27.3% more translucent complexion

+41.1% more even skin tone
+34.1% visibly more hydrated and plumper skin
+30.7% smoother skin texture
*In vivo clinical study on 30 subjects after 4 weeks of application

SENSORY & TEXTURE
100% – Easy and smooth application
94% – The texture is pleasant and sensorial
88% – Fast absorption into the skin
84% – The product does not leave the skin sticky
81% – Provides an immediate sensation of freshness
*In vivo clinical study on 30 subjects after 4 weeks of application

SKIN COMFORT
100% – Skin feels soft to the touch
97% – The product is perfectly suitable for the skin type
91% – Skin feels intensely hydrated
*In vivo clinical study on 30 subjects after 4 weeks of application

URBAN DEFENCE & PROTECTIVE SHIELD
75% – Skin feels better defended throughout the day
72% – Skin feels more resistant to daily environmental stress
72% – Complexion does not look dull even at the end of the day
*In vivo clinical study on 30 subjects after 4 weeks of application
Packshot Lumi-Shield Daily Fluid 50ml
Lumi-Shield Daily Fluid

SMART UV SPF 50 | PA++++

39,00 €

<p><span class="metafield-multi_line_text_field">MADE IN FRANCE</span></p>

MADE IN FRANCE

<p><span class="metafield-multi_line_text_field">DERMATOLOGICALLY TESTED</span></p>

DERMATOLOGICALLY TESTED

<p><span class="metafield-multi_line_text_field">FRAGRANCE FREE</span></p>

FRAGRANCE FREE

<p><span class="metafield-multi_line_text_field">VEGAN FORMULA</span></p>

VEGAN FORMULA
Professeur Passeron Advice Image

About the product

Day Serum Defence

Product details

Defend your skin. Reveal your glow.

Light exposure doesn't stop at UV. Blue light, pollution and oxidative stress continue to impact skin throughout the day, accelerating skin ageing, weakening the barrier and reducing natural cellular energy.

Powered by light-activated DNA repair enzymes and the PQQ CellPower Technology™, Day Serum Defence acts as your skin's daily antioxidant shield, helping to neutralise oxidative stress while reinforcing skin resilience in real time. It boosts the skin’s natural defence systems during the day, helping reduce the visible and cellular signs of photoageing.

Why you'll love it:

  • Light-weight gel texture
  • No sticky residue, quick absorbing
  • Instant skin luminosity and skin barrier support
  • Tested on all skin types, including sensitive
  • Dermatologically tested
  • Fragrance free
  • Vegan formula
  • Made in France
How to use

Apply in the morning to a cleansed face and neck. Pair with the Lumi-Shield Daily Fluid for boosted protection.

Ingredients

  • Bioinspired antioxidant

    Defends skin against photo-oxidative stress.

  • Light-adaptive blue microalgae

    Helps repair light-induced cellular damage.

  • Iris root extract

    Improves radiance and supports skin firmness.

All ingredients

AQUA (WATER), BUTYLENE GLYCOL, GLYCERIN, DIBUTYL ADIPATE, DIGLYCERIN, PENTYLENE GLYCOL, 1,2-HEXANEDIOL, AMMONIUM ACRYLOYLDIMETHYLTAURATE/VP COPOLYMER, METHOXYPHENYLETHENYL T-BUTYLBENZOATE, XANTHAN GUM, SUCROSE, IRIS PALLIDA ROOT EXTRACT, O-CYMEN-5-OL, SPIRULINA MAXIMA EXTRACT, LECITHIN, CARNITINE, DIMETHYLMETHOXY CHROMANOL, NIACINAMIDE, CITRIC ACID, PYRROLOQUINOLINE QUINONE, PHENOXYETHANOL, ETHYLHEXYLGLYCERIN
The dermatologist advice

“During the day, skin is in defense mode.
Environmental stress increases oxidative pressure, which impacts mitochondrial efficiency and accelerates visible ageing.
Applying Sunlution's Day Serum Defence each morning helps supporting cellular energy and strengthen your skin’s long-term resistance.”


Clinically proven results

Results you can see

Clinically proven after 28 days, this serum resets skin vitality to counteract daily light stress. Results show a visible improvement in skin smoothness, plumpness, and radiance.

  • +41.1%

    more even skin tone

  • +30.7%

    smoother skin texture

  • +34.1%

    visibly more hydrated and plumper skin

Complete results

HYDRATION
Significant hydration boost lasting up to 8 hours after a single application.
30 min: +88.9% hydration vs control
2 h: +64.5% hydration vs control
8 h: +38.0% hydration vs control
*In vivo clinical study on 10 subjects, instrumental measurements by corneometry.

