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Ingredient directory

Caesalpinia Sappan Stem Extract

A multifunctional botanical extract derived from Sappan Wood, historically used for its natural pigments and therapeutic properties. In precision skincare, it serves as a potent antioxidant and antimicrobial agent that helps clarify the complexion while evening out skin tone.

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.

antioxidant skin conditioning soothing antimicrobial brightening

Science

The extract operates through a high concentration of brazilin and flavonoids, which inhibit tyrosinase activity to modulate melanin production. It further provides anti-inflammatory benefits by suppressing nitric oxide (NO) and iNOS production, while boosting the skin's internal defense systems via the Nrf2/HO-1 signaling pathways to neutralize oxidative stress.


Research

High confidence
Effective range 0.02–2%
Optimal

0.5%

Key findings

  1. 01 Demonstrated complete (100%) inhibition of common acne-causing and inflammatory pathogens, including P. acnes and S. aureus.
  2. 02 Established standard range for achieving meaningful antioxidant support and skin-tone brightening in leave-on cosmetic applications.

Transparency

Commonly dusted
Min. effective
0.02%
Red flag below
0.01%

Because clinical antimicrobial activity is observed as low as 0.02%, many brands include it at 'fairy dust' levels below this threshold to claim its benefits without achieving biological efficacy. For brightening and antioxidant protection, a concentration of at least 0.2% is required.


The Formula

Solubility
Water
Optimal pH 4.5 – 6.5
0 7 14

Stability

Highly chromogenic and pH-sensitive; the extract shifts from yellow to deep purple as pH increases. It must be incorporated during the cool-down phase below 40°C to preserve polyphenol integrity.

Synergies

  • Vitamin C (stabilizing antioxidants)
  • Niacinamide (enhanced brightening)
  • Salicylic Acid (synergistic acne control)

Conflicts

  • High heat (>45°C)
  • Strong oxidizing agents
  • Alkaline environments (pH > 7.0)

Safety

CIR Status
Not reviewed
Max tested
2%
Pregnancy
Safe
Sensitization risk Low

While a formal CIR monograph is pending, it is recognized by the EU Cosing and US VCRP. It holds a Primary Irritation Index (PII) of 0, indicating an excellent safety profile for topical use.


Your Skin

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

Our Assessment

Valuable

An exceptional multi-tasking botanical that provides verified antimicrobial and brightening benefits when formulated within a strict pH range.


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