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Moumoujus

TANNIC ACID.

Questionable CAS 1401-55-4 / ASTRINGENT, FRAGRANCE

Tannic Acid is a potent polyphenol acclaimed for its diverse benefits in skincare, primarily recognized for its robust antioxidant, anti-inflammatory, and astringent properties. It has been observed to diminish the visibility of age spots and alleviate skin redness, contributing to a refined and smoother complexion.

Summary

astringent masking antioxidant anti-inflammatory antibacterial skin-barrier enhancer collagenase/elastase inhibitor photoprotective

Science

Mechanism of Action

Tannic acid exerts its effects by inhibiting key inflammatory pathways, including the downregulation of pro-inflammatory cytokines such as TNF-α and IL-6, and enzymes like COX-2, thereby reducing tissue swelling and redness. Its astringent action constricts skin cells and pores, promoting a smoother texture and minimizing oiliness. As a potent antioxidant, it neutralizes free radicals, safeguarding the skin from oxidative stress and environmental damage, including UV-induced aging signs like fine lines. Furthermore, it possesses antibacterial properties against acne-causing bacteria, supports skin healing, strengthens the skin barrier for improved moisture retention, and inhibits collagenase and elastase enzymes responsible for collagen and elastin degradation.

Research

Clinical Evidence

Medium confidence
Effective range 2–2%
Optimal

2%

Key findings

  1. 01 In a 'Tannic serum' formulation, a 2% concentration was found to reduce the appearance of age spots and relieve skin redness.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 4.5 – 5.5
0 7 14

Stability

Tannic acid is sensitive to light and heat, requiring storage in a cool, dry place, protected from light, and in a tightly sealed container to prevent degradation. Aqueous solutions are weakly acidic and susceptible to oxidation, which is accelerated in alkaline conditions. Stability is enhanced in glycerin solutions.

Conflicts

  • Strong oxidizing agents
  • Bases (caustics)
  • Trivalent iron ions (causes blue-black color)
  • Gelatin (forms precipitate)
  • Alkaloids (forms precipitate)
  • Metal ions (e.g., lead, aluminum, zinc - forms insoluble complexes/salts)
  • Activated charcoal (interferes with adsorbent action)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Moderate

While classified as Generally Recognized As Safe (GRAS) by the FDA for food additive purposes, topical application of Tannic Acid is considered 'POSSIBLY UNSAFE' on tender or damaged skin. This is due to concerns regarding systemic absorption that could potentially lead to liver damage, and it can cause tissue necrosis in burned areas. Skin irritation has been reported. It is not classified as carcinogenic, mutagenic, or a reproductive toxicant, and received an EWG Skin Deep hazard score of 1 ('fair').

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Medium
Comedogenicity Unknown

Our Assessment

Verdict

Questionable

Despite promising antioxidant, anti-inflammatory, and astringent capabilities, the significant safety concerns regarding topical absorption on compromised skin and reported medium irritancy warrant a highly cautious approach in precision skincare formulations.

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