Environ Vita-Peptide C-Quence Serum 4Environ Vita Peptide C Quence Serum 4 contains ultra high concentrations of vitamins A, C & E and is the fourth level in Environ's signature Vitamin A step up system. Allowing for unsurpassed penetration of the skin, C Quence Serum 4 allows for the effective & safe lightening of pigmentation marks. It should only be used by those who have already acclimatised to C Quence 1, 2 and 3, or the Retinol series. C Quence Serum 4 is the most effective product