Skincare products can be broadly divided into two classes: basic products, which primarily moisturize, protect, and maintain hydration, and active ingredient-oriented products, which specifically intervene in biological processes of the skin. In this second category, the selection, dosage, and combination of active ingredients determine whether a product delivers visible results or not.
The skin is the largest organ of the human body. It consists of the epidermis (outer skin), dermis (corium), and subcutis (subcutaneous tissue). For effective topical skincare, the dermis is particularly relevant – this is where fibroblasts (collagen-producing cells), blood vessels, hair follicles, and the structural proteins collagen and elastin are located. Many active ingredients aim to either strengthen the skin barrier of the epidermis or stimulate signaling processes in the dermis.
From about the age of 25, the body's own collagen production decreases by about one percent per year. At the same time, the skin's capacity to bind moisture decreases. This process is accelerated by external factors such as UV radiation, pollution, oxidative stress, and – particularly relevant for men – mechanical stress from daily shaving. Active ingredient-oriented skincare cannot reverse these processes, but it can measurably slow them down and reduce visible symptoms.
Peptides: Signaling Molecules with Scientific Substance
What are peptides?
Peptides are short chains of amino acids – the building blocks of the proteins collagen, elastin, and keratin. In skincare, they function as messenger substances: Applied to the skin, they signal to the fibroblasts in the dermis that repair is needed, thereby stimulating the new production of collagen and elastin.
Three main classes are distinguished:
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Signaling peptides (e.g., Palmitoyl Pentapeptide, GHK-Cu): Stimulate fibroblasts for collagen and elastin synthesis.
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Enzyme inhibitor peptides: Inhibit the breakdown of collagen by endogenous enzymes (matrix metalloproteinases).
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Neuromodulating peptides (e.g., Acetyl Hexapeptide): Act similarly to botulinum toxin at the level of skin tension, without being invasive.
What do the studies say?
For signaling peptides like Palmitoyl-Pentapeptide-4 (Matrixyl), clinical data is available: After 8–12 weeks of daily use, a controlled study reported a reduction in wrinkle depth of up to 45% compared to the placebo group. Another clinical study with GHK-Cu over 12 weeks showed a measurably increased dermal density and collagen production – with results that were better in this study than with Vitamin C or retinoic acid.
Biomimetics is the key concept: Biomimetic peptides mimic endogenous structures so that the skin does not recognize them as foreign substances. This makes them the most tolerable anti-aging active ingredients on the market – without the risk of irritation that can occur with highly concentrated retinol, for example.
In reality, topical peptides are not "miracle cures overnight," but with consistent use over several weeks, they are measurably effective: clinically measurable improvement in moisture, elasticity, and fine lines.
For whom are peptides particularly relevant?
Peptides are ideal for men's skin because:
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Shaving causes daily micro-injuries to the skin barrier. Anti-inflammatory peptides support repair.
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Men's skin is exposed to increased oxidative stress due to daily stress (sports, environment, UV).
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Peptides are suitable for all skin types and also for sensitive skin, unlike strong acids or high retinol concentrations.
The Bergamond & Birch Product: The BoosterLab No. 1337 – Peptide Firming Serum is a highly concentrated leave-on serum with biomimetic peptides and hyaluronic acid. It absorbs quickly, leaves no film, and can be layered under any day cream.
Hyaluronic Acid: The Skin's Water Magnet
How does hyaluronic acid work topically?
Hyaluronic acid (HA) is an endogenous glycosaminoglycan found in connective tissue, joint fluid, and skin. One of its outstanding biochemical properties: HA can bind up to 6,000 times its own weight in water. In the skin, it therefore acts as a natural water reservoir and contributes to firmness and elasticity.
Molecular weight is crucial for the depth of action:
High molecular HA forms a protective film on the skin surface and reduces transepidermal water loss (TEWL). Low molecular variants can penetrate deeper into the horny layers and achieve stronger hydrating effects. High-quality formulations, such as those used by Bergamond & Birch in anti-aging products, combine both molecular weights for a multi-layered effect.
What does science prove – and where does it stop?
Reputable sources clearly distinguish: Topically applied hyaluronic acid can smooth dehydration lines, make the skin appear plumper and more supple, and improve the skin's surface – as long as it is applied consistently.
What it cannot do: Permanently remove deep, dynamic wrinkles or biologically reverse the skin aging process. No reputable product should promise that. The effect is real, but conditional: It lasts as long as HA is applied regularly.
Another tip for informed users: Dietary supplements with hyaluronic acid have a significantly weaker evidence base than topical application. Creams and serums with HA, on the other hand, are well tolerated, low-risk, and proven in their moisturizing effect.
Double Hyaluronic Acid at Bergamond & Birch: The Regenesis No. 36 – Night Repair Cream combines high molecular and low molecular HA with marine ferments for nightly regeneration.
Ceramides: Closing the Gaps in the Skin Barrier
Why the skin barrier is the decisive factor
The epidermis functions according to the "brick and mortar" principle: Keratinocytes (cells) are the bricks, lipids – primarily ceramides – are the mortar. This lipid mortar seals the barrier and prevents water from leaving the skin (TEWL) and irritants from entering.eucerin+
Ceramides make up about 50% of the lipids in the stratum corneum. When the barrier is disrupted – recognizable by tightness, redness, dryness, and increased sensitivity – ceramide concentration decreases measurably.
How do topical ceramides work?
Ceramides in skincare products replace or supplement these natural lipids:
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Moisture retention: Ceramides bind water in the stratum corneum and prevent TEWL.
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Barrier repair: They fill gaps in the lipid mortar of the epidermis and strengthen the mechanical protective function.
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Anti-inflammatory: For sensitive skin, ceramides reduce irritation, as the intact barrier buffers stimuli.
An important synergistic effect: Ceramides are significantly more effective in combination with glycerin, hyaluronic acid, and urea – a principle that modern formulations such as the Bergamond & Birch anti-aging line specifically utilize.
Niacinamide also promotes endogenous ceramide synthesis (via upregulation of serine palmitoyltransferase) – a synergistic effect that scientifically justifies the simultaneous use of both active ingredients.
Vitamin C + Ferulic Acid: The Strongest Antioxidant Duo
Vitamin C (L-Ascorbic Acid): Collagen and Glow
Vitamin C is one of the few active ingredients in cosmetology with broad clinical evidence for several simultaneous mechanisms of action:
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Antioxidant function: Vitamin C neutralizes free radicals caused by UV radiation, pollution, and oxidative stress. These free radicals are significantly responsible for premature skin aging.
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Collagen synthesis: Vitamin C is an essential cofactor for prolyl and lysyl hydroxylase – enzymes crucial for stabilizing collagen structure. Without sufficient Vitamin C, stable collagen cannot be formed.
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Melanin regulation: By inhibiting tyrosinase, Vitamin C reduces melanin production and brightens hyperpigmentation such as age spots.
Clinical studies documented significant improvements in wrinkle structure and increased collagen production in the dermis after daily application of 3–5% ascorbic acid over several months.
Ferulic Acid: The Enhancer
Ferulic acid is a plant-based phenolic acid (found in rice, oats, wheat) with strong antioxidant effects – but its most important function in skincare is different: It stabilizes Vitamin C and synergistically boosts its antioxidant capacity.lavera+1
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A formulation of Vitamin C + Vitamin E + Ferulic Acid increases photoprotection against UV-induced skin aging many times over compared to individual active ingredients.
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Ferulic acid protects Vitamin C from oxidative degradation (Vitamin C is known to be unstable, especially when exposed to light and oxygen).
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It also has anti-inflammatory effects and can support collagen production itself.
This synergy is why Bergamond & Birch's CLARITÉ No. 19 – Vitamin C Glow Serum combines both active ingredients in one formulation.
Niacinamide (Vitamin B3): One of the most versatile active ingredients
Spectrum of action and evidence base
According to current research, niacinamide is one of the best-documented cosmetic active ingredients at concentrations of 2–5%. The data includes clinical studies, data from the German Apotheker-Zeitung, and review articles from several research groups.
Proven effects:
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Anti-aging: Significant improvement in fine lines, wrinkles, hyperpigmentation, and redness with consistent use.
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Barrier strengthening: Niacinamide stimulates ceramide synthesis and reduces transepidermal water loss.
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Sebum regulation: Topical niacinamide (2%) measurably reduces sebum excretion rate – relevant for men whose skin tends to be oilier due to androgenic influences.
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Anti-inflammatory action: Niacinamide reduces the release of pro-inflammatory mediators, making it particularly valuable after shaving – a moment when the skin barrier is mechanically stressed.
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Pigment regulation: Inhibition of melanosome transfer from melanocytes to keratinocytes reduces hyperpigmentation in a dose-dependent and reversible manner.
Marine Plankton Extract: Biotechnological protection from the ocean
Biochemistry and active profile
Marine plankton extract is derived from phyto- and zooplankton and obtained through biotechnological fermentation or cold extraction. The special feature of these marine organisms: they have developed extreme survival strategies during their evolution – against UV radiation, osmotic stress, and extreme temperatures. These mechanisms can be used for skincare.
