Every time you look in the mirror, don't you recall the skin you used to have?
You've tried expensive skincare and layered on serum after serum — yet nothing changes. It must be such experiences that brought you here.
In fact, the reason that effort goes unrewarded is simple.Skincare only reaches the "surface."The real battlefield of skin aging is somewhere deeper.
- The scientific mechanism of the skin booster that improves skin quality from the root
- The decisive difference between a system that injects a fixed amount uniformly (the principle of water-light injection) and continuous injection (manual injection)the decisive difference
- The duration of effect by ingredient, and the optimal treatment schedule proven at the cellular level
After reading this, you will be able to understand not "which treatment to choose" but "why that treatment works." That is what leads to a choice you won't regret.
Before you give up, thinking "even expensive skincare has no effect...", please learn the truth of the medical technology that approaches deep into the skin directly.
The skin booster's approach to skin aging and its scientific grounds
First, there is an inconvenient fact you should know.
Skin aging is a complex biological process influenced by both genetic and external factors. The most important structural components of the dermis are collagen, elastin, and the ground substance, all of which are produced mainly by fibroblasts. About 90% (Landau 2015) of the dry weight of human skin is composed of type I collagen.
Here is the important point —
To normally produce connective-tissue components, fibroblasts need a stable collagen "scaffold" to which they can bind. This binding occurs via specific receptors on the surface of the fibroblast called integrins. Adhesion to a stable extracellular matrix acts to spread the cells out, and as the mechanical tension within the fibroblast rises, the production of new collagen is stimulated.
So what happens with aging?
When the scaffold becomes fragmented with aging, the fibroblasts collapse and their function to produce collagen declines. In other words, no matter what you apply from outside, it is meaningless in a state where the internal "factory" has stopped.
However, when a skin booster such as firm hyaluronic acid is injected into thinned skin, the stable scaffold is restored, the fibroblasts are stretched and activated, and the appearance and function of the skin improve.
"Does the effect really last?" — to this pressing question, the numbers answer.
In a study that injected stabilized hyaluronic acid into the dermis of the lower cheek of 19 female patients, it was found that micropuncture injection significantly increased the elasticity of the skin and had a positive effect on the roughness of the skin surface. The greatest improvement appeared24 weeks afterthe last injection session (Landau 2015) — meaning that regeneration occurs from the dermis over time, not immediately after the procedure.
The difference in injection methods: uniform injection (the water-light injection system) and continuous injection (manual injection)
"Water-light injection" and "manual injection" — are these two different? Aren't they the same thing with just different names? Have you thought so?
In fact,the purpose and the effect on the skin differ fundamentally.
The methods for delivering a skin booster into the skin include micropuncture based on precise metering (the principle of water-light injection) and conventional continuous manual injection. A certain dedicated syringe used in Europe adopts a mechanism called the smart-click system. This system precisely meters the product and delivers uniformly an amount of0.01 (Landau 2015) mLper click.
The flow of treatment is like this —
Monthly sessions are repeated over 3 months. During each session, multiple intradermal or subcutaneous micropuncture injections are applied to the target area at intervals of about 1 cm from each other. The injection is performed perpendicular to the skin surface, or carried out as linearly repeated clicks along an intradermal path, leaving 2 to 3 (Landau 2015) deposits of 0.01 mL of the ingredient. Thisuniform distributionis the key to activating a wide range of fibroblasts simultaneously.
On the other hand, how about manual injection (continuous injection)?
It is also possible to use it in the usual continuous mode without such a dedicated click system. However, in research this continuous mode is clearly distinguished as being used not for the broad skin-quality improvement of a skin booster, but for the purpose oflocal correction of skin defects or wrinkles (use as a filler).
To organize: the water-light injection system = raising the quality of the skin as a whole. Manual continuous injection = locally filling a specific area. The uses are fundamentally different.
The effect and duration by difference in booster ingredient (a comparison of PCL and PDRN)
The choice of ingredient greatly changes the duration of effect. Here we compare three ingredients.
A comparison of tissue regeneration between polycaprolactone (PCL) and hyaluronic acid (HA)
Even as the same "skin booster," hyaluronic acid and PCL behave completely differently within the body.
