Did you know that as much as 80% of skin aging is caused by oxidative stress, which is promoted by ultraviolet rays? This invisible damage process affects your skin every day, rapidly bringing on wrinkles, pigmentation spots, and other signs of aging. But the real problem lies much deeper than what we see in the mirror.
Oxidative stress causes widespread damage to the entire body, and over time this process can lead to a deterioration in general health, accelerated aging processes, and an increased risk of cardiovascular diseases. What is oxidative stress? First of all, it is a process caused by free radicals – unstable molecules that seek to "take" a missing electron. Free radicals are believed to be involved in the development of about 60 conditions dangerous to our health, including Alzheimer's disease and arthritis.
These processes are particularly dangerous for your skin. The damage caused by free radicals leads to inflammation, which prevents the skin from functioning effectively, causing problems such as acne, hyperpigmentation, and cellular damage, but antioxidants can neutralize this damage. They eliminate the oxidative stress caused by free radicals and simultaneously prevent its occurrence.
What is oxidative stress and how does it affect the skin?
It is a state of the body when the balance between free radicals and antioxidants is disrupted. During this imbalance, the production of free radicals exceeds the body's ability to neutralize them, leading to oxidative damage to cells and tissues.
Free radicals are formed naturally; they are by-products of metabolic processes, such as cellular respiration. An excess of them can lead to serious problems. Oxidative stress is significant not only in the skin aging process but also as a cause of most chronic diseases and natural human aging processes.
Free radicals attack our body daily, relentlessly and as invisible enemies. To understand how they work and why they are harmful, one must first understand their origin and nature.
Free radicals and their effects on cells
Free radicals are unstable molecules with an unpaired electron. A normal molecule is stable only when it has an even number of electrons; due to the missing electron, free radicals become highly reactive and constantly try to steal electrons from surrounding molecules, thereby causing a chain reaction.
The main forms of free radicals found in the body:
- Superoxide anion (O₂⁻)
- Hydroxyl anion (OH⁻)
- Hydrogen peroxide (H₂O₂)
- Peroxynitrite (ONOO⁻)
These molecules harm cells by damaging their membranes, proteins, enzymes, DNA, and nuclear membranes. These damages can lead to DNA mutations, cellular dysfunction, or even cell death.
What is oxidative stress: a brief explanation
It is a state of the body when the balance between free radicals and antioxidants is disrupted. During this imbalance, the production of free radicals exceeds the body's ability to neutralize them, leading to oxidative damage to cells and tissues.
Free radicals are formed naturally; they are by-products of metabolic processes, such as cellular respiration. An excess of them can lead to serious problems. Oxidative stress is significant not only in the skin aging process but also as a cause of most chronic diseases and natural human aging processes.
How does oxidative stress cause skin damage?
In the epidermis, oxidative stress can increase transepidermal water loss, causing the skin to lose moisture. Irregular melanin distribution occurs, which gives the skin an uneven tone, cellular metabolism slows down, the skin becomes dull, and the epidermal layer thins.
In the dermis, oxidative stress disrupts the synthesis of collagen, elastin, and proteoglycans, which weakens the skin's structure, reduces its firmness, elasticity, and tightness, thus promoting faster wrinkle formation, skin dehydration, and sagging.
Oxidative stress also damages telomeres – protective "caps" at the ends of chromosomes that protect genetic information from mutations. When telomeres shorten, DNA becomes vulnerable, cells stop dividing, begin to age, and die.
Main causes of oxidative stress
The effects of daily life on the body cause oxidative stress when the production of free radicals exceeds natural defense systems. These factors constantly affect our body, increasing the risk of damage.
1. UV rays and sun exposure
Ultraviolet radiation is one of the strongest causes of oxidative stress. Of the total UV amount reaching the Earth's surface, about 94% is UVA and 6% is UVB rays. UVB rays only affect the epidermis, causing redness, but UVA penetrates deeper and is the main cause of skin photoaging. Prolonged exposure to UV rays causes cellular damage by stimulating the production of reactive oxygen species. This is the main reason why UV radiation is associated with premature skin aging and an increased risk of skin cancer.
