Pure Vitamin C24 Serum
Pure Vitamin C24 Serum
Product Description
Product overview
A high-potency brightening serum with 24% pure L-Ascorbic Acid (246,750ppm), Triple Collagen, and CICA-7 Complex. Targets hyperpigmentation, fine lines, and uneven skin tone while soothing sensitive skin for a radiant, youthful complexion.
24% High-Potency Brightening
Pure L-Ascorbic Acid at 246,750ppm concentration targets dark spots, melasma, and uneven skin tone for visible radiance in 2 weeks.
Texture & feel
SENSORY24% High-Potency Brightening
Pure L-Ascorbic Acid at 246,750ppm concentration targets dark spots, melasma, and uneven skin tone for visible radiance in 2 weeks.
Triple Collagen Complex
Hydrolyzed, Soluble, and Atelocollagen work together to boost skin elasticity, plump fine lines, and restore firmness.
CICA-7 Soothing Complex
Seven Centella Asiatica extracts calm irritation, reduce redness, and protect sensitive skin from environmental stressors.
Argireline Peptide (Botox-Alternative)
Acetyl Hexapeptide-8 relaxes expression lines and provides anti-wrinkle benefits without injections.
Safety & compatibility
SAFEVitamin C (L-Ascorbic Acid) is safe for topical use during pregnancy. Contains no retinoids, salicylic acid, or other pregnancy-unsafe ingredients.
Free from ferments, fatty acids, esters, and polysorbates that feed malassezia yeast. Verified safe by SkinSort.
Oil-free, silicone-free formula with no pore-clogging ingredients. Safe for acne-prone skin.
24% concentration is potent. Start slowly (every 3-4 days) and patch test first. May cause slight tingling initially.
Always apply SPF 30+ when using during the day. Vitamin C increases photosensitivity.
Clinically tested for non-irritation. Suitable for sensitive skin when used as directed.
Ingredient breakdown
INGREDIENTSAscorbic Acid (Vitamin C) 24%Gold Standard
Pure L-Ascorbic Acid is the most researched and potent form of Vitamin C. At 24%, this is a high-strength concentration that delivers maximum brightening, antioxidant, and collagen-boosting benefits.
- Brightening: Inhibits tyrosinase enzyme to reduce melanin production and fade dark spots
- Collagen Synthesis: Essential co-factor for collagen production, improving skin firmness
- Antioxidant: Neutralizes free radicals from UV and pollution damage
- Studies: Efficacy maxes out at 20% concentration; higher percentages may increase irritation without added benefit
Alpha-Bisabolol 0.5%Proven
A chamomile-derived compound with powerful anti-inflammatory and skin-soothing properties. Helps counterbalance potential irritation from high-strength Vitamin C.
- Anti-inflammatory: Reduces redness and calms irritated skin
- Brightening: Works synergistically with Vitamin C to even skin tone
- Wound healing: Promotes skin repair and regeneration
Triple Collagen Complex -Firming
A combination of Hydrolyzed Collagen, Soluble Collagen, and Atelocollagen provides multiple molecular weights for better penetration and hydration at different skin layers.
- Hydrolyzed Collagen: Small peptides penetrate deeply to signal collagen production
- Soluble Collagen: Forms a film on skin for moisture retention
- Atelocollagen: Low-immunogenic collagen for sensitive skin compatibility
CICA-7 Complex (Centella Asiatica) -Soothing
Seven different Centella Asiatica extracts including root, leaf, and whole plant extracts, plus isolated actives: Asiatic Acid, Asiaticoside, Madecassic Acid, and Madecassoside.
- Madecassoside: Inhibits UV-induced melanin synthesis and promotes collagen expression
- Asiaticoside: Stimulates collagen I synthesis and wound healing
- Combined effect: Anti-inflammatory, barrier repair, and anti-aging benefits
Acetyl Hexapeptide-8 (Argireline) -Anti-Wrinkle
Known as "Botox in a bottle," this peptide temporarily relaxes facial muscles to reduce the appearance of expression lines.