IMMEDIATE GLOW
The complexion reveals enhanced radiance, clarity and translucency for up to 8 hours after a single application.
+45.6% more radiant complexion
+37.8% clearer complexion
+25.6% more glow
*In vivo clinical study on 30 subjects after 8 hours of application

LONG-TERM BENEFITS
The complexion reveals enhanced radiance, clarity, translucency and evenness, while the skin appears more hydrated, plumper and smoother. Clinically proven improvements after 28 days.

+34.1% more radiant complexion
+25.9% clearer complexion
+27.3% more translucent complexion

+41.1% more even skin tone
+34.1% visibly more hydrated and plumper skin
+30.7% smoother skin texture
*In vivo clinical study on 30 subjects after 4 weeks of application

SENSORY & TEXTURE
100% – Easy and smooth application
94% – The texture is pleasant and sensorial
88% – Fast absorption into the skin
84% – The product does not leave the skin sticky
81% – Provides an immediate sensation of freshness
*In vivo clinical study on 30 subjects after 4 weeks of application

SKIN COMFORT
100% – Skin feels soft to the touch
97% – The product is perfectly suitable for the skin type
91% – Skin feels intensely hydrated
*In vivo clinical study on 30 subjects after 4 weeks of application

URBAN DEFENCE & PROTECTIVE SHIELD
75% – Skin feels better defended throughout the day
72% – Skin feels more resistant to daily environmental stress
72% – Complexion does not look dull even at the end of the day
*In vivo clinical study on 30 subjects after 4 weeks of application
Before
After 28 days
Before
After 28 days
Before
After
Before
After

Clinical & technology results

Boosted cellular energy

PQQ CellPower Technology™ helps boost cellular energy and strengthen antioxidant defence, supporting the skin’s ability to recover from daily stress. It contributes to improved cellular function and more resilient, visibly revitalised skin over time.

  • Image 1: Red fluorescence indicates higher mitochondrial membrane potential; the brighter the red, the healthier the mitochondria. Green fluorescence indicates lower membrane potential; less green reflects reduced mitochondrial stress and a healthier state.
  • Image 2: Brighter red fluorescence indicates more active mitochondria.
Methods

Study context data shown are derived from in vitro studies under controlled laboratory conditions. Results may vary depending on individual skin conditions and product use.

The science

Cellular energy support

<span class="metafield-multi_line_text_field">PQQ CellPower Technology™</span>
PQQ CellPower Technology™

PQQ CellPower Technology™ targets the mitochondria, the structures responsible for cellular energy production.
Powered by PQQ, it helps support cellular energy and reduce oxidative stress linked to environmental exposure.

Learn more

Expert Answers from Dermatologist

Thierry Passeron,
MD, PHD
Sunlution’s founder

What is PQQ and how does it work on my skin?

PQQ (Pyrroloquinoline Quinone) is an advanced antioxidant that supports mitochondrial function (the energy source of skin cells). By helping maintain cellular energy, it supports the skin's natural repair processes, strengthens its defence against oxidative stress and contributes to long-term skin resilience. Click here, for a deeper explanation of the science behind PQQ and cellular energy.

Can I use Day Serum Defence with other products containing actives?

Yes. Day Serum Defence is designed to work alongside other skincare products. The formula combines multiple complementary actives at balanced levels, rather than relying on very high concentrations of a single ingredient. This approach helps support skin defence and resilience while remaining suitable for layering within a daily skincare routine.

Is the Day Serum Defence safe for senstive skin?

Day Serum Defence has been formulated with carefully selected actives and a lightweight texture designed to be gentle on the skin. The formula is clinically tested and suitable for most skin types, including sensitive skin. As with any active skincare product, we recommend introducing it gradually into your routine and performing a patch test if your skin is particularly reactive.

When in my routine should I use Day Serum Defence?

Apply Day Serum Defence to clean, dry skin after cleansing. Its lightweight texture absorbs quickly, making it an ideal first-treatment step in your routine. Follow with your moisturiser and in the morning finish with Lumi-Shield Daily Fluid for optimal daily light protection.

What is an antioxidant and how does it help against photoageing?

Antioxidants help neutralise free radicals generated by UV light and other environmental stressors such as pollution and visible light. These unstable molecules can trigger oxidative reactions that damage skin cells, weaken collagen and accelerate visible signs of ageing. By helping to neutralise these reactions, antioxidants support healthier, more resilient skin over time.

How does the Day Serum Defence work with Lumi-Shield Daily Fluid to protect my skin?

While sunscreen helps shield the skin from UV rays, oxidative stress can still occur from daily environmental exposure. Day Serum Defence delivers antioxidants and cellular-supporting actives that help neutralise this stress and support the skin's natural defence systems. Used together, they create a complementary protection strategy: shielding the skin from light exposure while helping it defend and recover from daily environmental aggressors.

Discover the routine