Please note AVST 1 is the lowest concentration of vitamin A and is what we recommend beginning with and working your way up to AVST 5.
AVST 5 is the fifth and final step moisturizer in the AVST step-up system and contains the highest concentrations of vitamin A and C and a variety of antioxidants, peptides and moisturizing ingredients that leave your skin feeling revitalized and refreshed with a more youthful appearance.