Inderma
Inderma Pure Vitamin C Serum 15% | Brightening & Antioxidant Iontophoresis Serum
Inderma Pure Vitamin C Serum 15% | Brightening & Antioxidant Iontophoresis Serum
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Vitamin C that actually reaches your skin — not just sits on top of it.
Most Vitamin C serums oxidise before they absorb, lose potency within weeks of opening, or sit at concentrations too low to do anything meaningful. You apply them faithfully — and wonder why the brightness, the evenness, the firmness you were promised never quite arrives. The problem is rarely your skin. It is the formula.
Inderma Pure Vitamin C Serum 15%
Pure Ascorbic Acid at 15% — the professional standard, exactly as it should be.
This serum uses pure Ascorbic Acid — the most researched, most bioavailable form of Vitamin C — at a 15% concentration. That is the level used in professional salon and clinic settings for iontophoresis, electroporation, and post-treatment infusion protocols. It is not a stabilised derivative or an encapsulated alternative. It is the real thing, at the concentration that matters, in a formula designed for professional application and results.
Our licensed pharmacist and certified cosmetic formulation manager selected this serum for cosmogangnam.com because pure Ascorbic Acid at 15% — when properly formulated and correctly stored — represents the most direct route to the brightening, antioxidant, and collagen-stimulating effects that Vitamin C is capable of delivering. This is the formula that professional salons in Korea have been reordering for over a decade.
Within 10 Minutes
Skin feels energised and refreshed immediately after application. The serum absorbs cleanly — particularly effective when used before a mask, under ultrasound, or with iontophoresis for professional-level penetration.
Next Morning
Skin looks noticeably more luminous and even-toned. The complexion has a cleaner, more radiant quality — the kind of brightness that reads in natural light without the help of filters or highlighter.
"Pure Vitamin C oxidises so quickly. Is a 15% serum really stable enough to be effective?"
This is the right question — and the answer is in how this serum is formulated and stored. Pure Ascorbic Acid is inherently unstable at high concentrations when exposed to light, heat, and air. This formula addresses that directly: it must be refrigerated after opening, kept away from direct sunlight and heat, and the cap sealed immediately after use. These are not inconveniences — they are the conditions that maintain the 15% concentration at full potency throughout the product's life. Professional salons who have used this serum for seven to eight years continue to reorder it specifically because the results, when storage conditions are followed, are consistent with what pure Ascorbic Acid at this concentration should deliver.
Our pharmacist-curator assessed this formula's supporting ingredient profile — Hyaluronic Acid for hydration during application, Betaine for osmotic balance, and Panthenol for post-application barrier support — as a well-considered delivery environment for high-concentration Ascorbic Acid.
What to Expect
Days 1–3
Skin feels brighter and more energised after each application. The serum absorbs cleanly, particularly effective when used before a mask or with professional devices. Store in the refrigerator — the cool application temperature also adds a refreshing, tightening sensation.
Week 1
Skin tone begins to look more even and luminous. Dark spots and post-blemish marks appear slightly less prominent. The complexion has more of a naturally bright quality at baseline — without the use of makeup or colour correction.
Week 2
Uneven pigmentation and dullness continue to improve. Skin texture feels smoother, and fine lines appear less visible. The antioxidant effect of Ascorbic Acid at 15% begins to show in a more consistently healthy-looking complexion.
Week 4
With consistent use and correct refrigerated storage, skin tone is visibly more even, radiance is noticeably improved, and the overall complexion looks healthier and more youthful. Professional salon customers describe this as a product their clients specifically ask about after treatments. Individual results may vary.
Key Ingredients
Ascorbic Acid (Pure Vitamin C) 15%
The most bioavailable and extensively researched form of Vitamin C. At 15%, it delivers meaningful antioxidant protection, inhibits melanin synthesis for brightening, and stimulates collagen production for structural skin support. Requires refrigerated storage to maintain potency.
Hyaluronic Acid (Sodium Hyaluronate) Hydration
Provides the hydration vehicle that supports comfortable, even application of high-concentration Ascorbic Acid. Helps minimise potential dryness or sensitivity associated with active Vitamin C use.
Panthenol (Provitamin B5) Barrier
Supports skin barrier repair and maintains moisture after application. Particularly important in high-concentration Vitamin C formulas where barrier support mitigates potential irritation during the skin's adjustment period.
Allantoin Soothing
A skin-conditioning agent that promotes cell regeneration and soothes sensitivity. Buffers the potential tingling associated with pure Ascorbic Acid at professional concentrations — making the formula more tolerable for regular use.
