ISNTREE Hyper Vitamin C 23 Serum 20ml

23% Pure Vitamin C for Brighter, Clearer & More Even-Looking Skin

Reveal your natural glow with ISNTREE Hyper Vitamin C 23 Serum, a high-potency Korean brightening serum formulated with 23% pure Vitamin C (Ascorbic Acid) to help improve the appearance of dark spots, uneven skin tone, and dullness.

Powered by concentrated Vitamin C and enriched with Vitamin E, Panthenol, and Birch Sap, this intensive brightening serum combines antioxidant care with refreshing hydration to promote a smoother, more radiant-looking complexion.

Unlike many high-concentration Vitamin C serums that can feel drying, its lightweight, moisture-rich formula helps keep skin feeling hydrated and comfortable while delivering targeted brightening care.

Whether you're concerned about dark spots, post-acne marks, or a tired-looking complexion, this concentrated Vitamin C serum is designed to support a brighter, healthier-looking glow.

Key Benefits

• 23% Pure Vitamin C: A high-concentration Ascorbic Acid formula that helps visibly improve dullness and uneven skin tone.

• Dark Spot & Hyperpigmentation Care: Helps reduce the appearance of dark spots and post-blemish marks for a more even-looking complexion.

• Triple Tone Appearance Care: Targets the appearance of dullness and uneven facial tone for a clearer, more balanced-looking complexion.

• Antioxidant-Rich Formula: Vitamin C and Vitamin E provide antioxidant skincare support against environmental stressors.

• Hydrating & Comforting Care: Panthenol, Birch Sap, and moisturizing ingredients help maintain skin hydration and comfort.

• Lightweight Serum Texture: A hydrating formula that absorbs comfortably without a heavy finish.

• Concentrated Brightening Solution: Designed for those seeking intensive Vitamin C care as part of their skincare routine.
  
  
  

Key Ingredients

23% Pure Vitamin C (Ascorbic Acid)

A potent antioxidant and brightening ingredient that helps improve the appearance of hyperpigmentation, dark spots, and uneven skin tone. Supports a clearer, more radiant-looking complexion.

Ethyl Ascorbyl Ether (Vitamin C Derivative)

A stabilized Vitamin C derivative that complements the pure Vitamin C formula and supports a brighter, more even-looking skin tone.

Vitamin E (Tocopherol)

An antioxidant ingredient that works alongside Vitamin C to help protect the skin from environmental oxidative stress and support a healthy-looking complexion.

Panthenol (Pro-Vitamin B5)

Helps soothe and moisturize the skin while supporting a comfortable, healthy-looking skin barrier.

Birch Sap (Betula Platyphylla Japonica Juice)

A botanical ingredient that helps provide refreshing hydration and maintain a soft, moisturized skin feel.

Texture & Finish

A lightweight, moisture-rich serum that spreads smoothly and absorbs comfortably.

Designed to deliver concentrated Vitamin C care while maintaining a hydrated, refreshed finish.

Recommended For

• Dull and tired-looking skin

• Dark spots and uneven skin tone

• Post-acne marks and visible pigmentation concerns

• Skin lacking clarity and radiance

• Those looking for a high-strength Vitamin C serum

Skin Type Note: Due to its high concentration of pure Vitamin C, this serum is best introduced gradually, especially for first-time Vitamin C users or those with sensitive skin.

Brand-Reported Skin Tone Evaluation

ISNTREE reports that its Hyper Vitamin C 23 Serum was evaluated for improvements in the appearance of red, yellow, and dark facial tones after a single application.

The single-use human application study involved 20 participants and was conducted by Corederm Dermatological Science Institute on May 22, 2023.

Results reflect an immediate, single-use assessment. Individual results may vary.

How to Use

1. After cleansing, apply your regular toner and allow your skin to dry.

2. Dispense 2–3 drops of ISNTREE Hyper Vitamin C 23 Serum onto your palm.

3. Gently spread across the face, avoiding the immediate eye area and irritated skin.

4. Lightly pat until absorbed.

5. Follow with a moisturizer to maintain hydration.

For First-Time Vitamin C Users: Start with 1–2 applications per week or once every 3–4 days. Gradually increase frequency depending on your skin's tolerance.

