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Moumoujus

CITRIC ACID.

Valuable CAS 77-92-9 / 5949-29-1 / BUFFERING, CHELATING, FRAGRANCE

A multifaceted Alpha Hydroxy Acid (AHA) and organic buffer utilized in precision skincare to refine skin texture and stabilize complex formulas. While celebrated for its gentle exfoliating properties, it also serves as a potent antioxidant and pH regulator essential for maintaining the skin's protective acid mantle.

Summary

Exfoliant pH Adjuster Antioxidant Chelating Agent Astringent

Science

Mechanism of Action

As a keratolytic agent, it weakens the desmosomal bonds between dead skin cells to accelerate cellular turnover and unclog pores. It concurrently inhibits tyrosinase to disrupt melanin synthesis for brightening effects, while its chelating properties neutralize metal ions to prevent formula degradation. Furthermore, it acts as an antioxidant to mitigate oxidative stress caused by UV exposure.

Research

Clinical Evidence

High confidence
Effective range 1–20%
Optimal

5%

Key findings

  1. 01 Concentrations of 1-5% facilitate gentle exfoliation, brighten pigmentation via tyrosinase inhibition, and optimize the absorption of peptides by maintaining a skin pH of 4-5.
  2. 02 Daily application at 5-10% is clinically shown to enhance skin tone and texture while maintaining overall skin health and barrier integrity.
  3. 03 High-strength application at 20% over a three-month period increases epidermal thickness and dermal glycosaminoglycan content, effectively repairing sun-damaged tissue.
  4. 04 Professional-grade solutions (20-70%) are utilized in controlled chemical peels to significantly improve advanced skin irregularities.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
1%
Red flag below
0.5%

Citric acid is frequently included in formulations at very low concentrations (<1%) strictly as a pH adjuster or buffering agent. While essential for formula stability, these levels are insufficient for active exfoliation. It is considered 'dusted' when a product is marketed as an AHA treatment but utilizes citric acid only for pH balancing.

The Formula

Formulation

Solubility
Water
Optimal pH 3 – 6
0 7 14

Stability

Highly effective as a buffering agent to stabilize pH and optimize preservative performance. Cosmetic-grade citric acid typically maintains a pH of 3-4; it is incompatible with anhydrous (water-free) environments.

Synergies

  • Peptides (enhances absorption at pH 4-5)
  • Lactic Acid
  • Glycolic Acid
  • Antioxidants

Conflicts

  • Retinol (increases irritation risk)
  • Anhydrous formulations
  • High pH environments (>6.0)
  • Metal ions like iron and magnesium (may cause precipitation)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10%
Sensitization risk Low

Considered safe at concentrations ≤10% for consumer use. High-concentration formulas (>15%) or those with a pH below 2.5 may cause irritation or chemical burns. Users must apply broad-spectrum sunscreen as AHAs increase photosensitivity.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

An essential dual-purpose ingredient that functions both as a gentle skin-refining AHA and a critical stabilizer for precision skincare chemistry.

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