I. Practical Summary: Key Strategies for Healthy, Young-Looking Skin
(a) Introduction
This information review aims to provide science-based information on maintaining skin health and slowing down the aging process. The skin, the largest organ in our body, is a vital protective barrier and reflects our overall health. Skin aging is a natural and complex process, influenced by internal factors such as genetics and time, and external factors such as sun exposure and lifestyle. This review will address the biological mechanisms of skin aging and present prevention and correction strategies based on current scientific research and insights from the field of health and longevity.
(b) The Pillars of Skin Health
Sun protection is a must: it is the most important pillar in preventing premature skin aging (photoaging) and skin cancer(1). It is important to use a broad-spectrum sunscreen (which protects against both UVA and UVB rays) with an SPF of at least 30 every day, year-round.(3) Some experts prefer mineral sunscreens (containing zinc oxide and/or titanium dioxide) due to their safety profile.(5) In addition, seek shade during peak sun hours (around 10:00 AM to 4:00 PM), wear protective clothing (with a UPF rating of 30 or higher), a wide-brimmed hat, and sunglasses.(3) Nourish from within: Nutrition plays a significant role in skin health.(10) It is recommended to adopt a diet based on whole foods and rich in antioxidants (fruits, vegetables), healthy fats (such as omega-3 fatty acids), and consume sufficient amounts of water.(15) Ensure adequate intake of essential micronutrients for skin health, including vitamins A, C, D, E, zinc, and magnesium(10).
Targeted nutritional supplements: Based on individual needs and risk factors, and after critical evaluation(20), scientifically based supplements may be considered:
Collagen hydrolysate (2.5-10 g/day): Studies indicate improved skin moisture and elasticity and reduced wrinkles after consistent use (at least 90 days)(22).
Nicotinamide (a derivative of vitamin B3, 500 mg twice daily): has been shown to reduce precancerous skin lesions (actinic keratosis) and non-melanoma skin cancers (NMSC) in high-risk populations, likely by supporting DNA repair and reducing sun-induced immunosuppression.(24)
Additional: Carotenoids (lycopene, beta-carotene), polyphenols (such as Polypodium Leucotomos extract 25), vitamin C/E, and omega-3 fatty acids may contribute to internal protection against sun damage, but are not a substitute for external protection.(14)
Proven Topical Treatments: To repair existing damage and signs of aging:
Retinoids (vitamin A derivatives): Tretinoin (prescription, 0.025%-0.1%) and tazarotene (prescription, 0.1%) are considered The “gold standard” for photoaging treatment, with strong evidence of improving wrinkles, pigmentation, and skin texture by regulating gene transcription, encouraging collagen production, and reducing its breakdown(27)
Topical vitamin C (10-20% ascorbic acid): A potent antioxidant that supports collagen production and helps lighten pigmentation. Its effectiveness is highly dependent on the stability and permeability of the formulation(32)
Procedural cosmetic interventions: In addition to topical treatments and lifestyle strategies, cosmetic dermatology offers a variety of procedural interventions for advanced correction of signs of aging and skin damage. These include injectables (such as Botox to smooth expression lines and fillers to restore volume), energy-based treatments (such as lasers for skin resurfacing, pigmentation, and vascular treatment), chemical peels, and microneedling to improve texture and encourage Collagen formation. These procedures, performed by qualified professionals, complement daily care and allow for targeted treatment of specific aesthetic problems.
(c) Summary table: Evaluation of key skin health interventions
Table 1: Summary of evidence for key skin health interventions
Intervention Main outcomes Strength of evidence
(in humans/in vitro/in vitro)
Under key considerations/dosage Relevant sources
UV filter
Dose (SPF)
+30 Prevention of damage
from UVA-B rays
High risk of cancer
(skin)
Daily use,
Repeated application,
Preventive treatment
by
certain products
3
Topical tretinoin
(0.025-0.1%)
Softening (wrinkles),
(+pigmentation),
High collagen synthesis
Strong ingredient,
Gradual onset,
Sensitivity Sun/Night Use 27 Topical Vitamin C (Ascorbic Acid to Ascorbic Acid (10-20%) Antioxidant, Collagen Support, Pigment Lightening Moderate-High Stability and Complexity of Formula Radiation, Morning Use 32 Hydrolyzed Collagen Oral (2.5-10g/day) Hydration, Elasticity, Wrinkle Reduction Moderate-High Consistent Use (+90 days) Varies between sources, additional research needed 22 Oral Nicotinamide (500mg twice daily) Photoprotection (DNA repair) Sun Damage Reduction, NMSC/AK Reduction Moderate-High Mainly for High Risk Individuals 24 Dietary Antioxidants Prevent UVA Damage (Age Shield 45) Moderate Whole Food Consumption (Fruits, Vegetables) 37
Omega-3 fatty acids
(EPA >1
g/day) Anti-inflammatory, skin barrier support, photoprotection Potentially moderate Fish oil or sour 12
Water intake
Provides skin hydration
(indirect in pool
Low in base) Low-moderate Basic values
Sour, general health, direct effect on skin appearance Less proven 17
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II. Understanding skin aging: Why and how our skin changes
(a) Intrinsic vs. extrinsic aging
Skin aging is a complex process influenced by a combination of intrinsic and extrinsic factors(42). Understanding the differences between these two aging pathways is essential for developing effective prevention and correction strategies.
Intrinsic aging: This is the natural, chronological aging process that occurs over time and is driven primarily by Genetics and internal metabolic factors(1). This process is inevitable and manifests itself in thinner, drier skin with fine lines, a gradual loss of elasticity and atrophy (degeneration) of the dermis. The main mechanisms include a decrease in the rate of cell division (proliferation) in the basal layer of the epidermis, leading to a thinner epidermis and a reduction in the contact area between the dermis and the epidermis, which impairs the supply of nutrients. This phenomenon, known as cellular senescence, is