PCL-based products are composed of 30% PCL microspheres and 70% carboxymethyl cellulose (CMC). In a study using a rat model, 20 six-week-old male rats were used, and 0.5 mL of filler was injected supraperiosteally. To ensure even distribution, the total amount was divided among 5 different injection sites, with exactly 0.1 (Chu 2026) mL injected at each site.
After a comprehensive 4-month (Chu 2026) study, the result —
Tissue staining showed marked cellular infiltration around the PCL microspheres, demonstrating robust cell proliferation and integration into the surrounding tissue. By contrast, the HA implant, while keeping collagen formation to a minimum,merely maintained an empty cavity.
An even more decisive difference is the blood vessels. In the 1-month (Chu 2026) study, the HA filler was surrounded by a high-density scar layer with minimal cellular infiltration and limited degradation, whereas the PCL filler showed substantial tissue ingrowth. While vascular ingrowth was limited to the periphery in the HA filler, the PCL filler showedextensive neovascularizationthroughout the tissue.
Neovascularization = new blood flow = continuous nutrient supply. This is the source of PCL's long-term effect.
The effect of marine-derived polydeoxyribonucleotide (PDRN)
There is one more ingredient worthy of attention — PDRN (polydeoxyribonucleotide).
PDRN is a family of DNA-derived drugs extracted mainly from the sperm cells of salmon and trout, with a molecular weight in the range of 50 to 1,500 kDa. As a result of evaluating 70 studies on the extraction source, extraction from rainbow trout was in 40, extraction from chum salmon in 29, and extraction from sturgeon in 3. As for study types, there were 30 in vivo models and 27 clinical studies, mainly studying wound healing (17) and anti-inflammatory action (14 (Kim 2021)).
In animal experiments, a dose of 8 mg per kilogram of body weight is often used. In clinical studies in humans, the route of injecting 3 ml (5.625 (Veronesi 2016) mg) of PDRN intramuscularly or perilesionally is most commonly used.
Actual patient data are also persuasive — in a study of 32 patients (30 to 75 years old) with chronic tendinopathy, up to 5 PDRN injections markedly reduced pain. Also, in a study of 21 male patients (34 to 77 years old) suffering from genital disorders, it was reported that PDRN injection over 10 (Kim 2021) weeks improved overall quality of life without side effects.
The synergy of microneedle treatment and the clinical data
A comparison of treatment combining radiofrequency (RF)
"Is it worth enduring the pain to receive treatment?" — the numbers give the answer.
There is a study comparing the efficacy of fractional microneedle radiofrequency (FMR) and bipolar radiofrequency (BR) in the treatment of acne and acne scars. 23 patients were enrolled, and 20 (11 men, 9 women) completed. The average age was 22.8 (Min 2015) years.
FMR used a tip composed of 49 insulated needles over an area of 1 square centimeter, applied at level 2 to 3 for 50 to 70 milliseconds. BR was applied at 100 Hz with a force of 100 mJ/cm2, and patients received 2 (Min 2015) sessions at intervals of 4 weeks.
Look at the result —
The acne grade on the FMR-treated side decreased to 1.9 four weeks after the first treatment. The proportion rated as grade 1 at the final visit was90% (18 people) for FMR and 25% (5 (Min 2015) people) for BR— a 3.6-fold difference.
The number of inflammatory lesions was greatly reduced by 59.67% with FMR, and non-inflammatory lesions also decreased to 34.86% by day 84 after treatment. By contrast, the average number of lesions on the BR-treated side increased to 115.38%. As for the sebum secretion rate, a significant decrease was also observed on the FMR-treated side on day 56 (Min 2015).
On the objective evaluation score (ECCA), FMR improved from a baseline of 124.06 to 104.06 (P=0.001), surpassing BR's 124.38 to 116.88 (P=0.02 (Min 2015)).
Regarding pain, too, let us be honest — the pain score during the procedure was higher and more uncomfortable for FMR at 5.56 versus BR's 1.93. However, the final patient satisfaction score on day 84 after treatment was higher for FMR at 7.41 versus BR's 6.35 (P=0.004), and in the rating of improvement FMR was also 3.82, surpassing BR's 3 (Min 2015).
