For a long time, sun protection was summed up in a simple recommendation: apply sunscreen.
And let's be clear: daily sun protection remains essential.
UV filters help protect the skin against some of the rays responsible for photoaging, hyperpigmentation, collagen degradation, and, in the long term, premature skin aging.
But today, science shows us a more complex reality.
Skin aging is not solely determined by what strikes the skin from the outside. It also depends on the biological capacity of the skin to defend itself, adapt, and repair.
In other words, the real question is no longer just:
How well do you protect your skin?
But also:
How biologically resilient is your skin?
At Maison Sahéo, we believe that skin longevity relies on a two-tiered approach.
1. External protection — what UV really does to your skin
Every day, the skin is exposed to invisible aggressions: UV-A rays (deep aging), UV-B rays (burns), blue light, pollution, heat, environmental stress.
These factors increase oxidative stress, free radicals (ROS), inflammation, and the activity of MMPs (matrix metalloproteinases)—enzymes that are particularly problematic because they degrade collagen, elastin, and the extracellular matrix.
It is this progressive destruction that contributes to:
- loss of firmness
- wrinkles and skin laxity
- spots and hyperpigmentation
- a slower recovery after aesthetic treatments
A review on natural and solar aging of the skin (Rittié & Fisher, Cold Spring Harb Perspect Med, 2015) documents that exposure to UV-A induces significant activation of MMPs in the dermis, leading to accelerated degradation of collagen and elastin—even in the absence of visible sunburn.
Sunscreen remains the first line of defense.
But it doesn't do everything.
2. Why sunscreen alone is no longer enough
Even with excellent sun protection, some radiation gets through, free radicals continue to form, inflammation can be activated, and collagen can continue to degrade.
This is where a concept still little known to the general public comes into play: internal photoprotection.
Internal photoprotection never replaces sunscreen. It works differently. Instead of blocking UV rays, it helps the body neutralize free radicals, reduce cellular damage, limit inflammation, protect collagen, and improve skin repair.
External protection reduces the aggression.
Internal protection enhances the skin's biological response to this aggression.
It is this combination that interests us at Maison Sahéo.
The inside-out skin defense system according to Maison Sahéo
Resilient skin relies on several complementary biological mechanisms. Here are the best-documented actives to support this defense from within.
Resveratrol — cellular longevity and antioxidant defense
Resveratrol is one of the most studied polyphenols in longevity medicine. It helps support antioxidant defense, sirtuins (cellular longevity), mitochondrial protection, and reduction of chronic inflammation.
For the skin, this can mean less oxidative stress, less collagen degradation, and better resistance to photoaging. A review on resveratrol as a cosmetic and dermatological active (Ratz-Łyko & Arct, J Cosmet Laser Ther, 2019) documents that resveratrol can inhibit certain MMPs involved in collagen destruction after UV exposure — a mechanism particularly relevant for internal photoprotection.
Ceramides — strengthening the barrier from within
Ceramides are fundamental lipids of the skin barrier. When their levels decrease, the skin loses more water, becomes more sensitive, inflames more easily, and recovers less effectively. A weakened barrier means skin is more vulnerable to all external aggressions.
A review on ceramides and skin health (Yong et al., Exp Dermatol, 2025) documents that ceramides play a fundamental role in creating the water barrier, preserving hydration, regulating inflammation, and improving skin functions — with established clinical applications for repairing barrier defects and enhancing skin resilience.
Polypodium leucotomos — internal support against UV
Among the internal photoprotection actives, Polypodium leucotomos is probably one of the most interesting. This plant extract is studied for its ability to reduce UV-induced damage, limit oxidative stress, decrease post-UV inflammation, and reduce certain DNA damage.
A review published in Photodermatology, Photoimmunology & Photomedicine (2015) documents that its antioxidant activity — primarily driven by caffeic acid and ferulic acid — helps control skin responses to UV erythema, intercept inflammatory mechanisms, and improve the integrity of cell membranes and the expression of elastin.
Important: this is not an oral sunscreen. It is an additional layer of biological defense.