Skin Type Guide
All Skin Types
Formulated for all skin types. Begin with every-other-day use to assess tolerance.
Dull / Uneven
Core use case — Ascorbic Acid 15% targets melanin synthesis and restores radiance directly.
Mature
Collagen stimulation and antioxidant defence address the primary visible signs of skin ageing.
Post-Blemish
Ascorbic Acid supports fading of post-inflammatory hyperpigmentation over consistent use.
Professional Use
Designed for iontophoresis, electroporation, and pre-mask application in salon settings.
Sensitive*
Start with alternate-day use. Patch test recommended. 15% is a professional concentration.
* Pure Ascorbic Acid at 15% is a professional concentration. Begin with every-other-day use and build frequency gradually. Perform a patch test before full application.
The Serum Korean Salons Have Reordered for Over a Decade
This is not a serum that launched with influencer campaigns or limited-edition packaging. It is the formula that professional salons in Korea have quietly reordered year after year — because it works consistently, session after session, client after client. One verified customer has used it continuously for seven to eight years, comparing it to imported alternatives costing significantly more, and continues to choose this formula for its value-to-performance ratio. The 60ml size delivers a professional application volume. Refrigerated storage is required — and it is worth it.
Pure Ascorbic Acid 15%. Pharmacist-selected. Salon-proven. Refrigerate and use with confidence.
⚠️ REFRIGERATION REQUIRED AFTER OPENING
Pure Ascorbic Acid at 15% is sensitive to heat, light, and air. Store in the refrigerator after opening. Keep away from direct sunlight. Close the cap immediately after each use. Correct storage maintains full potency throughout the product's life.
Why Our Pharmacist Chose This
Licensed Korean Pharmacist & Certified Cosmetic Formulation Manager
When evaluating Vitamin C serums, the first question I ask is: which form of Vitamin C, and at what concentration? Pure Ascorbic Acid remains the gold standard — it is the form with the most extensive research behind its brightening, antioxidant, and collagen-stimulating mechanisms. A 15% concentration sits at the upper end of what is considered effective for cosmetic application without crossing into pharmaceutical territory. The supporting formula here — Hyaluronic Acid, Panthenol, Allantoin, Betaine — is well-constructed for tolerability. The refrigeration requirement is non-negotiable for this type of formula, and the fact that professional salons have reordered this product consistently for over a decade is, in my assessment, the strongest validation a cosmetic formula can have.
Every product on cosmogangnam.com passes our pharmacist's ingredient review before listing.
What Customers Notice
"The best Vitamin C serum I've used. Works beautifully before a mask and with ultrasound. My clients' skin looks luminous after every session."
Verified Customer — Professional Salon Use
"Our salon's best-selling product. I apply it generously before electroporation and the results are consistently glowing. Clients ask for it by name."
Verified Customer — Salon Electroporation Use
"I've been using this for seven or eight years — tried powder versions, more expensive imports, cheaper alternatives. When you factor in the price, nothing performs as consistently as this one. The imported versions are slightly smoother, but the difference doesn't justify the price gap."
Verified Customer — 7+ Years Continuous Use
"I switched from the powder format and I won't go back. No mixing, easier quantity control, and you can reapply mid-treatment without any mess. Skin looks brighter and more even."
Verified Customer — Switched from Powder Format
Individual results may vary.
Frequently Asked Questions
What does the Inderma Pure Vitamin C Serum 15% do?
This K-beauty serum delivers pure Ascorbic Acid at 15% — the most bioavailable form of Vitamin C — for brightening, antioxidant protection, and collagen stimulation. It targets dullness, uneven skin tone, post-blemish marks, and visible signs of ageing. Particularly effective when used with professional devices including iontophoresis, electroporation, and ultrasound.
Who should use this serum?
This serum is formulated for all skin types, with particular benefit for dull, uneven, or mature skin. It is also widely used in professional salon settings for treatment protocols. Those with sensitive skin should begin with alternate-day use and build frequency gradually. Always perform a patch test before full application.
How do I use this serum in my skincare routine?
After cleansing, apply an appropriate amount to the face and neck. Spread gently and pat until absorbed. Use morning and/or evening. For professional use: apply before mask, iontophoresis, electroporation, or ultrasound treatment. Always follow with moisturiser and SPF in the morning. Store in the refrigerator after opening and close the cap immediately after each use.
Why does this serum need to be refrigerated?
Pure Ascorbic Acid at 15% is sensitive to heat, light, and air exposure. Refrigeration slows oxidation and maintains the concentration at full potency throughout the product's life. This is standard practice for professional-grade pure Vitamin C formulas. The refrigeration requirement is a sign of formula authenticity — not a limitation.