Momentary discomfort, or long-term satisfaction — which will you choose?
The safety and effect of microneedling as a monotherapy
For those who think "but I'm worried about side effects..." Let's check the numbers from a large-scale meta-analysis.
In a large-scale meta-analysis on the safety of treatment using microneedling therapy alone, 171 relevant articles were identified, of which 26 were randomized controlled trials. In the end, 12 papers were included in the quantitative analysis, and 414 (Shen 2022) participants were evaluated.
Regarding objective scar improvement, the pooled estimate for microneedling without radiofrequency had a mean difference of 0.42 (95% confidence interval: 0.12 to 0.73%), showing a significant difference. On the other hand, the treatment group with radiofrequency had a mean difference of 0.02 (95% confidence interval: -0.85 to 0.90 (Shen 2022)), showing no significance.
A point particularly worth noting in the side-effect data — the number of cases of secondary scarring or infection was0. The occurrence of post-inflammatory hyperpigmentation after microneedling therapy without radiofrequency was also reported as0 (Shen 2022) casesin 5 studies.
Regarding satisfaction, 9 trials of 292 people were analyzed, and the overall treatment effect compared with laser therapy had a mean difference of 0.03 (95% confidence interval: -0.53 to 0.59%) in 158 people. In the 4 studies of the non-laser group (134 people), the mean difference was 0.44 (95% confidence interval: -0.36 to 1.24 (Shen 2022)%).
In a tally of side effects based on another body of literature, erythema was reported in 26 studies, pain in 16, and edema in 16 after microneedle treatment. Also, post-inflammatory hyperpigmentation was recognized in 14 studies and acne flare-up in 2 (Mujahid 2019) studies.
Furthermore, efficacy has also been demonstrated in the skin of people of color. In a study of 31 patients with moderate to severe acne scars, after 4 treatments,81% of patients improved by 2 grades and 19% of patients by 1 grade— that is, some improvement was seen in all patients. Temporary erythema and edema were seen in all patients (100%), post-inflammatory hyperpigmentation was reported in 16%, and linear marks in 6%. In a trial of 20 patients with melasma, the score improved by 7.1 points in the serum-alone group, whereas the group that also used microneedling showeda large reduction of 10.1 (Cohen 2015) points.
The long-term lasting effect and the recommended treatment schedule
Finally, we answer the most important question — "how long does the effect last?"
It has been proven that, after repeated micropuncture procedures, the amount of collagen and elastin in the skinincreases by 400%after 6 months, and the granular layer thickens markedly after 1 (Pajak 2022) year.
This is not a temporary "plumpness." It is an essential regeneration in which the structure of the skin itself changes.
To obtain the optimal tissue-remodeling effect, it is recommended to leave an interval of 2 to 4 weeks, and in some cases up to 8 (Pajak 2022) weeks, between sessions. A plan that does not rush and that matches the skin's regeneration cycle is the key to maximizing the long-term effect.
Summary of this article
- The principle of the water-light injection system: by means of fine, uniform injection, it builds a stable scaffold within the skin and physically stretches the fibroblasts, thereby directly promoting collagen production. Unlike manual injection (continuous injection) aimed at locally filling wrinkles, this is an approach that improves the quality of the skin as a whole.
- The characteristics by ingredient: hyaluronic acid is excellent at restoring the scaffold, and PCL induces long-term neovascularization and sustained collagen production. Also, marine-derived PDRN has powerful anti-inflammatory action and wound-healing power, accelerating the repair of tissue.
- The long-term effect that science proves: treatment using microneedling or radiofrequency, although accompanied by pain, has very high long-term patient satisfaction, and it has been scientifically proven that collagen and elastin increase by 400% (Pajak 2022) from a few months to one year after treatment.
If you find yourself thinking, "What about my case?"
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Author of this article
Hiromitsu Nakamura Ginza Clinic Physician
Zetith Beauty Clinic Ginza, Osaka Shinsaibashi, and Fukuoka clinics
He has a track record of research presentations at domestic and international academic conferences, and is also engaged in technical guidance and education for Zetith Beauty Clinic as a whole. He specializes in precise aesthetic medicine based on anatomical grounds, pursuing natural results tailored to each person's bone structure and tissue.