THE QUARTET
Why you need this system:
Achieve beautiful skin with 4 products. With the SKIN DILIGENT FOUNDATIONAL SYSTEM, you can train your skin to become healthier and stay that way. It's the equivalent of a regular 2-minute morning and evening fitness session for your skin cells.
Why is this system different from a routine?
The SKIN DILIGENT FOUNDATIONAL SYSTEM has been created on the foundation that skin is an evolving, ageing and active organ, and that skin reflects the daily internal and external factors that it has to deal with everyday. Routines assume that a person belongs to a category of a skin type, for example, a routine for oily skin, for anti-ageing, etc, and they are based on the notion that once you have dry skin, you will always have dry skin.
The principle of the SYSTEM is to focus on the skin's cellular health in order to boost the skin's natural ability to do its job well at any age. When skin care focuses on cellular health, the prevention and improvement of fine lines, hyperpigmentation and blemishes happen naturally, at source. This means targeting the causes, not just the symptoms.
Starting from a simple base of four products, this system can be adopted and adapted to suit individual needs.
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.