Carotenoids — the internal antioxidant shield
Carotenoids gradually accumulate in the skin and act as an internal antioxidant reserve. Among the most interesting:
-
Astaxanthin — extremely powerful antioxidant, protects cell membranes, reduces oxidative stress, supports skin elasticity
-
Lycopene — very interesting for photoaging and UV protection
-
Lutein and zeaxanthin — known for eye health, also useful against stress induced by blue light
-
Beta-carotene — precursor of vitamin A, supports cell regeneration
Dietary carotenoids — particularly lycopene and beta-carotene — help reduce skin sensitivity to UV and protect against photoaging through their antioxidant action in skin tissues.
Oral hyaluronic acid — deep hydration
Hyaluronic acid is not only topical. In oral supplement form, it can support skin hydration, elasticity, suppleness, and comfort for dehydrated skin. Well-hydrated skin appears plumper, more radiant, and more resistant to external aggressions.
L-Proline — structural support of collagen
Proline is a major amino acid in collagen. Collagen is particularly rich in glycine, proline, and hydroxyproline. Without these structural building blocks, it becomes more difficult to maintain a solid dermal matrix — and thus firm and resilient skin.
Grape seed extract and pine bark — polyphenolic protection
These plant extracts are particularly interesting for microcirculation, collagen protection, oxidative stress, and vascular health. They are often valued for supporting thin or redness-prone skin.
Zinc — repair and recovery
Zinc is essential for over 300 enzymatic reactions. It plays a key role in healing, tissue repair, immunity, inflammation control, and skin balance. It is particularly beneficial for inflammatory skin, adult acne, and post-procedure recovery.
Copper — quality of collagen and elastin
Copper is essential for lysyl oxidase, an enzyme crucial for structuring collagen and elastin. Collagen may be present… but without proper structuring, its mechanical quality decreases. Copper also supports antioxidant defense, repair, and the quality of dermal tissue.
Silicon — supporting architecture
Silicon contributes to the integrity of connective tissue, collagen structure, elasticity, and support of the extracellular matrix.
Collagen is the structure.
Silicon helps organize this structure.
The future of anti-aging is biological
Visible skin aging rarely results from a single factor. It is generally the combined consequence of UV damage, oxidative stress, chronic inflammation, collagen degradation, and barrier dysfunction.
That’s why the future of premium skincare will not be solely cosmetic.
It will be biological.
At Maison Sahéo, we believe in an integrated approach:
-
Protect — reduce external aggression
-
Strengthen — enhance biological resilience
-
Optimize recovery — support skin repair
Sunscreen protects your skin.
Your biology determines how it ages.
And this is precisely where true skin longevity begins.
Protect from the outside. Strengthen from the inside.
— Maison Sahéo
FAQ — Internal photoprotection and skin longevity
Does internal photoprotection replace sunscreen?
No. Internal photoprotection never replaces sunscreen. It works differently: instead of blocking UV on the surface, it helps the body respond better to damage that penetrates despite external protection — by neutralizing free radicals, limiting inflammation, and supporting cellular repair. The two approaches are complementary, not interchangeable.
What is Polypodium leucotomos and how does it work?
Polypodium leucotomos is a plant extract derived from a tropical fern, studied for its internal photoprotective properties. It reduces oxidative and inflammatory damage induced by UV, limits certain DNA damage, and is particularly interesting for skin prone to hyperpigmentation and PIH (post-inflammatory hyperpigmentation). It is not an oral sunscreen — it is an additional layer of biological defense.
Why does collagen degrade with sun exposure?
UV rays activate MMPs (matrix metalloproteinases), enzymes that degrade collagen, elastin, and the extracellular matrix. This process occurs even in the absence of visible sunburn — UV-A penetrates deeply into the dermis and triggers this inflammatory and oxidative cascade. It is one of the main causes of photoaging.
Is resveratrol useful for the skin?
Yes. Resveratrol is a polyphenol with well-documented antioxidant and anti-inflammatory properties. For the skin, it can help reduce oxidative stress, inhibit certain MMPs involved in collagen degradation after UV exposure, and support cellular longevity mechanisms via sirtuins. Its action is gradual and complementary to a targeted topical routine.
How long does it take to see the effects of internal photoprotection?
The effects of internal photoprotection are gradual and cumulative. Carotenoids, for example, accumulate in the skin over several weeks. The visible benefits — improved firmness, radiance, reduced sensitivity, and hyperpigmentation — are generally observed after 6 to 12 weeks of regular use, in synergy with daily sun protection and an appropriate topical routine.
