Conducted by Incheon National University, Hyundai Bioland, Catholic Kwandong University College of Medicine, and Korea University, this study suggested magnolia bark extract as a potent new ingredient for the anti-ageing cosmetic market.
Laboratory cellular analysis was combined with human clinical trials to demonstrate that the extract significantly improved neck wrinkles, skin elasticity, and overall complexion.
Unlike many traditional antioxidants that simply mop up free radicals, this ingredient targeted the root cause of cellular ageing by triggering a biological clean-up process called mitophagy.
Skin ageing is largely driven by reactive oxygen species (ROS), which are unstable molecules that damage the collagen and elastin supporting the skin’s structure.
Most ROS are generated within the mitochondria during energy production. As humans age, these organelles become dysfunctional and leak more ROS, creating a cycle of damage that leads to deep wrinkles, sagging, and a loss of firmness.
The researchers tested a liquid form of Magnolia officinalis bark extract, which can be added directly to formulas without being dissolved first.
In tests on human skin cells, the extract restored mitochondrial function and increased the efficiency of oxygen consumption. This finding proved the ingredient could work on a functional, metabolic level rather than just providing a superficial coating to the skin surface.
Crucially, the study found that the extract activated mitophagy — a selective quality-control mechanism where the cell identifies and destroys damaged mitochondria. By removing these “faulty” energy plants, the extract prevents the excessive production of ROS before they can damage the surrounding skin matrix.
This proactive approach to cellular health represents a shift in anti-ageing product formulation, moving from reactive protection to active cellular renewal.
Clinical results show visible improvements
To confirm these laboratory findings, the team conducted a four-week clinical trial involving 21 Korean women with a mean age of approximately 57 years.
Participants applied a cream containing 3% magnolia liquid extract twice daily. The choice of 3% reflected the standard concentration used in high-end cosmetic bases to ensure the active ingredients can penetrate the skin barrier effectively.
The results showed a clear difference between the treatment group and those who had used a standard vehicle cream without the active ingredient.
After 28 days, the mean depth of neck wrinkles in the magnolia group decreased by 12.73%, while the maximum wrinkle depth saw a significant reduction of 17.44%. These figures are particularly impressive, given the notorious difficulty of treating neck wrinkles due to thinner skin that is more prone to sagging than the face.
The researchers noted that these effects were supported by a 3.76% increase in skin elasticity, which acts as a precursor to wrinkle reduction. By restoring bounce to the skin, the extract helped smooth out existing lines and prevent the formation of new ones.
The extract also addressed skin quality beyond just lines and wrinkles. Measurements of skin texture showed that mean roughness fell by 12.73%.
Furthermore, the participants’ skin complexion became brighter, with a 0.76% increase in skin brightness values. While the brightness increase was subtle, it was statistically significant, indicating a more uniform and radiant skin tone.
A stable solution for anti-ageing formulations
The study highlighted that according to chemical analysis, the liquid extract contained high levels of two active compounds, honokiol (12.2%) and magnolol (6.29%).
These biphenolic compounds are responsible for the extract’s anti-inflammatory and antioxidant properties, and have been used in traditional medicine for centuries.
The researchers noted that the liquid extract was produced using standardised protocols that ensured a consistent concentration of active ingredients. This reduced the variation often seen when using dry plant powders in large-scale production.
In this study, the extract was prepared using 70% ethanol reflux, followed by stabilisation in butylene glycol and polyglyceryl-10 oleate. This manufacturing process ensures the bioactive molecules remain stable and effective throughout a product’s shelf life.
The researchers also confirmed that the extract did not increase the expression of certain markers in young cells that could lead to negative side effects, making it a safe profile for diverse age groups.
New mechanism for next-generation cosmetics
The research suggested that the beauty industry could move beyond simple free-radical scavenging toward more sophisticated “mitochondrial rejuvenation” strategies. By focusing on the health of the mitochondria, products can help the skin maintain its own structural integrity more effectively.
While the study was limited to a single ethnic group and a relatively small sample size, the researchers believe the results provide a strong scientific foundation for the ingredient. The extract also did not show any adverse effects or skin irritation during the trial period.
Additionally, the authors suggested that the reduction in mitochondrial ROS demonstrated in fibroblast-based experiments was the underlying cause of the clinical improvements observed. This discovery points to a dual-action benefit for the premium skin care market.
It offers a natural, plant-derived story that appeals to modern consumers seeking clean and botanical ingredients, and is backed by clinical data regarding its ability to physically remodel the skin’s surface and improve its underlying mechanical properties.
The researchers also suggested that further studies could look at longer-term applications to verify if the results, such as the 12.73% reduction in wrinkle depth, would continue to improve over several months of use.
Source: Cosmetics
“Liquid Extract from the Bark of Magnolia officinalis Rejuvenates Skin Aging Through Mitochondrial ROS Reduction”
https://doi.org/10.3390/cosmetics13010022
Authors: Lee Yun Haeng, et al