Relevant ingredients and their effects:
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Marine Carotenoids (Fucoxanthin): Strong antioxidants that neutralize free radicals and counteract premature skin aging.
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Extremolytes and marine glycoproteins: Bind water molecules and form a protective structure around skin cells.
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Bioactive peptide complexes: Accelerate the differentiation of skin cells (cell renewal).
Bergamond & Birch Application: The Regenesis No. 36 – Night Repair Cream uses marine plankton extract in combination with dual hyaluronic acid for nocturnal regeneration and barrier renewal.
Why COSMOS NATURAL / ECOCERT certification is not marketing
What the seal really means
COSMOS NATURAL is a European standard for natural and organic cosmetics, developed by ECOCERT together with other leading certification organizations. The requirements are binding and include:
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At least 95% of physically processed ingredients must be of natural origin.
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Prohibition of a defined list of synthetic substances: parabens, PEGs, silicones, mineral oils, synthetic fragrances, microplastics.
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Requirements for manufacturing processes, packaging, and traceability of the raw material chain.
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Annual independent audits by accredited certification bodies.
The difference from a mere claim like "natural" or "clean" on the label: Without this certification, a manufacturer can use almost any of these statements unchecked. With COSMOS certification, there is a verifiable, external verification of the formulation.
All Bergamond & Birch products are COSMOS NATURAL / ECOCERT certified, dermatologically tested and manufactured in the EU according to EU-GMP standard (ISO 22716).
Combining Active Ingredients: What Works, What Doesn't
Proven Active Ingredient Combinations
Combinations with Caution
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Vitamin C + AHA acids: Both are pH-sensitive; when used simultaneously, the effectiveness of both active ingredients can be compromised. Better: Vitamin C in the morning, AHA in the evening.
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Peptides + highly concentrated acid peels: Acids can damage peptide structure; separate application times.
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Niacinamide in very high concentrations (> 5%) for sensitive skin: Can cause flush reactions (reversible redness); prefer low-dose formulations.
The Cleanse. Treat. Hydrate. Routine – explained by active ingredients
The structured three-step system from Bergamond & Birch follows a scientific logic:
Step 1 – Cleanse: A mild surfactant blend (Foaming Facial Wash) removes sebum, environmental particles, and dead keratinocytes without destabilizing the skin barrier with overly aggressive sulfates. Intact barrier = better active ingredient absorption in the next step.
Step 2 – Treat (Serum): Serums deliver the highest active ingredient concentrations in a light, penetrative texture. Peptides, Vitamin C, or Ferulic Acid are used here – applied in a leave-on formulation to cleansed, slightly damp skin for maximum absorption.
Step 3 – Hydrate (Cream): The final cream seals the barrier with ceramides, hyaluronic acid, and botanical lipids, fixing the active ingredients and protecting against transepidermal water loss. Anti-Age Daycream No. 23 uses marine ferment filtrate, hyaluronic acid, and elderflower extract as barrier support.
FAQ – Frequently Asked Questions About Skincare Active Ingredients
What are the most effective anti-aging active ingredients in skincare?
The most scientifically proven anti-aging active ingredients include retinol (Vitamin A), peptides, Vitamin C in combination with ferulic acid, and niacinamide. For beginners and sensitive skin, peptides and niacinamide are the most tolerable options with measurable effects.
How long does it take for peptides to work?
With consistent twice-daily use, signal peptides show measurable effects on wrinkle depth and skin elasticity in clinical studies after 8–12 weeks. Clearly visible results thus require at least one month of regular use.
Why should hyaluronic acid have different molecular weights?
High molecular weight HA forms a protective film on the surface; low molecular weight HA penetrates deeper into the stratum corneum. Dual-HA formulations thus address multiple levels of action simultaneously for more complete hydration.
Is niacinamide particularly relevant for men's skin?
Yes. Men's skin produces more sebum due to androgenic influences and is subjected to greater mechanical stress from daily shaving. Niacinamide regulates sebum production, has an anti-inflammatory effect after shaving, and strengthens the ceramide barrier – a broad spectrum of action that specifically addresses typical problems of men's skin.
What does COSMOS NATURAL mean in practice?
It means that an independent body has annually verified that at least 95% of the physically processed ingredients are of natural origin, that a list of prohibited substances (including parabens, silicones, microplastics, PEGs) is adhered to, and that manufacturing is carried out according to defined process standards. It is the most reliable external verification for clean beauty products in Europe.
Can I use Vitamin C and peptides together?
Yes, this combination is effective and well-tolerated. Peptides stimulate collagen synthesis from within; Vitamin C protects against oxidative degradation and supports collagen stability. Recommendation: Vitamin C in the morning (antioxidant protection during the day), peptides in the morning and/or evening.
