The Science Behind Beauty: Clinical Proof Driving Our Latest HL/Skin Line

Featuring a range of carefully formulated products targeting the leading skin needs, Brightness & Illumination, Healthy Ageing, and Moisture & Hydration, HL/Skin combines advanced Korean skincare science with meticulously chosen ingredients to deliver effective, science-backed formulas that truly perform.

To confidently provide a complete and trustworthy picture of performance for the new HL/Skin range, the full range went through extensive testing:
 

• 14 clinical trials were run to check both safety and visible results across the range.
• Over 600 participants with different skin types, ethnicities, and lifestyles tried the products.
• More than 4,000 before and after images were captured and analysed using high tech skin imaging.
• The tests combined what people actually felt and saw on their own skin (consumer perception result) with high-tech skin testing technologies to measure results more objectively.
• This 360° testing approach means every product is designed not just to feel great, but to be shown effective while meeting our strict ethical and scientific standards.

Our suite of technologies included:
 

• Expert Clinical Grading: Independent expert graders assessed visible improvements in skin appearance at baseline (what their skin looks like on day 0), and after a certain period of time of product use in studies.
• Colourimetry (Chroma Meter® CR 400): Used to quantify changes in skin luminance, skin tone homogeneity and pigmentation levels through precise measurement. The Chroma Meter® CR 400 has a pulse xenon lamp that emits a pulsed light on the skin, which is reflected and collected by a photosensitive cell.
• PRIMOS® CR: An advanced 3D imaging technology that captures the skin’s surface in incredible detail — down to the micron-level detail (that’s onethousandth of a millimetre). It allows scientists to measure changes in wrinkle depth, volume, and skin texture, showing exactly how the skin improves in smoothness and refinement over time.
• VISIA® CR Imaging: Uses advanced, highresolution photography under carefully controlled lighting to capture detailed images of the skin. This technology analyses key features — including pores, spots, fine lines, and wrinkles — to track visible improvements over time. By evaluating changes in visible skin characteristics over time, it delivers precise, datadriven evidence of improvements in the skin’s appearance. The skin looks healthier and more refined.
• Corneometer® CM 825: Measured epidermal hydration levels, allowing quantitative evaluation of skin moisture retention.
• Tewameter® TM 300: Monitored transepidermal water loss (TEWL) to assess skin barrier integrity.
• Cutometer® Dual MPA 580: Measured viscoelastic properties to evaluate improvements in skin firmness and elasticity.
• Sebumeter® SM 815 Device: Used to accurately measure the sebum (oil) level on the skin surface. It works by pressing a special tape against the skin, which becomes transparent based on the amount of sebum present. The tape is then analysed by a photocell that measures light transmission, providing an objective and reproducible sebum content value. This device is widely used in dermatological research and cosmetic product testing to assess oiliness and the effectiveness of sebum-controlling formulations.

Now, let’s explore how science brought HL/Skin to life and see the impressive results from our clinical studies.

INSTRUMENTAL AND EXPERT-ASSESSED CLINICAL EFFICACY RESULTS:

Results assessed by the Instrumental Measurements with the Sebumeter® SM 815 Device¹.

• Immediate reduction in skin oiliness
• Reduction of skin oiliness after 30 days of use

Results assessed by the Instrumental Measurements with the Corneometer® CM 825 Device¹.

• Does not dry out the skin

¹ Tested on 32 women, aged 25-60.

CONSUMER PERCEPTION TEST RESULTS, BASED ON SELF-ASSESSMENT RESULTS WITH 32 WOMEN, AGED 25-60:

INSTRUMENTAL AND EXPERT-ASSESSED CLINICAL EFFICACY RESULTS:

Results assessed by Expert Grader after 60 days of use³.

• Improvement of smoothness/softness
• Improvement of luminosity/radiance/glow
• Improvement on skin brightness
• Improvement on skin tone evenness
• Improvement on spot clarity
• Improvement on pores appearance

Results assessed by Colorimetry - Chroma Meter® CR 400 Device after 60 days of use³.

• Improvement on spot lightening
• Improvement on skin tone homogeneity

Results assessed by PRIMOS® CR Device after 60 days of use¹.

• Improvement on wrinkles volume
• Reduction in wrinkles depth
• Improvement on skin texture and skin smoothness

Results assessed by Visia® CR Device after 60 days of use¹.

• Improvement in wrinkles visibility and size

Results assessed by the Instrumental Measurements with the Corneometer® CM 825 Device².

• 8 hours moisturisation

¹ Tested on 34 women, aged 44-65.

² Tested on 32 women, aged 25-60.

³ Tested on 36 women, aged 44-65.

CONSUMER PERCEPTION TEST RESULTS, BASED ON SELF-ASSESSMENT RESULTS WITH 36 WOMEN, AGED 44-65:

INSTRUMENTAL AND EXPERT-ASSESSED CLINICAL EFFICACY RESULTS:

Results assessed by Expert Grader after 30 and 60 days of use¹.

• Improvement of smoothness/softness
• Improvement of luminosity/radiance/glow

Results assessed by Instrumental Measurements of Transepidermal Water Loss - Tewameter® TM 300 60 days of use¹.

• Improvement of skin barrier

Results assessed by Instrumental Measurements of skin viscoelastic properties - Cutometer® Dual MPA 580, after 60 days of use¹.

• Improvement of skin elasticity

Results assessed by Instrumental the Analysis of Wrinkles (Volume and Depth) and Roughness/ Texture - PRIMOS® CR after 60 days of use¹.

• Improvement on skin roughness/texture

Results assessed by the Instrumental Measurements with the Corneometer® CM 825 Device².

• 8 hours of moisturisation

¹ Tested on 35 women, aged 41-60.

² Tested on 32 women, aged 25-60.

CONSUMER PERCEPTION TEST RESULTS, BASED ON SELF-ASSESSMENT RESULTS WITH 35 WOMEN, AGED 41-60:

INSTRUMENTAL AND EXPERT-ASSESSED CLINICAL EFFICACY RESULTS:

Results assessed by Expert grader after 60 days of use¹.

• Improvement of smoothness/softness
• Improvement of luminosity/radiance/glow
• Improvement of wrinkles around the eyes
• Improvement of dark circles

Results assessed by Instrumental Measurements of Skin Firmness Cutometer® Dual MPA 580 Device after 60 days of use¹.

• Improvement of skin firmness

Results assessed by Visia® CR Device after 60 days of use².

• Improvement of wrinkles visibility and size

Results assessed by the Instrumental Measurements with the Corneometer® CM 825 Device³.

• 8 hours moisturisation

¹ Tested on 33 women, aged 43-65.

² Tested on 31 women, aged 44-65.

³ Tested on 32 women, aged 25-60.

CONSUMER PERCEPTION TEST RESULTS, BASED ON SELF-ASSESSMENT RESULTS WITH 33 WOMEN, AGED 43-65: