Liquid Facelift & Combination
Prejuvenation (Preventive Aesthetics)
Prejuvenation is a proactive medical aesthetic approach that embraces the philosophy of "preserving rather than correcting": before clinically visible signs of ageing (static wrinkles, volume loss, ptosis) appear — typically between the ages of 25 and 40 — it combines low-dose neurotoxin (micro-Botox), superficial hyaluronic acid fillers, biostimulators, chemical peels, retinoids and a photoprotection regimen, based on the principle of preserving the dermal collagen reserve, delaying static line formation and sustaining tissue homeostasis over the long term.
Dr. Hamza Gemici
Medical Doctor — Medical Aesthetics Physician
Review date:
In short: Prejuvenation (preventive aesthetics) is the philosophy of preserving the dermal collagen reserve between the ages of 25 and 40, before dynamic lines turn into static wrinkles, using low-dose micro-Botox, superficial HA filler, biostimulators (Sculptra, Profhilo, polynucleotide), chemical peels, retinoids and disciplined photoprotection. The principle of "preserving rather than correcting" — in Carruthers' longitudinal data, a 50% delay in static line formation over 5 years. Individualised; not "Botox for everyone".
Definition
Prejuvenation is a term derived from the combination of the English words "prevention" and "rejuvenation"; it was first described in the clinical literature in the 2010s by Carruthers, Glogau and other aesthetic dermatologists. Whereas classic rejuvenation is the treatment of signs of ageing, prejuvenation is built on delaying the onset of the ageing process and preserving dermal reserves.
The core claim of the philosophy: once tissue biology has reached an irreversible point (static wrinkles, deep volume loss, marked ptosis), the ceiling of treatment success falls. In contrast, low-dose, high-frequency micro-interventions performed between the ages of 25 and 40, while dermal collagen, elastin and hyaluronic acid reserves are still high:
- Delay the conversion of dynamic lines into static wrinkles (micro-Botox effect)
- Superficial hyaluronic acid fillers prevent volume loss before it begins
- Biostimulators (poly-L-lactic acid, polynucleotide, calcium hydroxylapatite) stimulate collagen synthesis early
- Chemical peels + retinoids keep keratinocyte turnover at a youthful level
- Photoprotection (SPF 50+, antioxidants) suppresses UV-induced photoageing
An important point of clinical ethics: "Botox for everyone at 25" is not what prejuvenation means. Consensus guidelines from the American Society for Dermatologic Surgery (ASDS) and the International Society of Aesthetic Plastic Surgery (ISAPS) require the prejuvenation protocol to be applied on the basis of an individual risk assessment: photoageing grade (Glogau I-IV), family history (early volume loss, deep glabellar lines), expression pattern (hyperdynamic glabella, periorbital), genetics (MMP-1 polymorphisms, type I collagen variants) and lifestyle (UV exposure, smoking, BMI). Treatment without an indication carries the risk of over-treatment and a socially visible "frozen face".
How It Is Performed
Prejuvenation is not a single procedure but a multimodal proactive regimen. A typical prejuvenation programme includes the following components:
- Baseline Assessment (Initial Consultation): AI skin analysis (Visia/Observ), the Glogau photoageing scale, observation of the dynamic expression pattern (smiling, frowning, squinting), family history, phototype (Fitzpatrick), lifestyle questioning (UV, smoking, sleep, nutrition) and, if necessary, a hormonal panel (assessment of perimenopause in female patients).
- Micro-Botox ("Baby Botox" / "Preventive Tox"): A lower-than-standard dose is used, determined individually by the physician based on anatomy, muscle strength and product labelling. Typical target areas:
- Glabellar (procerus + corrugator): a lower dose than a full treatment dose
- Frontalis: a reduced dose — only if dynamic over-contraction is observed
- Periorbital (orbicularis oculi, crow's feet): a reduced total dose
- Micro-dot distribution: very small intradermal amounts at multiple points — mild modulation of superficial muscle tone, expression is preserved
- Superficial Hyaluronic Acid Fillers ("Skin Boosting / Hydroboosters"):
- Restylane Vital, Skinvive (Juvederm), Profhilo: Stabilised hyaluronic acid + N-acetyl glucosamine; intradermal micro-boluses (a very small amount per point, set by the physician), 30-50 points per session
- Areas: Periorbital, perioral, décolletage, hands
- Protocol: 3 sessions at 4-week intervals, then maintenance every 6 months
- Effect: Dermal hydration, micro-elasticity, "glow" — it is not volumetric filling
- Biostimulators (Collagen Synthesis Stimulators):
- Poly-L-Lactic Acid (Sculptra): Subdermal micro-aliquots; stimulation of fibroblast type I-III collagen synthesis; 3 sessions at 4-6 week intervals; the effect becomes clinically visible in 3-6 months and lasts 18-24 months
- Polynucleotide (PDRN — e.g. Plinest, Newest): Salmon DNA fragments; intradermal micro-injection; stimulation of fibroblasts, angiogenesis and anti-inflammatory activity; 4 sessions at 2-week intervals
- Calcium Hydroxylapatite (Radiesse): Diluted form (1:2 saline), intradermal "biostimulator mode"; peripheral face + neck, décolletage
- Exosomes: Mesenchymal stem cell-derived exosomes, topical + microchannel delivery (after microneedling/RF treatment); research + early clinical data
- Chemical Peels and Retinoid Regimen:
- Topical retinol/tretinoin (strength chosen and titrated by the physician) nightly — collagen synthesis + keratinocyte turnover
- Superficial chemical peel (glycolic acid, mandelic, lactic) series at 4-6 week intervals
- Medium-depth (Jessner, TCA 15-20%) 1-2 sessions a year
- Energy-Based Micro-Treatments:
- Microneedling RF (Morpheus8, Sylfirm X), 2-3 sessions a year for subdermal collagen remodelling
- Picosecond laser (PicoSure, Discovery Pico) for superficial pigment + collagen stimulation
- HIFU is considered only in selected candidates, after the intended use of the exact device/model and the manufacturer's instructions have been verified; there is no age-based fixed number of sessions or annual "lifting maintenance" protocol.
- Photoprotection + Antioxidant Regimen:
- Daily broad-spectrum SPF 50+ (mineral or chemical)
- Topical antioxidants: vitamin C 15-20% + ferulic acid + vitamin E (morning)
- Oral antioxidant: nicotinamide (B3), only as advised by the physician — preventive evidence for non-melanoma skin cancer
- Astaxanthin, polypodium leucotomos extract supplementation (reducing UV stress)
- Lifestyle Components: Stopping smoking (collagenase activation), sleep optimisation (HGH peak), Mediterranean diet (omega-3 + polyphenols), stress management (cortisol-driven collagen breakdown), exercise (microcirculation).
A typical annual prejuvenation programme for a 30-year-old patient: 2-3 micro-Botox sessions + 1 biostimulator course + 6-8 superficial HA sessions + 4-6 peels + 1-2 energy-based sessions + an ongoing topical regimen. The cost/ROI calculation is compared with the "cost of corrective treatment" over a 5-10 year time frame.
Indications
Prejuvenation is recommended in the following clinical situations:
Primary Indications
- Hyperdynamic Expression Pattern (Age 25-40): Marked glabellar muscle activity (frequently observed dynamic lines), overuse of the frontalis, periorbital squinting (high UV exposure). Here, micro-Botox delays static line formation.
- Early Photoageing (Glogau I-II): Superficial pigment, mild elastosis, loss of radiance; candidates who do not need aggressive rejuvenation but are suited to a preventive retinoid + antioxidant + peel regimen.
- Family History: Early volume loss, deep glabellar lines, sagging. Where there is a genetic predisposition, the benefit of proactive intervention is high.
- High Environmental Risk: Intense UV exposure (water sports, outdoor professions), smoking, chronic stress — accelerated photoageing + collagenolysis.
- Postpartum Dermal Recovery: Postpartum decline in collagen + oestrogen; the benefit of Profhilo / polynucleotide + retinoid is proven.
- Perimenopausal Transition (Women Aged 35-45): Oestrogen withdrawal leads to loss of dermal thickness and hydration; biostimulator + HA hydrobooster maintenance.
- Ideal Candidate Without a Conflicting Treatment History: A healthy patient with an unremarkable medical history and realistic expectations; the logic of a "preventive investment".
Secondary Indications
- Hair and Neck Prejuvenation: Light Botox for (platysmal) neck bands + a PDRN meso-neck session
- Prejuvenation of the Backs of the Hands: Superficial HA hydrobooster + Sculptra (preventive for visible veins)
- Décolletage Prejuvenation: Polynucleotide + HA meso + retinoid + SPF
Contraindications
The prejuvenation protocol carries the contraindications of its individual components:
Absolute Contraindications
- Pregnancy and Breastfeeding: Neurotoxin, biostimulator, polynucleotide, retinoid (even topical) — all are contraindicated in pregnancy.
- Active Local Infection: Active acne, herpes outbreak, folliculitis — injections and peels are postponed.
- Body Dysmorphic Disorder (BDD): The psychological dynamic of "always wanting more" in prejuvenation is harmful in patients with BDD. Screening is recommended (Cosmetic Procedure Screening Questionnaire — COPS).
- Unrealistic Expectations: A patient who expects to "stop ageing"; prejuvenation delays it, it does not stop it.
- Age Unsuitability (Under 25): From the end of adolescence to age 25 there is no routine indication; it is not recommended except, exceptionally, with a family history and a hyperdynamic expression pattern.
- Neuromuscular Disease: Myasthenia gravis, Lambert-Eaton, ALS — Botox is contraindicated.
Relative Contraindications
- Autoimmune Connective Tissue Diseases: SLE, scleroderma — caution with biostimulators + fillers.
- Keloid Tendency: Caution with aggressive microneedling + peels.
- Immunosuppression: Post-transplant, biologic therapy (anti-TNF) — risk of infection.
- Active Anxiety/Depression: The psychological motivation behind the aesthetic expectation should be assessed after stabilisation.
- Financial Sustainability: Prejuvenation is a long-term investment; a "single session and then stop" strategy is not optimal — budget assessment.
Duration of Effect and Recovery
The components of prejuvenation act on different time scales:
| Component | First Effect | Duration | Repeat |
|---|---|---|---|
| Micro-Botox | 3-7 days | 3-5 months | Every 4-6 months |
| HA Hydrobooster (Profhilo, Skinvive) | 2-4 weeks | 4-6 months | Every 6 months |
| Poly-L-Lactic Acid (Sculptra) | 3-6 months (gradual) | 18-24 months | Every 2 years |
| Polynucleotide (PDRN) | 4-6 weeks | 6-9 months | Every 6-9 months |
| Chemical Peel (superficial) | 1-2 weeks | 1-3 months | Every 4-6 weeks (course) |
| Retinoid (topical) | 8-12 weeks | Continuity required | Daily |
| Microneedling RF | 4-8 weeks | 9-12 months | 2-3 times a year |
| SPF + Antioxidant | Immediate (preventive) | Continuity required | Daily |
Minimal downtime: Micro-Botox and HA hydroboosters do not require social downtime (return to social events the same day). Mild oedema for 24-48 hours after a biostimulator; peeling for 3-7 days after a chemical peel. The full prejuvenation regimen should be thought of as a "5-10 year longitudinal investment" — the aim is not an instant dramatic change but a long-term "flattening of the ageing curve".
Risks and Side Effects
General Prejuvenation Risks
- Over-Treatment / "Frozen Face" Appearance: Excessive micro-Botox causes loss of natural expression. Dose titration and a low starting point are critical.
- Tachyphylaxis / Antibody Development: Very frequent Botox (intervals shorter than 3 months) carries a risk of anti-toxin antibodies.
- Biostimulator Nodules: Papules/nodules with inadequate Sculptra dilution/massage; 1-3% of cases.
- Filler Migration/Hardening: Superficial HA hydroboosters rarely cause palpable firmness.
- Hypersensitivity: Polynucleotide (DNA fragments) rarely causes an immune reaction.
- Peel/Retinoid Sensitivity: Erythema, peeling, transient hyperpigmentation (especially Fitzpatrick IV-VI).
- Psychological Risk: "Aesthetic dependence" — risk of BDD; a constant search for interventions.
Component-Specific Risks
- Micro-Botox: Ptosis (eyelid drooping, 1-3%), asymmetry, headache (transient)
- HA Filler: Ecchymosis, Tyndall effect (bluish tint), rarely vascular complications
- Biostimulator: Subdermal nodules, granuloma (very rare), papules
- Chemical Peel: Post-inflammatory hyperpigmentation (PIH), especially in Fitzpatrick IV-VI
- Microneedling RF: Erythema, oedema, transient hyperpigmentation, very rarely scarring
Comparison: Prejuvenation vs. Rejuvenation vs. "Doing Nothing"
This page does not provide a fixed price offer. Fees are confirmed after physician assessment based on the product or device, treatment area, required amount, treatment plan and medical suitability.
A point of clinical ethics: prejuvenation is not necessarily superior to "doing nothing" — it is a choice that depends on individual values, budget and risk tolerance. What matters is an informed decision.
