🌅 Restores Sun-Damaged Skin
The synergistic blend of Sea-Buckthorn Oil and antioxidants works to repair and renew skin affected by environmental stressors, revealing a healthier, more luminous complexion.
Stable Vitamin C Serum with Ferulic Acid
Professional-Grade Brightening Without the Irritation | 99% Natural
30 ml / 1.01 fl oz
- Regular price
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€35,92 EUR - Regular price
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€44,90 EUR - Sale price
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€35,92 EUR
Tax included.
Shipping calculated at checkout.
✓ Fades dark spots & hyperpigmentation without redness, peeling, or sensitivity
✓ Stays potent from first drop to last—won't turn brown and lose effectiveness like traditional vitamin C
✓ Triple antioxidant protection (Vitamin C + E + Ferulic Acid) defends against premature wrinkles and environmental aging
✓ Deep hydration from 5 organic plant oils—brightens while nourishing, never greasy
Skin type: Dry skin, Normal skin, Combination skin, and Oily skin
Certified
Made in EU
Cruelty Free
Vegan
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Full Ingredient List
About this serum
Traditional vitamin C oxidizes and dies in the bottle. Stable vitamin C works from first use to last drop.
L-Ascorbic Acid (traditional vitamin C) is notoriously unstable—it oxidizes when exposed to light and air, turning brown and losing all effectiveness while you're still using it. Ascorbyl Glucoside (stable vitamin C) maintains full potency throughout the bottle's life, delivering consistent brightening and antioxidant protection that doesn't degrade the moment you open it.
Why Stable Vitamin C Actually Delivers Results
✓ Fades without inflammation—visibly lightens dark spots, post-acne marks, and sun damage through gentle melanin regulation without the redness, peeling, or sensitivity traditional L-Ascorbic Acid causes in reactive skin
✓ Works until you finish it—Ascorbyl Glucoside remains stable against light, air, and temperature fluctuations, maintaining full brightening potency from first application to last drop instead of oxidizing into useless brown liquid halfway through
✓ Triple defense system—Vitamin C + Vitamin E + Ferulic Acid work synergistically to neutralize free radicals before they create wrinkles, age spots, and collagen breakdown from UV and pollution exposure
✓ Brightens and nourishes simultaneously—5 organic plant oils (Jojoba, Almond, Avocado, Rosehip, Sea Buckthorn) deliver essential fatty acids and additional fat-soluble vitamins while vitamin C works, never leaving greasy residue
✓ Hyaluronic Acid hydration—maintains optimal moisture for vitamin C penetration and effectiveness while preventing the dryness some vitamin C formulas cause
The Vitamin C That Doesn't Waste Your Money
Oxidized vitamin C is just expensive water. Stable vitamin C delivers the brightening and protection you're paying for, consistently, throughout the product's life.
Morning essential for maximum protection: Apply 3-4 drops to cleansed skin before moisturizer. Layer sunscreen on top—vitamin C + SPF provide synergistic photoaging defense. Can also use evenings for accelerated brightening.
The result? Dark spots and hyperpigmentation that progressively fade over 4-6 weeks as melanin production normalizes. Skin tone that becomes visibly more even and radiant. Environmental damage prevention that stops new spots and wrinkles from forming. Just reliable vitamin C that actually works—because stability means consistent potency, not degraded disappointment.
WHAT MAKES TERRA QUIRK DIFFERENT
Terra Quirk
Other Premium brands
Vitamin C Type
Ascorbyl Glucoside
✅ (stable)
L-Ascorbic Acid
❌ (unstable)
Stability
✅ Won't oxidize
✅ Stays potent
❌ Turns brown/orange
❌ Loses effectiveness
pH Balance
✅ 5.5-6.5
(skin-neutral)
❌ 2-3
(highly acidic)
Sensitive Skin
✅ Gentle formula
✅ No redness/peeling
⚠️ May irritate
⚠️ Requires tolerance
Natural Content
✅ 99% plant-based
✅ ECOCERT certified
❌ Mostly synthetic
❌ No certification
Antioxidant Boost
✅ Ferulic Acid + Vitamin E
⚠️ Varies by brand
Hydration
✅ 5 organic plan oils included
⚠️ Often drying
Price (30ml)
€44.90
✅ Direct-to-you pricing
€60-90
⚠️ Retail markup
✨ Professional-grade results. Natural integrity. Honest pricing.