- Mechanism: Inhibits neurotransmitter release to relax facial muscles
- Studies: 10% solution reduced wrinkle depth by 17% in 15 days (in-vivo)
- Note: Less dramatic than Botox but provides cumulative benefits with regular use
18 ingredients
Propanediol, Ascorbic Acid, Betaine, (-)-Alpha-Bisabolol, Water, Butylene Glycol, 1,2-Hexanediol, Centella Asiatica Root Extract, Centella Asiatica Extract, Centella Asiatica Leaf Extract, Soluble Collagen, Hydrolyzed Collagen, Atelocollagen, Asiatic Acid, Madecassoside, Madecassic Acid, Asiaticoside, Acetyl Hexapeptide-8
Where it fits in your routine
ROUTINEApply to clean, dry skin before heavier serums and moisturizers. Best used in the evening; if using in AM, always follow with SPF 30+.
How to use
HOW TO USECleanse & Prep
Start with clean, dry skin. Apply after toner/essence if using, or directly on bare skin after cleansing.
Dispense 2-3 Drops
Take 2-3 drops onto fingertips or palm. A little goes a long way with this concentrated formula.
Pat Gently
Gently pat and press into skin (don't rub). Focus on areas with dark spots or uneven tone. Avoid eye area.
Wait & Layer
Wait 30-60 seconds for absorption, then follow with moisturizer. Apply SPF 30+ if using during the day.
Build Tolerance
Start with every 3-4 days, gradually increasing to daily use as skin adapts to the high concentration.
Who is it for?
WHOPerfect for you if:
- You have dark spots, hyperpigmentation, or melasma
- You want to brighten dull, tired-looking skin
- You're addressing early signs of aging (fine lines, loss of firmness)
- You want antioxidant protection from environmental damage
- You've used Vitamin C before and want a higher concentration
- You prefer fragrance-free, minimal ingredient formulas
- You have fungal acne and need a safe brightening serum
Consider alternatives if:
- You're new to Vitamin C (start with 10-15% first)
- You have very sensitive or reactive skin
- You prefer a stabilized Vitamin C derivative for longer shelf life
- You dislike oily-textured serums
- You want a serum with Vitamin E and Ferulic Acid for enhanced stability
- You're looking for a budget option under $15
Skin type compatibility
SKIN TYPESThe oily-serum texture may feel slightly heavy. Use only 2 drops and follow with a lightweight moisturizer.
The propanediol base provides hydration. Triple Collagen adds moisture retention. Layer with a rich cream.
Works well on combination skin. Use less on T-zone if concerned about oiliness.
The CICA-7 Complex soothes, but 24% is potent. Patch test and start slowly. Consider a lower concentration if irritation persists.
Non-comedogenic, fungal acne safe, oil-free. Helps fade post-acne marks and hyperpigmentation.
Results timeline
WEEK 8-12Initial Glow & Hydration
Skin appears more hydrated and has a subtle immediate glow from the serum's antioxidant protection. Some may experience mild tingling as skin adjusts.
85% noticed improved hydrationBrighter, More Even Tone
Visible improvement in skin radiance and overall brightness. Dark spots begin to fade. Texture feels smoother and more refined.
78% reported brighter complexionReduced Hyperpigmentation
Noticeable fading of dark spots, sun damage, and post-acne marks. Skin tone appears more uniform. Fine lines look less prominent.
72% saw faded dark spotsFirmer, Youthful Skin
Collagen-boosting effects become visible. Skin feels firmer, more elastic. Continued improvement in overall skin health and resilience.
65% noticed improved firmnessRatings by platform
950+ REVIEWSPros & cons
BALANCEDPraised
- High 24% concentration delivers visible results quickly
- Noticeable brightening and dark spot fading within weeks
- CICA-7 Complex makes it gentler than expected for sensitive skin
- Clean formula: fragrance-free, paraben-free, silicone-free
- Fungal acne and pregnancy safe
- Eco-friendly glass packaging with recyclable label
- Doesn't oxidize as quickly as some competitors
- Triple collagen adds firming and hydrating benefits
Criticized
- Oily, thick texture not suitable for everyone
- Small 30ml bottle depletes quickly at $20+ price point
- Must use within 2 months of opening
- No Vitamin E or Ferulic Acid for enhanced stability
- 24% may be too strong for Vitamin C beginners
- Dropper packaging exposes product to air and light
- Slight Vitamin C scent (metallic/hot dog)
Budget-friendly alternatives (dupes)
DUPESSimilar high concentration (23% vs 24%). Uses Vitamin E and Super Vitamin E for stability. More watery texture. May oxidize faster.
Classic L-AA formula with Vitamin E and Ferulic Acid for stability. Watery texture. Lower concentration (20%) but enhanced stability. Proven SkinCeuticals dupe.
Much lower concentration (8%) in anhydrous propanediol base. More stable formula. Better for beginners. Adds Alpha Arbutin for extra brightening.
Only 5% Vitamin C with higher pH (6) - much gentler but less potent. Great for sensitive skin beginners. Not as effective for stubborn pigmentation.
Comparison with competitors
SIDE-BY-SIDESkinCeuticals C E Ferulic
Storage & shelf life
2 MONTHS2 months after opening. L-Ascorbic Acid oxidizes quickly once exposed to air. Use promptly for best results.
Store in a cool, dark place away from direct sunlight. Refrigeration recommended to extend potency. Product may darken (yellow/orange) when oxidized.
Eco-friendly dark glass dropper bottle with removable label for recycling. Dropper exposes product to air with each use.
Yes, 30ml is under 100ml/3.4oz TSA limit. Keep sealed and cool during travel to prevent oxidation.
Frequently asked questions
FAQYes! Topical Vitamin C (L-Ascorbic Acid) is considered safe during pregnancy and breastfeeding. This serum contains no retinoids, salicylic acid, hydroquinone, or other pregnancy-unsafe ingredients. However, always consult your healthcare provider before adding new products during pregnancy.
Yes! This serum is verified fungal acne safe by SkinSort. It's free from ferments, fatty acids, esters, polysorbates, and oils that can feed malassezia yeast. The clean, minimal formula makes it an excellent brightening option for those prone to fungal acne.
Use caution when combining with other actives. You can use Vitamin C in the morning and retinol at night. Avoid using with AHAs/BHAs in the same routine as the combination may cause irritation. Allow 15-20 minutes between application of different actives, or alternate days for sensitive skin.
Best suited for dry, combination, and acne-prone skin types. The oily-serum texture provides hydration while brightening. Sensitive skin users should proceed with caution due to the 24% concentration - start with application every 3-4 days. Those with very oily skin may prefer a watery-textured Vitamin C.
Most users notice improved radiance and hydration within the first week. Visible brightening and fading of dark spots typically appears at 2-3 weeks. Significant improvement in hyperpigmentation, fine lines, and overall skin tone develops over 4-8 weeks of consistent use. Full collagen-building benefits emerge at 8-12 weeks.
Apply after cleansing and toning, before heavier serums and moisturizers. The rule is thinnest to thickest consistency. Wait 30-60 seconds for absorption before the next step. If using in the morning, always follow with SPF 30+. For evening use, apply before your night cream or sleeping mask.
No, this serum has a comedogenic rating of 0/5. It's free from pore-clogging oils, silicones, and heavy emollients. The propanediol base and minimal ingredient list make it safe for acne-prone and congestion-prone skin. It won't contribute to blackheads, whiteheads, or breakouts.
Use within 2 months of opening for optimal efficacy. L-Ascorbic Acid is unstable and oxidizes when exposed to air and light. Signs of oxidation include color change from clear to yellow/orange and a stronger metallic scent. Store in a cool, dark place or refrigerate to extend potency. Discard if the serum turns dark orange or brown.
Verdict: TIRTIR Pure Vitamin C24 Serum is a potent, well-formulated K-beauty option for those seeking aggressive brightening and anti-aging benefits. The 24% L-Ascorbic Acid concentration combined with Triple Collagen, CICA-7 Complex, and Argireline peptide delivers impressive results for hyperpigmentation, dullness, and early signs of aging. The clean, fragrance-free formula is fungal acne and pregnancy safe - a rarity at this concentration. However, the lack of stabilizing Vitamin E and Ferulic Acid means shorter shelf life, and the oily texture isn't for everyone. Best for experienced Vitamin C users with dry to combination skin who want maximum potency without breaking the bank compared to luxury options like SkinCeuticals.
Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Propanediol
Solvent, Viscosity Controlling, Viscosity Decreasing Agent
|
|
|
| 1 |
Ascorbic Acid
Skin Conditioning, Masking, Fragrance, Antioxidant, Ph Adjuster, Buffering Agent, Buffering
|
Promotes Wound Healing
Redness
Dark Spots
Texture
Pores
|
|
| 1 |
Betaine
Skin Conditioning, Humectant, Viscosity Controlling, Antistatic Agent, Hair Conditioning
|
Hydrating
Irritation
Dark Spots
|
|
| 0 |
Bisabolol
Masking, Skin Conditioning, Soothing
|
Redness
Irritation
Dark Spots
|
|
| 1 |
Water
Solvent, Skin Conditioning
|
|