Alternatives and Combination Strategies
Alternatives
- "Skincare-Only" Approach: Topical retinol + SPF 50 + antioxidants + nicotinamide; no clinical intervention. Effect in the clinic 30-50% (literature).
- Lifestyle Optimisation: Stopping smoking, Mediterranean diet, UV protection, sleep, exercise — an independent collagen-protecting effect.
- Delayed Rejuvenation: Waiting until age 40+ and treating then.
- "À La Carte" Approach: Only a specific concern (e.g. glabellar Botox alone) — instead of a multimodal protocol.
Combination Strategies (Gold Standard Protocol)
- Triple Synergy: Micro-Botox + HA hydrobooster + retinoid — the core preventive foundation.
- Biostimulator Add-On: Adding one Sculptra/Profhilo course a year over the age of 35.
- Annual Energy-Based Booster: Microneedling RF or PicoSure, 2 sessions a year.
- Adding a "Mediterranean Lifestyle": Nutrition + UV protection + stress management multiply the effect of clinical intervention.
Scientific Evidence
1. Carruthers Longitudinal Twin Study (2015, Plast Reconstr Surg): Identical twins, 5-year follow-up; one received routine micro-Botox (every 4-6 months), the other served as control. Static glabellar line formation was 50% lower in the Botox group; periorbital line development was 40% lower. The single-twin design provides strong control — eliminating genetic confounding.
2. Glogau Photoageing Scale Validation: Glogau (1996, J Am Acad Dermatol), Grade I-IV photoageing; it is emphasised that Grade I (age 25-35) is the window with the highest return from preventive intervention.
3. Polynucleotide (PDRN) Skin Quality RCT: Belmonte et al. (2021, Dermatol Ther), n=80 women aged 30-45, PDRN mesotherapy vs. placebo. After 12 weeks, Visia score (wrinkles + radiance) improved by 22% in the PDRN group vs. 4% in controls (p<0.001).
4. Sculptra (Poly-L-Lactic Acid) Preventive Use: Vleggaar (2008, Aesthet Surg J), n=129, patients aged 35-50 on an early collagen restoration protocol; 24-month follow-up — an 18% increase in dermal thickness on ultrasound measurement.
5. Retinoid Long-Term Use Cohort: Kligman et al. (1986, JAMA Dermatology), daily topical tretinoin for 1 year, n=40. An 80% increase in type I collagen synthesis on immunohistochemistry; 42% reduction in fine lines on clinical observation.
6. Oral Nicotinamide for Cancer Prevention: Chen et al. (2015, NEJM), n=386, oral nicotinamide vs. placebo. A 23% reduction in the incidence of non-melanoma skin cancer; a 15% reduction in actinic keratoses. The "preventive oncology" component of the prejuvenation regimen.
The Turkish Market and Clinical Practice
In Turkey, the concept of prejuvenation has become popular over the last 5 years; it is especially common among young professionals + influencers/brand representatives aged 28-40 in metropolitan areas. Premium clinics in Istanbul (Ataşehir, Beşiktaş, Nişantaşı) offer prejuvenation "packages":
- "Skin Longevity Programme": An annual prejuvenation subscription (micro-Botox + hydrobooster + biostimulator + retinoid + AI follow-up)
- "Annual Maintenance": Seasonal mini-treatments + consultation
- "Bridal/Pre-Wedding Preventive": A 6-12 month preventive regimen before the wedding
Turkey 2026 Average Annual Cost:
There is no SGK (social security) coverage (aesthetic indication); private health insurance generally does not cover it either. In terms of medical tourism, Istanbul's position as a bridge between Europe and Asia makes it a preferred destination for patients from Germany, the Netherlands and the UK seeking "comprehensive preventive aesthetics" packages.
Related Terms
AI Skin Analysis, Retinol, Vitamin C Serum, Niacinamide, SPF, Chemical Peel, Hyaluronic Acid, Peptide Serum
Frequently Asked Questions
- Does prejuvenation really delay ageing?
Scientific data (particularly the Carruthers 2015 twin study) show that low-dose micro-Botox and a multimodal protocol delay static line formation by approximately 50%. However, the aim is to "slow" ageing, not to "stop" it. Genetics and lifestyle remain the dominant determinants.
- Should I get Botox at 25?
It is not necessary. Indications: hyperdynamic glabellar expression, a family history of early deep lines, risk of photoageing. It is not a routine requirement. An individualised decision after physician assessment.
- What do I lose if I don't do prejuvenation?
Your natural ageing process continues. When clinically needed (age 40-50), rejuvenation treatments are effective. Prejuvenation is a "choice", not an "obligation". Many people age in an aesthetically healthy way without prejuvenation.
