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Ingredient directory

5-isopropyltropolone

Also known as Hinokitiol, this naturally-derived antimicrobial compound functions as a metal-chelating agent with proven efficacy against acne-causing bacteria. Beyond its preservative properties, it demonstrates skin-brightening and anti-aging benefits through tyrosinase inhibition and collagen protection. Its versatility and gentle profile make it suitable for sensitive skin formulations requiring both antimicrobial activity and active skincare benefits.

Directory entry · Individual source review pending

This profile is awaiting an individual source review. Treat its ratings, dose estimates and compatibility labels as provisional; they are not medical advice or proof of a finished product’s effects.

antimicrobial preservative soothing antioxidant

Science

Mechanism of Action

Functions as a metal-chelating ionophore that binds iron and zinc to disrupt bacterial respiratory chains, while simultaneously suppressing tyrosinase activity to reduce melanin production, downregulating MMP-2 and MMP-9 enzymes to prevent collagen breakdown, and inhibiting NF-kB signaling pathways to reduce inflammation

Research

Clinical Evidence

High confidence
Effective range 0.01–1%
Optimal

0.05%

Key findings

  1. 01 Demonstrated effective antimicrobial activity against P. acnes at 0.05% concentration in commercial formulations
  2. 02 Established minimum inhibitory concentration of 0.01-0.1% for reducing acne lesions and preventing bacterial proliferation
  3. 03 Confirmed non-irritant status at 1.0% concentration in 48-hour closed patch testing

Transparency

Dusting Analysis

Not commonly dusted

Typically used at effective concentrations rather than trace amounts due to its dual role as both preservative booster and active ingredient

The Formula

Formulation

Solubility
Both
Optimal pH 5 – 7.5
0 7 14

Stability

Exhibits excellent stability in acidic to neutral conditions but degrades rapidly above pH 9; forms stable metal complexes that may cause color shifts, particularly reddish hues with iron contamination

Conflicts

  • Ferric ions (causes discoloration)
  • Strong oxidizing agents
  • Strongly alkaline bases

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1%
Sensitization risk Low

Listed in EU CosIng database as antimicrobial and anticorrosive; patch testing at 5% in petrolatum shows no sensitization or phototoxicity, though mild reactions possible in hypersensitive individuals at 1% in ethanol

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

A well-researched multifunctional ingredient that combines effective antimicrobial properties with meaningful anti-aging and brightening benefits at clinically-validated concentrations.

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