2. Environmental pollution and smoking
Air pollution, fine particulate matter, and toxic gases promote the production of free radicals in the respiratory tract. Tobacco smoke is rich in free radicals and chemical compounds that increase oxidative stress in the blood and cause systemic cellular damage. Cigarette smoke, air pollution, heavy metals, pesticides, and microplastics are significant external sources of oxidative stress.
Smoking also constricts blood vessels, leading to tissue ischemia, and insufficient oxygen reaching the skin. These processes stimulate an enzyme that breaks down collagen in the skin, which maintains its firmness.
3. Poor nutrition and stress
A diet rich in fats and refined carbohydrates increases oxidative stress. In cases of obesity, it becomes chronic and disrupts metabolism – increasing the risk of insulin resistance, type II diabetes, cardiovascular diseases, and non-alcoholic fatty liver disease. Chronic and prolonged stress reduces the body's ability to produce antioxidants and increases oxidative stress.
4. Internal body processes
Natural body processes also cause oxidative stress:
- Mitochondria produce energy from nutrients, and during this process, some electrons react with oxygen, forming superoxide – one of the main forms of reactive oxygen species.
- Immune system activation – in case of infection, neutrophils and macrophages produce reactive oxygen species as a defense mechanism against pathogens.
- Enzyme activity – during the activity of some enzymes, such as cytochrome P450, NADPH oxidase, and xanthine oxidase, reactive oxygen species are released as a by-product.
As the body ages, free radical production remains constant or increases, while antioxidant production decreases, thus naturally increasing the level of oxidative stress.
The influence of oxidative stress on skin aging
At the molecular level, oxidative stress begins to destroy the skin long before we notice the first signs of aging in the mirror. This chain of invisible damage eventually turns into visible skin changes that we notice daily.
Reduction of collagen and elastin
Oxidative stress directly affects the protein structures in the dermis. Free radicals cause DNA strand breaks, protein fragmentation, and lipid peroxidation – processes that directly damage collagen and elastin fibers, thus oxidative stress in the dermis can slow down the synthesis of collagen, elastin, and proteoglycans, weakening the skin's structure and reducing its firmness and elasticity.
Every year, starting from the age of 25, the body produces less and less collagen (1% per year), and elastin production begins to slow down as early as 20 years of age. Although the skin can synthesize new collagen, it is more difficult for it to restore elastin, as its metabolic rate is low and slow, making it particularly vulnerable over time.
Wrinkle formation and skin sagging
Oxidative stress accelerates skin aging processes, leading to faster wrinkle formation, dry skin, dullness, and sagging. Neglected skin, unprotected from oxidative stress, ages 40% faster than properly cared for skin.
Long-term exposure to free radicals causes mitochondrial aging. When normal mitochondrial function is disrupted, cells do not receive enough energy and begin to die by apoptosis. At the same time, the entire skin tissue ages, leading to outwardly sagging skin with deeper wrinkles.
Pigmentation spots and changes in skin color
Oxidative stress causes skin pigmentation disorders. Reactive oxygen species damage melanocytes – pigment-producing cells, leading to the appearance of pigmentation spots and age spots. Free radicals are one of the three main factors promoting pigmentation.
At the same time, skin microcirculation decreases, and the skin surface is not as effectively supplied with nutrients and oxygen. Due to these changes, the skin loses its youthful pink hue and radiance, becoming paler and grayish.
Weakening of the skin barrier
Oxidative stress disrupts the skin's barrier function, which is the first line of defense against environmental factors. Damage to the skin barrier increases transepidermal water loss and weakens lipid barriers, creating a cycle of dehydration and impaired skin function.