Internal photoprotection and Maison Sahéo care: a synergy?
Absolutely. Our formulas based on PDRN and signaling peptides work on deep skin regeneration — by stimulating fibroblasts and collagen synthesis. By simultaneously reducing oxidative stress and inflammation through internal photoprotection, you optimize the skin's receptivity to topical actives — and thus the long-term effectiveness of your treatments.
Protecting your skin from the outside... and from the inside: internal photoprotection according to Maison Sahéo
For a long time, sun protection was summed up in a simple recommendation: apply sunscreen.
And let's be clear: daily sun protection remains essential.
UV filters help protect the skin against some of the rays responsible for photoaging, hyperpigmentation, collagen degradation, and, in the long term, premature skin aging.
But today, science shows us a more complex reality.
Skin aging is not solely determined by what strikes the skin from the outside. It also depends on the biological capacity of the skin to defend itself, adapt, and repair.
In other words, the real question is no longer just:
How well do you protect your skin?
But also:
How biologically resilient is your skin?
At Maison Sahéo, we believe that skin longevity relies on a two-tiered approach.
1. External protection — what UV really does to your skin
Every day, the skin is exposed to invisible aggressions: UV-A rays (deep aging), UV-B rays (burns), blue light, pollution, heat, environmental stress.
These factors increase oxidative stress, free radicals (ROS), inflammation, and the activity of MMPs (matrix metalloproteinases)—enzymes that are particularly problematic because they degrade collagen, elastin, and the extracellular matrix.
It is this progressive destruction that contributes to:
A review on natural and solar aging of the skin (Rittié & Fisher, Cold Spring Harb Perspect Med, 2015) documents that exposure to UV-A induces significant activation of MMPs in the dermis, leading to accelerated degradation of collagen and elastin—even in the absence of visible sunburn.
Sunscreen remains the first line of defense.
But it doesn't do everything.
2. Why sunscreen alone is no longer enough
Even with excellent sun protection, some radiation gets through, free radicals continue to form, inflammation can be activated, and collagen can continue to degrade.
This is where a concept still little known to the general public comes into play: internal photoprotection.
Internal photoprotection never replaces sunscreen. It works differently. Instead of blocking UV rays, it helps the body neutralize free radicals, reduce cellular damage, limit inflammation, protect collagen, and improve skin repair.
It is this combination that interests us at Maison Sahéo.
The inside-out skin defense system according to Maison Sahéo
Resilient skin relies on several complementary biological mechanisms. Here are the best-documented actives to support this defense from within.
Resveratrol — cellular longevity and antioxidant defense
Resveratrol is one of the most studied polyphenols in longevity medicine. It helps support antioxidant defense, sirtuins (cellular longevity), mitochondrial protection, and reduction of chronic inflammation.
For the skin, this can mean less oxidative stress, less collagen degradation, and better resistance to photoaging. A review on resveratrol as a cosmetic and dermatological active (Ratz-Łyko & Arct, J Cosmet Laser Ther, 2019) documents that resveratrol can inhibit certain MMPs involved in collagen destruction after UV exposure — a mechanism particularly relevant for internal photoprotection.
Ceramides — strengthening the barrier from within
Ceramides are fundamental lipids of the skin barrier. When their levels decrease, the skin loses more water, becomes more sensitive, inflames more easily, and recovers less effectively. A weakened barrier means skin is more vulnerable to all external aggressions.
A review on ceramides and skin health (Yong et al., Exp Dermatol, 2025) documents that ceramides play a fundamental role in creating the water barrier, preserving hydration, regulating inflammation, and improving skin functions — with established clinical applications for repairing barrier defects and enhancing skin resilience.
Polypodium leucotomos — internal support against UV
Among the internal photoprotection actives, Polypodium leucotomos is probably one of the most interesting. This plant extract is studied for its ability to reduce UV-induced damage, limit oxidative stress, decrease post-UV inflammation, and reduce certain DNA damage.
A review published in Photodermatology, Photoimmunology & Photomedicine (2015) documents that its antioxidant activity — primarily driven by caffeic acid and ferulic acid — helps control skin responses to UV erythema, intercept inflammatory mechanisms, and improve the integrity of cell membranes and the expression of elastin.
Important: this is not an oral sunscreen. It is an additional layer of biological defense.