Key Benefits
🌿 Gentle Yet Powerful
Suitable for sensitive skin that can't tolerate traditional L-ascorbic acid. Our pH-balanced formula delivers results without redness, peeling, or irritation.
💧 Hydrates & Nourishes
Unlike water-based vitamin C serums that can feel drying, our oil-serum hybrid delivers deep hydration through organic plant oils while Sodium PCA and Hyaluronic Acid lock in moisture.
✨ Boosts Collagen Production
Stable Vitamin C supports natural collagen synthesis, helping to improve skin firmness and elasticity while minimizing the appearance of fine lines over time.
🛡️ Defends Against Photoaging
The Ferulic Acid + Vitamin E combination creates a powerful antioxidant shield against UV damage and free radicals—the primary causes of premature aging, wrinkles, and fine lines.
🌟 Brightens & Evens Skin Tone
Ascorbyl Glucoside inhibits melanin production, gradually fading dark spots, sun damage, and hyperpigmentation for a more radiant, even complexion.
REAL RESULTS, REAL SKIN
Brighter, more even skin tone after 6 weeks of daily use
✨ VISIBLE IMPROVEMENTS:
✓ Reduced dark spots and hyperpigmentation
✓ More even, radiant skin tone
✓ Brighter, healthier-looking complexion
✓ No redness, peeling, or irritation
Results from consistent daily use (AM & PM) over 6 weeks.
Individual results may vary.
WHY STABLE VITAMIN C MATTERS
Terra Quirk's Ascorbyl Glucoside
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No oxidation = no wasted product
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Suitable for sensitive skin
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Consistent results from first to last drop
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Gentle, skin-neutral pH
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Remains stable throughout bottle's life
Traditional L-ascorbic acid serums
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Turn brown/orange = degraded product
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Can irritate sensitive skin (low pH)
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Lose effectiveness over time
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Oxidize when exposed to light and air
Pro Tips:
Apply before heavier creams for optimal absorption
For autumn/winter: Mix with our Hydrating Serum for extra nourishment
Layer under our Niacinamide Gel for enhanced brightening effects
Can also be used at night—vitamin C works around the clock
Use in the morning for maximum photoprotection (pair with our SPF 30 Sunscreen)
Key Ingredients
Vitamin C
Watch dark spots fade and your natural radiance emerge as this powerhouse brightener reveals the even, glowing complexion you've been waiting for.
Sidium PCA
Experience the instant relief of deep, lasting hydration as your skin drinks in moisture from the air, transforming dryness into soft, supple comfort that lasts all day.
Ferulic Acid
Shield your skin from the daily environmental assault that ages you prematurely, keeping your complexion youthful and resilient against the visible signs of photoaging.
Hyaluronic Acid
Feel your skin plump and smooth as fine lines visibly soften, revealing the fuller, more youthful appearance you thought you'd lost.
Avocado Oil
Sink into luxurious softness as this deeply nourishing oil melts into your skin, delivering intense moisture and essential nutrients that leave you feeling pampered and protected.
Sea-Buckthorn Oil
Nourish your way to noticeably healthier, more radiant skin as this botanical powerhouse accelerates renewal and floods your complexion with revitalizing essential fatty acids.
Vitamin E
Defend your skin's future while enhancing its present—protecting against daily damage while strengthening your skin's natural barrier for long-term resilience and visible vitality.
Jojoba Seed Oil
Balance meets nourishment—this lightweight wonder mimics your skin's natural oils to hydrate without heaviness, leaving every skin type feeling perfectly comfortable and naturally radiant.
Almond Oil
Soothe away roughness and irritation as this gentle, vitamin-rich oil softens even the most sensitive skin, revealing a smoother, calmer complexion you'll love to touch.
Rosehip Seed Oil
Turn back time naturally as this regenerating botanical treasure works to fade imperfections, smooth uneven texture, and restore the youthful luminosity your skin craves.
The Boldly Natural Routine: Your Path to Unapologetic Radiance
Discover our step-by-step guide to transforming your skin with powerful botanicals and clean science.
Earth-Conscious Beauty: Our Planet-First Promise
Every product reflects our commitment to sustainable practices, from eco-certified ingredients to recyclable packaging.