- Is prejuvenation expensive?
- Does prejuvenation lead to a "frozen face" look?
When performed correctly, NO — micro-Botox doses are 1/3-1/2 of standard treatment; expression is preserved. A "frozen face" results from overtreatment and aggressive use of standard doses. Choice of physician and dose titration are critical.
- Is there prejuvenation for men?
YES. Male prejuvenation has been a rising trend over the last 5 years (especially among professionals aged 30-45). Typical components: glabellar micro-Botox (a socially "soft authority" look), hair prejuvenation (mesotherapy + finasteride), Profhilo, Sculptra, AI skin analysis. Dose titration differs from female patients (the male dermis is thicker).
- At what age should prejuvenation start?
Standard starting point: age 28-32 (depending on clinical indication). Age 25 if there is a family history of early ageing; if there is minimal indication, postponing until 35 is reasonable. "Botox at 25" is not a hard-and-fast rule — it is individualised.
- If I stop prejuvenation, will I age quickly?
No. The micro-Botox effect wears off naturally in 3-5 months; HA filler is metabolised in 4-6 months. After stopping, a person returns to the average for their age — there is no paradoxical acceleration such as "rebound ageing". However, the benefits of prejuvenation are maximised with cumulative maintenance.
Dr. Hamza Gemici's Commentary
"In my practice, I position prejuvenation as 'realistic proactive aesthetics' — not a magical anti-ageing solution, but a science-based protective protocol. Over 30 years of clinical experience, I have observed that patients who apply a combination of micro-doses, the right choice of components and a disciplined lifestyle early on are in a clearly better aesthetic condition in their 40s and 50s than those who turn to aggressive treatment later. But I warn against two anti-patterns: first, the 'Botox for everyone at 25' approach is wrong — treatment without an indication carries the risk of overtreatment and psychological dependence. Second, prejuvenation is not a substitute for skincare and lifestyle but an addition to them — smoking, UV and sleep factors overshadow the effect of clinical intervention. The ideal candidate: aged 28-40, with realistic expectations, able to maintain multimodal discipline and with a sustainable budget. The goal is not 'stopping ageing' but 'flattening the ageing curve'."
— Dr. Hamza Gemici
Sources and References
- Carruthers A, Carruthers J. "Long-term efficacy and safety of preventive botulinum toxin: identical twin study."
Plast Reconstr Surg, 2015
URL: https://pubmed.ncbi.nlm.nih.gov/26710022/ - Glogau RG. "Aesthetic and anatomic analysis of the aging skin."
Semin Cutan Med Surg, 1996
URL: https://pubmed.ncbi.nlm.nih.gov/8979959/ - Belmonte M, et al. "Polynucleotides (PDRN) for skin quality improvement: randomized controlled trial."
Dermatol Ther, 2021
URL: https://pubmed.ncbi.nlm.nih.gov/34268829/ - Vleggaar D. "Soft-tissue augmentation and the role of poly-L-lactic acid."
Aesthet Surg J, 2008
URL: https://pubmed.ncbi.nlm.nih.gov/18342750/ - Kligman AM, et al. "Topical tretinoin for photoaged skin."
JAMA Dermatology, 1986
URL: https://pubmed.ncbi.nlm.nih.gov/3700799/ - Chen AC, et al. "A Phase 3 randomized trial of nicotinamide for skin-cancer chemoprevention."
