CELLULAR HYDRATION SERUM

HYDRATES, REPAIRS, SOOTHES
£52.00 GBP

A serum designed to replenish the skin’s moisture reserves and strengthen its barrier. It delivers lasting hydration, smooths fine lines and helps prevent dullness. The foundation of healthy skin.

  • Multi-level hydration (+26% in 2 hours*).
  • Strengthens the skin barrier and helps prevent moisture loss.
  • Boosts vitamin D receptors.

30 ml

FREE UK delivery
from £45
UK delivery
4–5 days
DESCRIPTION

Why you need this serum:

Because looking good starts with healthy skin. Hydration is the foundation of a radiant complexion, but when skin is dehydrated, the barrier weakens, fine lines deepen, and your glow fades. This serum restores hydration and strengthens skin resilience, keeping your complexion smooth, plump, and naturally luminous.

Why this serum is different:

  • Optimal Hydration: Combining a perfectly calibrated dose of hyaluronic acid with magnesium synergistically boost skin hydration and resilience, effectively minimising fine lines and wrinkles.
  • Skin Barrier Defence: Enriched with probiotics, prebiotics, and a patented vitamin D-like compound, this unique blend rejuvenates, strengthens, and repairs the skin barrier, fortifying its natural defences.
  • Antioxidant Benefits: While protecting against oxidative stress, regular use helps prevents premature skin ageing, promoting a healthier, more resilient complexion.
  • Premature Skin Ageing Benefits: Regular use helps prevent premature ageing, promoting a healthier, more resilient complexion.

Bonus: 

A booster of Vitamin D Receptors (VDRs). VDRs help your skin absorb and utilize vitamin D3, which is essential for skin renewal and defence. Higher VDR activity means better vitamin D metabolism, improved collagen production, and stronger skin resilience, even with less sun exposure. This serum boosts VDR activation, helping your skin stay firm, healthy, and radiant.

  • For all skin types, all genders, all ages. 
  • Safe for sensitive skin & reactive skins. 
  • Light gel texture & non-sticky, perfect for indulgent facial massages.
  • 99.8% natural.
  • Tested free of oestrogenic endocrine disruption.
  • Safe for women who are pregnant, breastfeeding, or have undergone oestrogen related cancer. 

30 ml - 2 to 3 months of use.

HOW TO USE

Apply 3-5 drops and massage the face gently in the morning and at night. Shake before use. Keep in a cool, dry place below 25 degrees Celsius.

INGREDIENTS

Aqua, Propanediol, Glycerin, Inulin, Helianthus annuus seed oil, Protium heptaphyllum resin, Caesalpinia spinosa gum, Sodium hyaluronate, Aloe barbadensis leaf juice powder, Magnesium Chloride, Saccharomyces/Grape ferment extract, Lactobacillus ferment, Coco glucoside, Decyl glucoside, Ethyl lauroyl arginate HCl, Sodium citrate, Sodium benzoate, Parfum (100% natural)

PACKAGING

All our packaging is 100% recyclable.

WHAT SETS IT APART.

01

HYDRATION THAT WORKS AT THE CELLULAR LEVEL.
The combination of hyaluronic acid and magnesium helps optimise the skin’s moisture balance, delivering increased hydration in just 2 hours (+26%), plumper-looking skin and visibly smoother fine lines.

02

MORE THAN JUST A HYDRATING SERUM.
A patented active ingredient acts on vitamin D receptors, while probiotics support microbiome balance. Together, they help strengthen the skin’s natural defences.

03

TESTED FOR ENDOCRINE DISRUPTION.
Tested for oestrogenic and androgenic endocrine-disrupting activity. Test performed on the finished formula.

VISIBLE RESULTS, PROVEN TO HYDRATE, DERMATOLOGICALLY TESTED

100%

Soothed & softer skin

100%

Healthier-looking skin

91%

Reduced appearance of pores & breakouts

77%

Reduced appearance of fine lines

*Based on a 28-day self-assessment study involving 22 women aged 25–65.

3 THINGS NO OTHER SERUM COMBINES

PATENTED PEPTIDES

Activates vitamin D receptors in the skin, key biological regulators of its natural defence system.

COMPLETE SYNBIOTIC SYSTEM

Strengthens the skin barrier through a combination of probiotics, prebiotics and postbiotics.

HYALURONIC ACID

A medium molecular weight works synergistically with to the magnesium chloride to plump skin cells with hydration. In a lightweight, non-sticky gel. 

WE TEST WHAT ALMOST NO ONE TESTS.

Chemicals can behave differently together than alone. It is called the cocktail effect. So we test the finished formula, not single ingredients.

Tested free of estrogenic and androgenic endocrine disruption

FAQ – FREQUENTLY ASKED QUESTIONS

I have sensitive and reactive skin. Can I use this serum?

Yes, this serum is perfect for soothing the skin. The probiotics, prebiotics, the vitamin D-like and hyaluronic acid work together to support your healthy cell proliferation while calming the skin.

Why are probiotics important in skincare products?

Probiotics are defined as live good bacteria. On the skin, they defend us against pathogenic microbes, help to hydrate the skin and to repair skin wounds. We invite you to read our blog article on microbiome for more information.

Probiotics help in diversifying our skin microbiome and the right diversity is key in allowing the skin to carry out its job properly.

What's the difference between probiotics, prebiotics, postbiotics?

Prebiotics are the food the probiotics live on, such as nutritional fibre. Probiotics are live good bacteria. Postbiotics are the by-products that probiotics produce to benefit human health.

You can find more information on our blog .

Does the product need to be refrigerated?

