LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs - Dr Koo Private Practice
LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs - Dr. Koo Private Practice
LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs - Dr. Koo Private Practice
LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs - Dr. Koo Private Practice
LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs - Dr. Koo Private Practice
LEVEL 3 – pH OPTIMUM RETINOL REPAIRING - 5000 IUs - Dr. Koo Private Practice
5000 IU pH-Optimum Retinol — Independently Measured Results

Dr Koo Level 3 Retinol | Advanced Renewal Serum

$185.00
WHAT IT DOES Fine lines and wrinkles measured 13.4% improved at 8 weeks (Visia), elasticity +16.1% (Cutometer), zero irritation — independent study on this concentration. Stimulates Collagen and Elastin, Softens Lines, Improves Firmness, Boosts Radiance
WHO ITS FOR Moderate to Advanced Wrinkles, Irregular Texture, Noticeable Pores
KEY INGREDIENTS Retinol, Essential Fatty Acids, Vitamins A, D and E, hexylresorcinol, phytosterols
Quantity:
Pickup available at Dr Koo Private Practice Skincare Usually ready in 2-4 days

Dr Koo Level 3 Retinol | Advanced Renewal Serum

Dr Koo Private Practice Skincare

Pickup available, usually ready in 2-4 days

10435 Clayton Road
Suite 120
Frontenac MO 63131
United States

+13149848331
Complimentary Shipping on Every Order

Level 3 advances to 5000 IUs of buffered retinol — kind to skin yet powerful enough for visible regeneration. It actively stimulates collagen and elastin to plump and firm, reinforced by essential fatty acids, Vitamin D, and Vitamin E to strengthen the skin barrier against further damage. Hexylresorcinol brightens and evens tone as a gentle surface exfoliation softens lines and restores radiance.

Independent clinical evidence — this formulation
Essex Testing Clinic · 33 women, ages 46–69 · nightly use for 8 weeks · evaluated at baseline, 4 and 8 weeks · each participant compared with her own baseline.

  • Fine lines & wrinkles (Visia CR 2.2 imaging): 8.9% improvement at 4 weeks, 13.4% at 8 weeks — 100% of participants improved
  • Elasticity (Cutometer): +8.4% at 4 weeks, +16.1% at 8 weeks — 94% improved
  • Firmness (Cutometer): 28.6% improvement at 4 weeks — 91% improved
  • Radiance (imaging): improved at 4 and 8 weeks — 70% improved at 8 weeks
  • Irritation: none observed in any participant at any visit; 97% reported no significant sensitivity compared with other retinols

All improvements above were statistically significant (p<0.001, except radiance at 4 weeks p=0.032). Signed final report on file.

Levels 1, 2 and 4 are the same formulation system at different retinol concentrations, matched to your skin's tolerance and need. The measurements above were taken on Level 3.