Alternative Whitening Ingredients for Sensitive Skin

Based on the previous discussion and your skin condition recovering from seborrheic dermatitis, using gentler whitening ingredients is recommended. Instead of Activated Resorcinol, you can consider using a combination of Vitamin B3 (Niacinamide) and GlucoBright™ (Acetyl Glucosamine).

These two ingredients work together effectively for skin brightening and reducing dark spots, while being less irritating than Activated Resorcinol. Vitamin B3 also offers additional benefits like strengthening the skin barrier, reducing redness, and improving skin hydration, which is beneficial for skin that has recently recovered from irritation.

For your formula, you can use:

• Vitamin B3 (Niacinamide): Recommended at 4-5%. You can choose between Safe-B3™ or Extreme-B3™. Extreme-B3™ is the purest form and is exceptionally gentle, even suitable for sensitive or recovering skin.
• GlucoBright™: Recommended at 4%.

This combination is generally well-tolerated and works effectively within a typical cosmetic pH range (pH 3-7 for GlucoBright, pH 3-8 for Vitamin B3), so you likely won't need to worry about significant pH adjustments compared to Activated Resorcinol.

Given that your skin is still recovering, starting with these milder options is a good approach to achieve brightening effects without risking irritation.