The serum does not need to be refrigerated, but it must be kept in a cool, dry place, with temperatures under 25 degrees Celsius.

  • 5 stars: 38 (95%)
  • 4 stars: 2 (5%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
L
Lucie Styring
Brilliant

Great product, will repurchase. Thank you

A
Angela Hillary (United Kingdom)
Love skin diligent 🙂

I have several of your products and love all of them. I am 74 with the inevitable wrinkles, however the quality of my skin has improved……more plump, more even in tone and just healthier all round 🙂

L
Laetitia B. (France)
A must-have

It’s a product I recommend all the time

C
Catherine (Switzerland)
Exceptional

A brilliant serum that I’ve been using regularly for a long time.
I’m always very happy with it. The clean formula is really important to me.

D
Dominique B. (France)
What a relief!

I've been using Skin Diligent products (serum, vitamin C and night cream) for almost two years now, and I'm really happy to have finally found a routine that suits me perfectly. My skin is radiant and no longer feels tight. It feels so comfortable!

c
christine d. (France)
Currently undergoing restoration...

This serum allows my skin, which is sensitive to the cold and rosacea, to gradually restore itself. We'll see how it goes in the long term, but I can't wait to add it to my routine :)

P
PASCALE B. (France)
Essential

I can't do without it anymore. It feels like a second skin, and my only regret is not having discovered Skin Diligent sooner.

L
Laetitia S. (France)
Very good serum, very satisfying 👍👍👍

Very good texture on the skin, good product

H
Hélène D.
Effective, lightweight and moisturising

A product that is comfortable to apply as well as being effective

C
Claire L.
Delighted

A new beginning

I found the hydration I had been searching for with this serum.

E
Elodie D. (France)

Excellent as always

B
Béatrice B. (France)
Never without...my cellular hydration serum...

I'm on my second bottle and I'm a fan! Immediate relief if my skin is uncomfortable, it becomes soft and velvety.

K
Kathya B. (United Kingdom)
Excellent

Moisturises well but doesn't leave the skin greasy, very nice texture! Like all Skin Diligent products, a must-have!

F
Florence D. (France)
High quality

Immediate moisturising effect!

M
Mary Mori
Great product

This product has made a real difference to my skin. I had always had problems keeping my skin hydrated but not anymore.

V
Valérie M. (France)
Super

My skin doesn't usually tolerate much and now everything is fine! My skin is smoother. I'm going to try the vitamin C serum!

M
Marine (France)
A must

I love this serum, which is part of my morning routine. I love its texture and fragrance. It moisturises my skin just right (I have combination skin), I apply the Vit C oil serum afterwards, it's the perfect combo!

N
Nelly G. (France)
Super

I use the hydration serum and then the vitamin C serum in oil, not greasy at all! It's a great morning routine. For holidays I also use the 2 in the evening to nourish my skin.

S
Stephanie F. (France)
Exceptional

Fresh texture, very enjoyable scent, absorbed very quickly without feeling greasy. I love it!

E
Elisabeth T.
Excellent serum

A serum that's very enjoyable to apply, absorbs quickly and doesn't feel sticky. I've only been using it for 10 days and my skin feels very comfortable, my complexion looks great in combination with the cream in the evening, and my skin wakes up looking great!

S
Sophie P. (France)
Excellent

My mature skin absorbed this serum straight away. Doesn't stick, leaves skin soft and perfectly hydrated for the day. Very nice discovery. I'm a serum fan and this is clearly one of my favourites.

D
Dominique V. (France)
Super moisturiser before vitamin C

Perfect for moisturising the skin

C
Carole G.
Perfect

Effective, enjoyable, this product combined with vitamin C is simply perfect!

V
Veronique B (France)
Excellent Product

I'm delighted with this serum! I use it morning and night with the vitamin C serum in the morning. My skin is fair, fine, dry and very fragile, but since I've started using this serum it's been rehydrated, even-toned and soft.
No more flaky skin, no more imperfections... I can't do without it. I love it!

I
Isabelle D. (France)
A must-have

Immediate and long-term effect on the skin, which is more toned and radiant. Completely integrated into my daily routine, along with the moisturising serum. Very nice composition too! Thank you Skin Diligent

M
Maite L (France)
Addictive / ultra-moisturised skin

A pleasure for the senses and the skin

M
Myriam B. (France)
Won over

My skin is much brighter, moisturised and combined with your vitamin C it makes for a winning combo. Thank you and I have also just placed an order of your latest product and probiotics 👍 I highly recommend your products.

E
Elisabeth M.
Excellent moisturizing serum to go with the indispensable vitamin C serum. Real moisturizing power

A very easy and pleasant serum to apply, which I put all over my face and neck. I was left with comfortable, moisturized skin, after the serum had been absorbed very quickly. It is perfect as a first application before the vitamin C serum. The 2 combinations are simple and ultra-effective for healthy, luminous skin.

I
Isabelle M.
I can't live without it 🤩

I love the vitamin C serum as well as this cellular hydration serum, they complement each other exceptionally well and I use both morning and night.

S
Sabine V. (United Kingdom)
Excellent product

Very hydrating, just as promised

A
Aurelie B. (United Kingdom)
Very hydrating

A moisturizing and repairing serum that I used morning and evening on vacation in the sun. It is perfect for my skin, which has remained intact, soft and supple.

A
Agnes B.
Very pleasant to apply

Very light feeling, just started using it, too early to report on result.

E
Emmanuelle B.
Great product!

I use the Cellular Hydration Serum in combination with the Vitamin C Oil Serum and my skin has never been so soft! It's the first time I see a real difference!

×