THE QUARTET

ANTI-AGE - LONGEVITY - PREVENTION - CELLULAR HEALTH

£233.00 GBP
£220.00 GBP
Why it works ?

The QUARTET covers all the fundamental pillars of a healthy skin:

  • Cleansing
  • Exfoliation
  • Antioxidants
  • Skin cell longevity
  • Hydratation
  • Moisturisation
  • Skin barrier reinforcement
  • Blemishes
  • Post sun relief

HOW TO USE - DAY SYSTEM ☼

1. MANUAL EXFOLIATION

In the morning, just refresh with water. Moisten a cotton pad with mineral water, and wipe gently your face. The gentle wiping is your daily exfoliation.

2. CELLULAR HYDRATION SERUM

On a slightly moist skin, apply 3-4 drops of Cellular Hydration Serum. Alternatively, you can wet 1 hand, add 3-4 drops, rub hands together and apply on the face.

3. VITAMIN C SERUM-IN-OIL

Immediately after the Cellular Hydration, apply 3-4 drops of Vitamin C Serum in Oil.

*The combination of the Cellular Hydration Serum and the Vitamin C Serum in Oil is equivalent to a day cream.

NIGHT SYSTEM ☾

1. TRIPLE ACTION CLEANSER

If you wear heavy makeup, use Jojoba oil to remove makeup. Then apply 2 small pea size of cleanser, massage on the face for about 20 seconds, and rinse well. Pat dry.

2. TARGETED SERUM

Opt for Vitamin C Serum-in-Oil if you have been exposed to a lot of sun during day time or have extra dry skin. Otherwise, opt for Cellular Hydration Serum.

On slightly moist skin, apply 3-4 drops of the chosen serum.

3. EXOSOME ADVANCED NIGHT CREAM

Immediately after the serum, apply 2-3 pumps of the Exosome Advanced Night Cream.

FAQ

What's included in The Quartet?

The Quartet consists of four essential skincare products, selected to cover all the skin's fundamental needs:

  • Triple Action Cleanser – A probiotic cleansing gel with gentle exfoliating action, it purifies the skin without over-cleansing, drying it out or damaging the skin barrier. Enriched with probiotics, it helps to quickly restore the balance of the microbiome.
  • Cellular Hydration Serum – Designed for long-lasting hydration, this serum strengthens the skin barrier, helps the skin retain water in the tissues and prevents premature ageing.
  • Vitamin C Serum-in-oil - Helps combat oxidative stress and premature skin ageing at the cellular level. Lightweight, non-greasy formula that absorbs quickly.
  • Exosome Advanced Night Cream – A true innovation in regenerative cosmetics, this night cream is enriched with exosomes, which activate cell repair, strengthen the skin barrier and soothe inflammation.

A complete, minimalist and adaptable system, designed to support your skin all year round.

How long will the products last?

The cream and serums last for approximately 3 months. The cleanser, if used once a day, lasts for approximately 1½ months.

Can I use this cream in the daytime?

Yes, you can use it in the daytime as well, as its light texture is perfect under the makeup. It is free of photosensitive ingredients as well and therefore safe in the morning.

How do I use this cream in the winter or change of season?

This cream is perfect for layering up in the periods when the skin is adapting to changes in the environment, such as the heating indoors or the cold weather outdoors, or is particularly dry due to a stressful period.

As part of the morning protocol of Skin Diligent System, start with Cellular Hydration on slightly damp skin, followed by the Vitamin C Serum in Oil. Add a layer of the Exosome Advanced Night Cream to layer up on the days your skin needs the extra layer.

Can I use the Vitamin C Serum in Oil at night?

Yes, in periods when the skin needs an extra comfort at night or as an after-sun exposure in the summer. We do not recommend at the same time as the CEL Retinal as the combination of both products could be overstimulating for the skin.

  • 5 stars: 15 (94%)
  • 4 stars: 1 (6%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
L
Lisa Hannaby (United Kingdom)
Best skincare ever!

I have used what feels like hundreds of different skincare brands over the years. I always had pretty robust skin but then after some microblading, I developed erythematotelangiectatic rosacea. I tried all of the usual brands who supposedly “helped” symptoms. I tried laser. Then I entered perimenopause so my skin worsened again. I’d given up finding a solution and then I came across skin diligent. I’m a few weeks in to using the products and my skin feels the healthiest it has in 10 years. My redness has significantly decreased too. I still have hormonal flares but it’s nowhere near what it has been previously. It’s honestly like liquid gold.