With a weakened protective skin function, it becomes more permeable to environmental factors, which can lead to inflammation or even chronic skin problems. The skin becomes more vulnerable, capillaries break faster, redness appears, and wounds heal with more difficulty due to weakened immune function.
The role of antioxidants and how they help
Antioxidants are a true savior in the fight against oxidative stress. Unlike free radicals, antioxidants are stable molecules that can donate their electrons, protecting healthy cells from damage.
How do antioxidants neutralize free radicals?
Antioxidants act as a protective shield that can donate an electron to a free radical, thereby stabilizing it and reducing potential damage. This process is like a "sacrifice" where antioxidant particles neutralize free radicals instead of your body's cells becoming their victims. This mechanism helps to stop the chain reaction of oxidative stress, preventing damage to vital molecules.
Key antioxidants for the skin: vitamin C, E, Q10
Vitamin E is an essential fat-soluble antioxidant that neutralizes free radicals, effectively protects the skin from oxidative stress, and helps maintain skin moisture levels. It not only protects the skin from damage but also helps to restore it.
Vitamin C is a powerful antioxidant that brightens pigmentation spots, stimulates collagen production, and reduces the appearance of wrinkles. It neutralizes free radicals, protecting the skin from UV rays and pollution.
Coenzyme Q10 is a natural antioxidant that supports skin regeneration and elasticity. It is particularly important because the concentration of coenzyme Q10 in the skin decreases with age. Coenzyme Q10 protects against wrinkles, stimulates the production of collagen and elastin in the skin.
Natural sources of antioxidants in food
The best way to supply the body with antioxidants is through a varied diet. The highest amounts of antioxidants are found in:
- Berries (especially blueberries, raspberries, blackcurrants) – rich in anthocyanins
- Green vegetables (spinach, broccoli, kale) – sources of vitamin C, E
- Citrus fruits – source of vitamin C
- Nuts and seeds – source of vitamin E
- Green tea – contains catechins, especially epigallocatechin gallate (EGCG)
Antioxidants in cosmetics: are they effective?
Creams with antioxidants can inhibit wrinkle formation and increase skin elasticity. Antioxidants in cosmetics are not just a marketing tool but ingredients whose effectiveness is scientifically proven.
Although ingested antioxidant molecules are distributed throughout the body and only a small part reaches the skin, direct use of antioxidants in cosmetic products can be a more effective way to protect the skin from oxidative stress.
Natural vs. synthetic antioxidants
Natural antioxidants are often better absorbed by the skin than synthetic ones: for example, naturally derived vitamin E (alpha-tocopherol) is the most biologically active form of this vitamin in the human body.
The stability of antioxidants in cosmetic preparations poses challenges for manufacturers. Vitamin C, for example, reacts strongly to heat, light, air, and other chemicals, thus it can easily lose its antioxidant properties. For this reason, manufacturers use various technologies to preserve the effectiveness of antioxidants in products.
Conclusion
Oxidative stress is undoubtedly one of the most important skin aging processes, damaging the skin's structure at a molecular level much earlier than you notice the first signs of aging. However, knowledge about this process gives you the opportunity to effectively combat its effects. Antioxidants become your strongest ally in this fight – they neutralize free radicals, protecting cells from damage.
However, consuming antioxidants through food alone is not enough for complete skin protection. The smartest strategy is a comprehensive approach. First, include more antioxidant-rich foods in your diet: berries, green vegetables, citrus fruits, and nuts. Also, use skincare products containing vitamins C, E, and coenzyme Q10. Protect yourself from sunlight by using protective measures even on cloudy days, as ultraviolet rays are the main cause of oxidative stress.
Remember – protecting your skin from oxidative stress should be a daily practice, not a one-time measure. Constant attention to your skin's health can slow down aging processes and protect it from damage caused by environmental factors, so incorporating antioxidants into your skincare routine is a wise decision that will help you maintain youthful, radiant, and healthy skin for many years to come.
