Dr Koo Level 1 Retinol | Sensitive Skin Renewal Shop-All and Sodium Hydroxide

and Sodium Hydroxide

to add a natural glisten and protective finish

Citric Acid

Pregnancy safe

RETINOL Level 3: Phytosterols stimulate collagen and elastin

Dr Koo Level 1 Retinol | Sensitive Skin Renewal Shop-All and Sodium HydroxideFormulated For Prevention, sensitive skin, retinol naive skin, or post procedure maintenance. This is the entry concentration where your skin learns to respond to retinoid signaling without overwhelming the barrier. The Mechanism At 1,000 IUs, Level 1 initiates retinoic acid receptor (RAR RXR) binding at threshold concentration. Retinol is converted intracellularly through a two step enzymatic process retinol to retinal, then retinal to retinoic acid