Recommended Use: Evening application is preferred. If used during the daytime, always follow with a broad-spectrum sunscreen of SPF 30 or higher.

Cautions

• Patch Test Before Use: High-concentration Vitamin C may cause irritation depending on individual skin sensitivity. Perform a patch test before applying to the entire face.

• Adjust Usage Frequency: Start slowly and increase the amount and frequency gradually according to your skin's tolerance.

• Avoid Harsh Exfoliation: Do not combine in the same routine with irritating scrubs, strong peeling treatments, or exfoliating devices. Use extra caution when pairing with AHA or BHA exfoliants.

• Sun Protection Is Essential: If using during the day, apply broad-spectrum sunscreen to help protect your skin from UV exposure.

• Avoid Compromised Skin: Do not apply to broken or significantly irritated skin. Discontinue use if persistent redness, burning, swelling, or irritation occurs.
  
  
  

Frequently Asked Questions (FAQ)

Q1. How often should I use ISNTREE Hyper Vitamin C 23 Serum?

Because this serum contains a high concentration of 23% pure Vitamin C, we recommend starting with 1–2 applications per week, particularly if you are new to Vitamin C skincare.

Gradually increase the frequency based on your skin's tolerance. Daily use is not necessary for beginners.

Q2. Can I use this 23% Vitamin C serum during the day?

Yes, but evening use is recommended, particularly for those new to high-strength Vitamin C.

If you prefer using it in the morning, always follow with a broad-spectrum sunscreen of SPF 30 or higher to help protect your skin from UV damage.

Q3. Can I use this serum with AHA, BHA, or other exfoliating products?

Combining high-concentration Vitamin C with strong exfoliating acids, scrubs, or peeling treatments may increase the risk of irritation.

For sensitive skin, avoid using these products in the same routine. Consider applying exfoliating products on alternate days instead.

Q4. Is it normal to experience redness, tingling, or flaking after using this serum?

High-strength Vitamin C may cause tingling or irritation, particularly when first introduced into a skincare routine.

However, redness, burning, or flaking should not be considered proof that the product is working.

If irritation occurs, stop using the serum and allow your skin to recover. If symptoms are severe or persistent, seek professional advice before using it again.

Q5. How should I store ISNTREE Hyper Vitamin C 23 Serum?

For optimal freshness, store the serum in the refrigerator after opening.

Keep the bottle tightly closed and protected from heat and direct sunlight. The brand recommends finishing the product within 3 months after opening to help maintain its quality.

Q6. Why has my Vitamin C serum become darker or developed a different smell?

Pure Vitamin C is sensitive to air, light, and heat. Over time, the serum may gradually deepen in color or develop a noticeable scent as oxidation occurs.

Minor changes can occur naturally. However, if the serum becomes significantly darker, such as deep orange or brown, discontinue use.

For optimal freshness, use the serum within 3 months of opening and store it properly.

Q7. Why does the bottle make a hissing sound when opened?

According to the brand, gas may develop due to the characteristics of the Vitamin C formula, which can cause a slight hissing sound when opening the container.

The packaging is designed with protective sealing to help minimize potential leakage.

Avoid shaking the unopened bottle. After attaching the dropper securely, gently move the bottle from side to side before use if needed.

If you notice unusual pressure, significant leakage, or damaged packaging, please contact customer support before use.

Q8. Why does the bottle look partially empty? Is it underfilled?

No. The bottle is intentionally designed with additional space to accommodate the characteristics of the formula and allow for safe handling.

Each bottle contains the stated net volume of 20ml, even if the container does not appear completely full.

Full Ingredients

Water, Ascorbic Acid (23%), Propanediol, Betaine, 1,2-Hexanediol, Polyglycerin-3, Tromethamine, Ethyl Ascorbyl Ether, Hydroxyethyl Urea, Betula Platyphylla Japonica Juice, Ethylhexylglycerin, Adenosine, Disodium EDTA, Panthenol, Gardenia Florida Fruit Extract, Dextrin, Tocopherol.

Intensive Vitamin C Care for Brighter, More Radiant-Looking Skin.

Made in South Korea | Net Volume: 20ml