Carotenoids — the internal antioxidant shield
Carotenoids gradually accumulate in the skin and act as an internal antioxidant reserve. Among the most interesting:
Dietary carotenoids — particularly lycopene and beta-carotene — help reduce skin sensitivity to UV and protect against photoaging through their antioxidant action in skin tissues.
Oral hyaluronic acid — deep hydration
Hyaluronic acid is not only topical. In oral supplement form, it can support skin hydration, elasticity, suppleness, and comfort for dehydrated skin. Well-hydrated skin appears plumper, more radiant, and more resistant to external aggressions.
L-Proline — structural support of collagen
Proline is a major amino acid in collagen. Collagen is particularly rich in glycine, proline, and hydroxyproline. Without these structural building blocks, it becomes more difficult to maintain a solid dermal matrix — and thus firm and resilient skin.
Grape seed extract and pine bark — polyphenolic protection
These plant extracts are particularly interesting for microcirculation, collagen protection, oxidative stress, and vascular health. They are often valued for supporting thin or redness-prone skin.
Zinc — repair and recovery
Zinc is essential for over 300 enzymatic reactions. It plays a key role in healing, tissue repair, immunity, inflammation control, and skin balance. It is particularly beneficial for inflammatory skin, adult acne, and post-procedure recovery.
Copper — quality of collagen and elastin
Copper is essential for lysyl oxidase, an enzyme crucial for structuring collagen and elastin. Collagen may be present… but without proper structuring, its mechanical quality decreases. Copper also supports antioxidant defense, repair, and the quality of dermal tissue.
Silicon — supporting architecture
Silicon contributes to the integrity of connective tissue, collagen structure, elasticity, and support of the extracellular matrix.
The future of anti-aging is biological
Visible skin aging rarely results from a single factor. It is generally the combined consequence of UV damage, oxidative stress, chronic inflammation, collagen degradation, and barrier dysfunction.
That’s why the future of premium skincare will not be solely cosmetic.
It will be biological.
At Maison Sahéo, we believe in an integrated approach:
Protect from the outside. Strengthen from the inside.
— Maison Sahéo
FAQ — Internal photoprotection and skin longevity
Does internal photoprotection replace sunscreen?
No. Internal photoprotection never replaces sunscreen. It works differently: instead of blocking UV on the surface, it helps the body respond better to damage that penetrates despite external protection — by neutralizing free radicals, limiting inflammation, and supporting cellular repair. The two approaches are complementary, not interchangeable.
What is Polypodium leucotomos and how does it work?
Polypodium leucotomos is a plant extract derived from a tropical fern, studied for its internal photoprotective properties. It reduces oxidative and inflammatory damage induced by UV, limits certain DNA damage, and is particularly interesting for skin prone to hyperpigmentation and PIH (post-inflammatory hyperpigmentation). It is not an oral sunscreen — it is an additional layer of biological defense.
Why does collagen degrade with sun exposure?
UV rays activate MMPs (matrix metalloproteinases), enzymes that degrade collagen, elastin, and the extracellular matrix. This process occurs even in the absence of visible sunburn — UV-A penetrates deeply into the dermis and triggers this inflammatory and oxidative cascade. It is one of the main causes of photoaging.
Is resveratrol useful for the skin?
Yes. Resveratrol is a polyphenol with well-documented antioxidant and anti-inflammatory properties. For the skin, it can help reduce oxidative stress, inhibit certain MMPs involved in collagen degradation after UV exposure, and support cellular longevity mechanisms via sirtuins. Its action is gradual and complementary to a targeted topical routine.
How long does it take to see the effects of internal photoprotection?
The effects of internal photoprotection are gradual and cumulative. Carotenoids, for example, accumulate in the skin over several weeks. The visible benefits — improved firmness, radiance, reduced sensitivity, and hyperpigmentation — are generally observed after 6 to 12 weeks of regular use, in synergy with daily sun protection and an appropriate topical routine.
Internal photoprotection and Maison Sahéo care: a synergy?
Absolutely. Our formulas based on PDRN and signaling peptides work on deep skin regeneration — by stimulating fibroblasts and collagen synthesis. By simultaneously reducing oxidative stress and inflammation through internal photoprotection, you optimize the skin's receptivity to topical actives — and thus the long-term effectiveness of your treatments.