C
Caroline D. (France)
Great products

Effective products – I recommend them

R
RUET C. (France)
Very good products

The cleanser is very enjoyable to use.
I really liked the vitamin C serum in the morning, and the night cream is very moisturising.
Very good experience

V
Valérie L. (France)
Very good

Excellent hydration!
However, the pump on the exosome cream bottle is difficult to use.

Hello,
Thank you for your message and your kind feedback.
In the case of airless packaging such as the one used for Exosome Advanced cream, there may be priming issues with the pump. If this is the case, simply tab the base of the bottle firmly on a hard surface 2-3 times and the pump should work again.
Thank you and have a great day.
The Skin Diligent team

J
Julie B.
Well done!

I can no longer do without vitamin C oil, Cellular Hydration and night cream. Well done and thank you for the high quality of your products and your constant quest to offer innovative products that are different from others, much more effective but affordable.

C
CAROLE G.
Exceptional 🔥

I've been hooked since the very first day, and it's been three years now!

c
christine p. (France)
I love it!

I have been using the products for two years and am very satisfied. Despite the slightly high price, I remain loyal to the brand and always recommend it.

L
Laetitia U. (France)
Ideal routine

Initially, there was no “wow” factor. But I liked the simplicity of this routine. I love the cleanser: ultra-gentle texture and “fresh” effect. From the 3rd week onwards, there was a clear improvement in skin hydration: I no longer had any dehydration lines, nor any discomfort or tightness, regardless of my lack of sleep or my cycle. Very satisfied

L
Laura Hazlewood (United Kingdom)
Great products

Nice products, non greasy. struggling a bit with acne with them but on the whole feels like they are helping my skin. cleanser size is a bit small to balance other size products in the kit - will run out of that first. Havent needed to wear as much makeup as i used to.

Thank you for the very good feedback. Regarding the cleanser, please note that it is 86% glycerin based unlike typical cleansers which are 85-90% water. We chose glycerin because it is far more hydrating and soothing than water and much better for sensitive skin. It is also far more concentrated and you need to use 3-4 times less product than usual. Regarding acne, we strongly recommend using our Regulation Serum which is dedicated to this condition. Since you have the Quartet, you just add the Regulation serum am and pm before any other serum and you only apply it on the spots and inflamed areas. This serum will make a difference.

S
Sonia G. (France)
Super products

Great products!

N
Nadine J. (France)
Satisfactory

Is it true that the serum is applied before the vitamin C?

Thank you for your feedback. Absolutely, we recommend applying the Cellular Hydration Serum first, followed by the Vitamin C Serum. The oil content of the second serum will seal in the hydration even better, and the layering of these 2 serums will create a mini emulsion on the skin which is the equivalent of a day cream. After that, you only need to apply an SPF if you're going to be out in the sun.

L
Laurence M. (France)
Very satisfied

I am won over, I have finally found my beauty routine
Thank you Marine🤩

A
Anonymous (France)
Very good

Hi, I'm Julie LAINÉ and I've already placed two orders for Quatuor with you. I think the products are great. My complexion is very radiant and my spots have diminished. The only thing for me is that in the evening, despite the 2 serums + the cream, I find that the cream isn't rich enough and my skin feels tight. And there's just one little problem with the facial cleanser, which I love! It's great, but it's in too small a quantity. I'd rather pay more but get a bigger tube that lasts longer. Anyway, well done! These are great products that I'd recommend to all my friends.

S
Sabine R. (France)
A wonderful discovery

I love your products. Very nice to apply. My skin is beautiful and replenished, and spots are fading. I have the impression that the fine lines are fading, but it's too early to tell. I've given it 4 stars because I find the size of the cleanser really tiny.

l
lorraine g. (Belgium)
Very effective, very nice and discreet smell.

I don't usually give my opinion on brands.
But these products are just perfect! AND effective! Everyone tells me that my skin looks better, I'm 48 and going through menopause troubles, I've been using the trio skin diligent for 10 months and the quatuor for 1 month, and I never feel dry skin again. THANK YOU!
One last thing, I don't like it when products smell too much, but this is just perfect! A very nice, natural smell.

M
Magalie B. (France)
EFFECTIVENESS AND SIMPLICITY

I love everything about this routine! it is SIMPLE and EFFECTIVE! My skin is hydrated, smoother, and comfortable. The scent of the products is very enjoyable. The night cream is exceptional!!! The serums are perfect!!! The value for money is TOP!!!

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