Explore our ECOCERT COSMOS Natural certification and comprehensive approach to environmental responsibility.
REAL PEOPLE, REAL RESULTS
The Bold Truth: FAQ Hub
Traditional vitamin C serums use L-ascorbic acid, which oxidizes quickly (turning brown) and can irritate sensitive skin due to its highly acidic pH (2-3). Terra Quirk uses stable Ascorbyl Glucoside—a plant-derived form of vitamin C that: ✓ Won't oxidize or turn brown (stays potent from first to last drop) ✓ Has a gentle, skin-neutral pH (5.5-6.5) suitable for sensitive skin ✓ Delivers the same brightening results without redness or peeling ✓ Works consistently throughout the bottle's life Plus, we enhance it with Ferulic Acid + Vitamin E for triple antioxidant protection and 5 organic plant oils for hydration— something most vitamin C serums lack.
Absolutely! This serum was specifically formulated for sensitive skin. Unlike traditional vitamin C serums that use harsh L-ascorbic acid (pH 2-3), our stable Ascorbyl Glucoside has a gentle, skin-neutral pH of 5.5-6.5—the same as healthy skin. This means: ✓ No redness, stinging, or irritation ✓ No peeling or sensitivity ✓ Safe for reactive, rosacea-prone, and sensitive skin types ✓ Can be used daily, morning and evening Our formula is also 99% plant-based, ECOCERT certified, fragrance-free, and dermatologically tested. If you've had bad experiences with vitamin C before, this is your gentle alternative.
Yes! Our stable vitamin C plays well with most actives. SAFE TO COMBINE: ✓ Niacinamide (enhances brightening—try our Niacinamide Gel!) ✓ Hyaluronic Acid (boosts hydration) ✓ Peptides (anti-aging synergy) ✓ SPF (essential pairing—they work together) ✓ AHA/BHA Exfoliants (use on alternate days or different times) WITH RETINOL ALTERNATIVE - BAKUCHIOL: ✓ Use Vitamin C in the morning, retinol at night ✓ Or alternate days if skin is sensitive ✓ Both are safe together, just start slowly When in doubt: Vitamin C goes on clean skin, before heavier products.
Never. Terra Quirk is 100% cruelty-free. ✓ No animal testing at any stage of production ✓ Our suppliers don't test on animals ✓ We don't sell in markets that require animal testing ✓ All products are vegan (no animal-derived ingredients) ✓ ECOCERT certified natural and organic We believe in beauty without compromise—effective skincare that respects all living beings and the planet.
Our formulations contain 99% plant-based ingredients sourced from organic farming with official certifications. We combine botanical extracts, plant oils, and natural active ingredients like hyaluronic acid and bakuchiol to create effective skincare without compromising on environmental responsibility. The remaining <1% consists of safe preservatives (like potassium sorbate) that ensure product stability and safety—allowed under ECOCERT COSMOS standards because they're currently the most effective way to prevent harmful bacteria growth. Your safety + product effectiveness = our priority.
You'll notice a difference faster than you might expect: Week 1-2: Skin feels more hydrated and looks brighter/more radiant Week 3-4: Visible improvement in skin tone evenness Week 4-6: Noticeable reduction in dark spots and hyperpigmentation Week 8+: Significant brightening and photoaging protection benefits For best results: - Use daily (morning and/or evening) - Always pair with SPF 30 in the morning - Be consistent—vitamin C is cumulative in its benefits - Layer under moisturizer for optimal absorption Remember: Natural, stable formulas work progressively for lasting results, not overnight miracles. Your skin is worth the patience.
Yes! Vitamin C is excellent for acne-prone skin because it: ✓ Fades post-acne marks and hyperpigmentation ✓ Has gentle anti-inflammatory properties ✓ Won't clog pores (non-comedogenic) ✓ Helps prevent future breakouts through antioxidant protection Our formula includes 5 organic plant oils, but they're lightweight and actually help balance oil production rather than adding greasiness. For oily skin, we recommend: - Layering with our Oil-Free Hydrating Gel or Niacinamide Gel - Using in the morning under SPF 30 - Pairing with our AHA Peeling Concentrate 2x/week for texture The stable Ascorbyl Glucoside won't irritate or dry out acne-prone skin like harsh treatments can.
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