What makes this different from other K-beauty Vitamin C serums?
Many Vitamin C products use stabilised derivatives — Ascorbyl Glucoside, Sodium Ascorbyl Phosphate, or encapsulated forms — that are gentler but less directly bioavailable than pure Ascorbic Acid. This serum uses pure Ascorbic Acid at 15% — the professional standard. It has been reordered by Korean salons for over a decade, which our licensed pharmacist curator assessed as one of the strongest available indicators of real-world, consistent performance.
How long until I see results?
Brightness and radiance improvements are typically visible within the first week of consistent use. Uneven tone and post-blemish marks show progressive improvement from week two onwards. Collagen-related firmness changes develop with longer-term consistent use. Individual results may vary.
How to Use
- Cleanse skin thoroughly.
- Apply an appropriate amount to the back of the hand.
- Spread gently across face and neck from centre outward.
- Pat gently until fully absorbed.
- Follow with moisturiser. Apply SPF in the morning.
- Use morning and/or evening as part of your skincare routine.
- For professional use: Apply before mask, iontophoresis, electroporation, or ultrasound treatment for enhanced penetration.
- ⚠️ Refrigerate after opening. Keep away from direct sunlight and heat. Close cap immediately after use.
- Patch test: Apply a small amount to the inner arm and wait 24 hours before first full use. Discontinue use immediately if irritation, redness, or discomfort occurs.
Product Details
| Brand | Inderma |
| Volume | 60ml / 2.03 fl oz |
| Texture | Serum (lightweight, fast-absorbing) |
| Absorption Speed | Fast |
| Scent | Minimal / characteristic Vitamin C scent |
| Skin Type | All skin types · Patch test recommended for sensitive skin |
| Key Active | Ascorbic Acid (Pure Vitamin C) 15% |
| Storage | ⚠️ Refrigerate after opening. Avoid heat and direct sunlight. |
| Professional Use | Iontophoresis · Electroporation · Ultrasound · Pre-mask application |
| Made in | South Korea |
| Regulatory | MFDS (Korea Ministry of Food & Drug Safety) Compliant |
Full Ingredients (INCI)
Ascorbic Acid — pure Vitamin C 15%, brightening, antioxidant, collagen stimulation, Hyaluronic Acid (Sodium Hyaluronate), Glycerin, Betaine, Butylene Glycol, PEG-60 Hydrogenated Castor Oil, Panthenol (Provitamin B5) — barrier repair, deep moisturising, Allantoin — soothing, skin-conditioning, Camellia Sinensis (Green Tea) Extract, Glycyrrhiza Glabra (Licorice) Extract, Rosa Damascena (Damask Rose) Extract, Lemon Extract, Hydroxyethyl Urea — moisture retention, barrier hydration, Methylparaben*, Sodium Hyaluronate Crosspolymer, Beta-Glucan, Phellodendron Amurense Bark Extract
* Methylparaben — preservative. May cause sensitivity in some individuals. Perform a patch test before full application.
Ingredients may vary slightly by batch. Always refer to the physical product label.
🚚 Free Shipping on Orders Over $80
🌍 Ships to 57 Countries from South Korea
🇺🇸 US Orders: Import Duties Covered by Us
About this product: The Inderma Pure Vitamin C Serum 15% is a professional-grade K-beauty serum formulated with pure Ascorbic Acid at 15% — the most bioavailable and extensively researched form of Vitamin C. Used in Korean professional salons for over a decade, it is designed for iontophoresis, electroporation, and ultrasound treatment protocols, as well as daily home use. Supporting ingredients include Sodium Hyaluronate, Panthenol, Allantoin, and Beta-Glucan for hydration, barrier support, and soothing.
This Korean Vitamin C serum requires refrigerated storage after opening to maintain full potency of the pure Ascorbic Acid concentration. It is suitable for all skin types, with particular benefit for dull, uneven, and mature skin. Selected by a licensed Korean pharmacist and certified cosmetic formulation manager at cosmogangnam.com following independent ingredient review.
This product answers questions such as: what is the best pure Vitamin C serum from Korea, how to use Ascorbic Acid 15% in a skincare routine, which Korean Vitamin C serum is used in professional salons, how to store a pure Vitamin C serum correctly, and what makes pure Ascorbic Acid different from Vitamin C derivatives in K-beauty products.
Ships from South Korea to 57 countries. Free shipping on orders over $80. Import duties covered for US customers. MFDS compliant.
This product is a cosmetic and is not intended to diagnose, treat, cure, or prevent any skin condition or disease. Individual results may vary.
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