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Moumoujus

HYDROXYPHENOXY PROPIONIC ACID.

Valuable CAS 94050-90-5 / SKIN CONDITIONING

Hydroxyphenoxy Propionic Acid is an advanced skin-brightening and spot-fading active ingredient. It functions by significantly reducing melanin production and release within melanocytes, providing a distinct mechanism from traditional tyrosinase inhibitors, while also improving skin texture and offering photoprotective and anti-inflammatory benefits.

Summary

skin brightening spot fading skin conditioning photoprotective anti-inflammatory

Science

Mechanism of Action

This active primarily targets hyperpigmentation by decreasing the melanin levels produced by melanocytes in a dose-dependent manner. Crucially, it reduces the release of melanin from these cells without leading to melanin accumulation within them, a process distinct from direct tyrosinase inhibition. Furthermore, it enhances overall skin texture and hydration as a conditioning agent and demonstrates photoprotective and anti-inflammatory actions on epidermal keratinocytes, aiding in the prevention of UVB-induced skin damage.

Research

Clinical Evidence

High confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 In a 12-week L'Oreal sponsored study, a multi-ingredient formulation including Hydroxyphenoxy Propionic Acid achieved skin-lightening results comparable to a prescription-strength regimen of 4% hydroquinone and 0.025% tretinoin.
  2. 02 In vitro research indicates that Hydroxyphenoxy Propionic Acid reduces melanin production in melanocytes dose-dependently, exhibiting a lower IC50 than both kojic acid and arbutin, with no cytotoxicity observed at concentrations 300 times its effective IC50.
  3. 03 Three distinct in vivo clinical trials involving Caucasian and Asian participants demonstrated a reduction in age spots and an improvement in complexion evenness following 14 to 56 days of application on the face, hands, and forearms.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 4.5 – 6.5
0 7 14

Stability

Stable under normal temperatures and pressures. Optimal storage conditions include cool temperatures, away from direct sunlight and moisture, in an airtight container.

Synergies

  • ellagic acid
  • yeast extract
  • salicylic acid

Conflicts

  • strong acids
  • strong bases

Safety

Safety Profile

CIR Status
Not reviewed
Pregnancy
Caution
Sensitization risk Moderate

While generally deemed safe for topical use, a preliminary tolerance patch test is strongly recommended due to potential for mild irritation, particularly on very sensitive skin. Reported potential side effects include skin irritation, redness, itching, and dryness. Safety data sheets classify it as a moderate hazard, noting it can cause serious eye irritation and damage, and may induce skin inflammation that could worsen pre-existing dermatitis. Due to insufficient research on its topical use during pregnancy and breastfeeding, consultation with a healthcare professional is advised for these individuals.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Hydroxyphenoxy Propionic Acid is a valuable active for significant skin brightening and spot correction, exhibiting high efficacy in addressing hyperpigmentation, though it requires diligent formulation and sensitivity considerations given its moderate irritancy potential.

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