LEVEL 1 – pH OPTIMUM RETINOL SUSTAINING – 1000 IUs - Dr Koo Private Practice
LEVEL 1 – pH OPTIMUM RETINOL SUSTAINING – 1000 IUs - Dr. Koo Private Practice
LEVEL 1 – pH OPTIMUM RETINOL SUSTAINING – 1000 IUs - Dr. Koo Private Practice
LEVEL 1 – pH OPTIMUM RETINOL SUSTAINING – 1000 IUs - Dr. Koo Private Practice
LEVEL 1 – pH OPTIMUM RETINOL SUSTAINING – 1000 IUs - Dr. Koo Private Practice
Entry-level pH-Optimum Retinol — for sensitive or retinol-new skin

Dr Koo Level 1 Retinol | Sensitive Skin Renewal

$120.00
WHAT IT DOES Reduces Pores, Fine Lines, Boosts Collagen, Mildly Exfoliates
WHO ITS FOR Early age prevention or sensitive skin
KEY INGREDIENTS Retinol, Ginger Root, Marula Oil and Grapeseed Oil, Vitamin E, Ceramide
Quantity:
Pickup available at Dr Koo Private Practice Skincare Usually ready in 2-4 days

Dr Koo Level 1 Retinol | Sensitive Skin Renewal

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 1 is the entry point — a gentle, pre-dosed retinol that maintains your skin's collagen and elastin density and actively slows the aging curve. Ginger root, marula, and grapeseed oil carry the retinol deep into the skin's layers, while a light surface exfoliation refines pores and lifts luminosity. Vitamin E and ceramides reinforce the barrier so renewal never comes at the cost of comfort. Ideal for maintaining firmness and preventing early aging — and gentle enough for sensitive skin at any age.

Independent clinical evidence — this formulation system
Measured on Level 3 (5000 IUs). 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.

Level 1 is the same formulation system at a different retinol concentration (1000 IUs), matched to your skin's tolerance and need. The measurements above were taken on Level 3 (5000 IUs); they are not a result for Level 1.