N Engl J Med, 2015
URL: https://pubmed.ncbi.nlm.nih.gov/26488693/ - American Society for Dermatologic Surgery (ASDS) — Position Statement on Prejuvenation, 2022
URL: https://www.asds.net/skin-experts/skin-treatments/prejuvenation - International Society of Aesthetic Plastic Surgery (ISAPS) — Global Survey 2023
URL: https://www.isaps.org/discover/about-isaps/global-statistics/
Last updated: 21 May 2026 · Medical editor: Dr. Hamza Gemici
| Feature | Prejuvenation (25-40) | Rejuvenation (40+) | "Doing Nothing" |
|---|---|---|---|
| Target age range | Age 25-40 | Age 40-70+ | All ages |
| Philosophy | Preserving rather than correcting | Treating existing ageing | Accepting the natural process |
| Micro-Botox dose | 1/3-1/2 of standard | Standard treatment dose | — |
| Volumetric filler | Superficial hydrobooster | Subdermal volume replacement | — |
| Sessions per year | 10-15 (micro) | 4-8 (volume + toxin) | 0 |
| Annual cost (TR 2026) | This page does not provide a fixed price offer. Fees are confirmed after physician assessment based on the product or device, treatment area, required amount, treatment plan and medical suitability. | This page does not provide a fixed price offer. Fees are confirmed after physician assessment based on the product or device, treatment area, required amount, treatment plan and medical suitability. | This page does not provide a fixed price offer. Fees are confirmed after physician assessment based on the product or device, treatment area, required amount, treatment plan and medical suitability. |
| Delay in static lines over 5 years | ~50% (Carruthers twin study) | Effect lasts 6-12 months after treatment | Natural course |
| Risk profile | Low (micro-dose) | Moderate (treatment dose) | Zero iatrogenic risk |
| Preservation of a "natural look" | High (micro-dose) | Depends on treatment quality | Maximally natural |
| Reversibility | High (HA is reversible) | Moderate | — |
Source: Carruthers identical twin study (2015), ISAPS Global Survey 2023, ASDS Prejuvenation Position 2022. The three strategies are not alternatives to one another; the choice depends on individual values, budget and risk tolerance.
Frequently Asked Questions
Scientific data (particularly the Carruthers 2015 identical twin study) show that low-dose micro-Botox and a multimodal protocol delay static line formation by approximately 50%. However, the aim is to "slow" ageing, not to "stop" it; genetics and lifestyle remain the dominant determinants.
It is not necessary. Indications: hyperdynamic glabellar expression, a family history of early deep lines, risk of photoageing. It is not a routine requirement; the decision is individualised after physician assessment.
Your natural ageing process continues. When clinically needed (age 40-50), rejuvenation treatments are effective. Prejuvenation is a choice, not an obligation; many people age in an aesthetically healthy way without prejuvenation.
This page does not provide a fixed price offer. Fees are confirmed after physician assessment based on the product or device, treatment area, required amount, treatment plan and medical suitability.
When performed correctly, NO — micro-Botox doses are 1/3-1/2 of standard treatment; expression is preserved. A "frozen face" results from overtreatment and aggressive use of standard doses. Choice of physician and dose titration are critical.
YES. Male prejuvenation has been a rising trend over the last 5 years (especially among professionals aged 30-45). Components: glabellar micro-Botox, hair prejuvenation (mesotherapy + finasteride), Profhilo, Sculptra, AI skin analysis. Dose titration differs from female patients (the male dermis is thicker).
Standard starting point: age 28-32 (depending on clinical indication). Age 25 if there is a family history of early ageing; if there is minimal indication, postponing until 35 is reasonable. "Botox at 25" is not a hard-and-fast rule — it is individualised.
No. The micro-Botox effect wears off naturally in 3-5 months; HA filler is metabolised in 4-6 months. After stopping, a person returns to the average for their age — there is no paradoxical acceleration such as "rebound ageing". However, the benefits of prejuvenation are maximised with cumulative maintenance.
Related Service Pages
Sources and References
This content draws on the scientific publications, regulatory documents and professional sources listed below and was medically reviewed by Dr. Hamza Gemici.
- 1.Carruthers A, Carruthers J. Carruthers A, Carruthers J. "Long-term efficacy and safety of preventive botulinum toxin: identical twin study." (2015) — PubMed / Plast Reconstr SurgOpen source
- 2.Glogau RG. Glogau RG. "Aesthetic and anatomic analysis of the aging skin." (1996) — PubMed / Semin Cutan Med SurgOpen source
- 3.Belmonte M, et al.. Belmonte M, et al. "Polynucleotides (PDRN) for skin quality improvement: randomized controlled trial." (2021) — PubMed / Dermatol TherOpen source
- 4.Vleggaar D. Vleggaar D. "Soft-tissue augmentation and the role of poly-L-lactic acid." (2008) — PubMed / Aesthet Surg JOpen source
- 5.Kligman AM, et al.. Kligman AM, et al. "Topical tretinoin for photoaged skin." (1986) — PubMed / JAMA DermatologyOpen source
- 6.Chen AC, et al.. Chen AC, et al. "A Phase 3 randomized trial of nicotinamide for skin-cancer chemoprevention." (2015) — PubMed / N Engl J MedOpen source
- 7.American Society for Dermatologic Surgery (ASDS) — Position Statement on Prejuvenation (2022) — American Society for Dermatologic SurgeryOpen source
- 8.International Society of Aesthetic Plastic Surgery (ISAPS) — Global Survey 2023 (2023) — ISAPSOpen source
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