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STRATUM Skin Science

FRM Formula

Toner

AHA Renewal Toner 8%

Surface exfoliation without skipping the humectant most acid toners leave out.

$42 150ml

8% combined glycolic and lactic acid, buffered to a pH intended for repeated use rather than a single aggressive peel. Both acids work by loosening the bonds between corneocytes at the surface, encouraging more even shedding — they do not reach past the corneum, and nothing about this formula is intended to.

Sodium hyaluronate is included because an acid toner that strips without replacing surface moisture is a formulation shortcut, not a feature.

Built around

  • Glycolic / Lactic Acid Corneum

    Loosens the bonds between corneocytes at the surface, encouraging them to shed more evenly.

  • Hyaluronic Acid (mixed MW) Epidermis

    Higher molecular weights hold water at the surface; lower molecular weights are formulated to reach further into the viable epidermis.

Where this formula works

INCI Full Ingredient List

Full INCI ingredient list, in formulated order
# INCI Name
01 Aqua
02 Glycolic Acid
03 Lactic Acid
04 Sodium Hyaluronate
05 Glycerin
06 Aloe Barbadensis Leaf Juice
07 Panthenol
08 Sodium Hydroxide
09 Xanthan Gum
10 Phenoxyethanol
11 Ethylhexylglycerin

Listed in descending order of concentration, as required for cosmetic labelling. Trace/regulatory-threshold ingredients appear last.

USE How To Use

PM, 2-4 nights per week to start. Increases sun sensitivity -- daily SPF is required while this is in rotation. Do not combine with the retinol treatment on the same night; alternate nights instead. Patch test before first use.