It's about that time again — our November Brand Evaluation Program is officially open! Love trying out new products? You've come to the right place! Our monthly Brand Evaluation Program is an opportunity for beauty lovers like you to test and review select products, in a "focus group" style way. The featured product this month is the Serum C20 - Anti-aging, Radiance, Unifying by Yon-Ka Paris.

You will have the chance to receive a 5 ml bottle (valued at $44), that can be used for a FLASH CURE INTENSIVE treatment over10 days ( visible results have been proven after 5 days).

The official launch of its 30 ml full size bottle is planned for January 2023 and Yon-Ka Paris needs your feedback!

If selected to participate, you will receive the featured product for free, in exchange for your valued insights and opinions. After testing the product thoroughly and consistently over a 10-day period, all selected participants must submit a mandatory brand evaluation form about their experience. As always, this opportunity is available for BeautyQlub members only, but it's never too late to become one!

You must be a member of our BeautyQlub in order to apply for our Brand Evaluation Program. Don't worry, it's totally free! Being a BeautyQlub member gives you access to exclusive opportunities through Beautyque including live events and workshops, giveaways, and of course, our Brand Evaluation Program. Sign up by completing the form below.

If you're already a member of our BeautyQlub, then you're ready to apply for this month's Brand Evaluation Program! Please note that we receive hundreds of applications per month, and while we wish we could select each and every one of you, we are only able to select a limited number of product reviewers. Apply to be one of our reviewers for September by completing the form below.


Yon-Ka used this cutting-edge active ingredient to develop a high-performance oleo-serum that fits into any beauty routine, applied at any time of year, to even out the complexion and fight wrinkles and dark spots.


A New Generation MULTI-CORRECTIVE and MULTI-SENSORY VITAMIN C SERUM which highlights 3 YON-KA Paris brand commitments:

DERIVED from, NATURE – 99.9% Ingredients of Natural Origin
PROVEN EFFECTIVENESS –clinical tests were conducted by an independent lab under the auspices of a dermatologist.
Visible effectiveness in just 5 days! - Visible results and improved skin radiance was obtained after a FLASH CURE INTENSIVE of just 5 days of daily application.
SENSORALITY – Serum C20 stands alone as the only “aromatherapeutic” Vitamin C Serum due to essential oils of Sweet Orange, Lavender, Geranium, Cypress, Rosemary, and Thyme.
Key Highlights:

Formulated with 99.9% ingredient of natural origin.


Obtained via the exclusive process of cell culturing native cells of Turmeric and Pomegranate intensify the multi-corrective actions of Vitamin C (wrinkles, skin density and dark spots)

Every bottle contains 1.5 million fresh cells resulting in 25,000 per application.

Formulated for all skin types/all ages (genderless) – even sensitive skin.

No preservatives, water, acids, or alcohol
100% vegan

Clinical test results:

SENSORALITY – Serum C20 stands alone as the only “aromatherapeutic” Vitamin C Serum due to essential oils of Sweet Orange, Lavender, Geranium, Cypress, Rosemary, and Thyme.

Vitamin C Spotlight
A new generation of Vitamin C: Ascorbyl Tetraisopalmitate
While other serums are subject to oxidation which can reduce effectiveness by -50%, SERUM C20 is fully stabilized and delivered in a light, fast absorbing oil base (oleo-serum).

YON-KA has been able to formulate with an impressively high concentration of 20% Vitamin C, levels which are unmatched by the competition. Its non-acidic nature is well-tolerated by all skin types, even sensitive skin.

No preservatives, water, acids, or alcohol
100% vegan

Formulated with 99.9% ingredient of natural origin

1 - Native Curcuma longa plant cells – a powerful antioxidant
Known for its extraordinary antioxidant power, Curcuma longa in its “native cell” form improves skin tone and elasticity. It complements the protective, anti-wrinkle actions of vitamin C.
In the epidermis(*), native turmeric plant cells encourage epidermal cell renewal by increasing the proliferation of keratinocytes by 16%.
The following observations have been made in the dermis(*):
+ 17% increase in collagen and elastin fiber synthesis.
+ 20% increase in GAG synthesis, including hyaluronic acid.

2 - Native pomegranate plant cells – an extraordinary secret for skin heath
Native pomegranate cells help skin boost its own radiance and even out the complexion. They bolster the radiance-boosting, anti-dark spot actions of vitamin C.
Native pomegranate plant cells help regulate melanogenesis(*):
By regulating tyrosinase, native plant cells reduce melanin synthesis by 15%.

3 - Organic apricot oil – a luminizing oil
Obtained from organic apricots, the oil extracted from the kernel is high in vitamins A and E, as well as phytosterols, giving it the ability to deliver a true radiance boost to skin and fight aging. It also contains high amounts of omegas 9 and 6, known for their nourishing, softening, suppleness-boosting properties.

4 - Yon-Ka Quintessence – our treasure
Yon-Ka Quintessence is the brand’s true DNA. This exclusive complex of 5 essential oils (lavender, geranium, rosemary, cypress, thyme) increases the power of the rest of the formula.

Flash Cure Intensive treatment

Follow the same method below morning and evening for a period of 10 days.
It can be used as an express radiance treatment for up to 5 days, two times on a row.
May also be used post-procedure (injections, micro-needling, etc.).



That's the motto of Catherine and Françoise Mühlethaler sister-owners of the heritage brand Yon-Ka Paris.
Long before #cleanbeauty was a buzzword…

Fiercely passionate for the plant kingdom and visionary entrepreneurs, the two sisters – Catherine (an aesthetician) and Françoise (a biochemist) joined forces – and career paths – in an empowering mission to bring what nature can best offer to beauty!

Since Yon-Ka laboratories first launched in 1954, the company has pioneered the production of cutting-edge aromatherapy and phytotherapy formulas that merge botany, scientific innovation, wellness, and beauty.


Applications will be accepted from November 10th at 12:00 pm EDT to November 17th, 2022 at 12:00 pm EDT.