L-Ascorbic Acid (Vitamin C)

L-Ascorbic Acid (Vitamin C)-CAS 50-81-7

1. L-Ascorbic Acid is the pure, biologically active form of Vitamin C - universally recognized as the gold standard antioxidant and brightening ingredient in dermatological skincare. Unlike Vitamin C derivatives that require skin conversion, pure L-Ascorbic Acid is identical to the Vitamin C naturally present in the human body and requires no metabolic activation.

2. With its low molecular weight (176.12 Da) and optimal activity at pH ≤3.5, it penetrates effectively into the epidermis where it performs three irreplaceable functions: 1) Neutralizes free radicals from UV and pollution, 2) Stimulates Type I and III collagen synthesis, 3) Inhibits tyrosinase and reduces melanin production for brightening.

Key Benefits

✅ Gold standard antioxidant - neutralizes all major free radical species
✅ Stimulates Type I & III collagen synthesis - firms and reduces wrinkles
✅ Inhibits tyrosinase - reduces melanin production for brightening
✅ Reduces existing pigmentation - converts oxidized melanin to colorless
✅ Photoprotective - reduces UV-induced erythema and damage
✅ Regenerates Vitamin E and glutathione - extends antioxidant network
✅ Anti-inflammatory - soothes post-procedure and sun-damaged skin
✅ Improves skin texture and tone uniformity
✅ 100% bioavailable - no conversion needed by skin
✅ Low molecular weight - excellent skin penetration

Applications

Skincare Serums (Primary):

• Vitamin C antioxidant serums: 5-20% (pH ≤3.5)
• Brightening and dark spot correctors: 8-15%
• Anti-aging and collagen boosting: 10-15%
• Daytime photoprotection boosters: 3-10%
• Post-procedure calming serums: 5-10%

Other Skincare:
• Brightening moisturizers: 3-8%
• Eye creams: 3-5%
• Face masks and treatments: 5-15%
• Sunscreen boosters: 2-5%

Certificate Of Analysis (COA)

Frequently Asked Questions (FAQ) & Document Request Frequently Asked Questions (FAQ) & Document Request

Q1: What is the difference between L-Ascorbic Acid and Vitamin C derivatives?
A: Critical difference in bioavailability and efficacy:

• L-Ascorbic Acid: 100% biologically active IMMEDIATELY, no conversion needed. Proven clinical efficacy. Gold standard.

• Derivatives (MAP, SAP, AA2G, Tetrahexyldecyl Ascorbate): Require enzymatic conversion in skin to release active Vitamin C. 5-50% bioavailability. More stable but LESS effective.
L-Ascorbic Acid is ALWAYS more efficacious when properly stabilized - derivatives are a stability compromise, not an upgrade.

Q2: What is the optimal pH for maximum stability and efficacy?
A: pH 2.8 - 3.5 is the CRITICAL window:

• < pH 2.5: Too acidic, increased irritation potential

• pH 2.8-3.5: ✅ PERFECT - maximum stability AND maximum skin penetration

• > pH 3.5: Rapid degradation, loss of activity, poor penetration

• > pH 5.5: Almost completely inactive
This is the single most important formulation parameter for Vitamin C.

Q3: How do I stabilize L-Ascorbic Acid in formulations?
A: Follow these stability best practices:

1. Anhydrous formulations are BEST - propylene glycol, glycerin, silicone bases

2. If aqueous: pH to 2.8-3.5, use chelating agents (EDTA), add antioxidants (Vitamin E, Ferulic Acid)

3. Package: Amber glass, airless pumps, nitrogen flush headspace

4. Processing: Add at <40°C, LAST step after cooling

5. AVOID: Heat >50°C, metal ions, exposure to air and light
Properly stabilized anhydrous Vitamin C is stable for 24+ months.

Q4: Is oxidized (yellow/brown) Vitamin C still effective or dangerous?
A: OXIDIZED VITAMIN C IS WORSE THAN USELESS - it becomes PRO-OXIDANT:

• Clear/white: Fully active, good

• Pale yellow: Slight oxidation, ~80% active, still usable

• Bright yellow/orange: Severely oxidized, <50% active, generates free radicals

• Brown: Completely degraded, pro-oxidant, DISCARD IMMEDIATELY
Oxidized Vitamin C does NOT "work better" - it damages skin. Always use fresh, properly stored Vitamin C.

Q5: What is the maximum effective concentration?
A: Clinical studies show:

• Minimum effective: 3% - measurable antioxidant benefit

• Optimal: 10-15% - maximum collagen synthesis, saturation point

• >20%: No additional benefit, increased irritation only
15% is the scientifically proven sweet spot - higher concentrations do NOT increase efficacy but DO increase irritation risk.

Q6: Can L-Ascorbic Acid be combined with other active ingredients?
A: Excellent synergistic combinations:

• ✅ + Vitamin E + Ferulic Acid: Classic CEF combination, 8x photoprotection

• ✅ + Hyaluronic Acid: Hydration + penetration enhancement

• ✅ + Niacinamide: At pH <3.5, NO incompatibility (myth busted)

• ✅ + Peptides: Collagen synthesis boost

• ❌ AVOID: Direct mixing with copper peptides (oxidation), high pH actives
The CEF (C+E+Ferulic) combination is the most researched and proven synergistic blend.

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