Milk protein plus AHA/BHA: a two-front approach to nighttime exfoliation

Why "milk peel" combines two historically separate exfoliation traditions

Lactic acid, naturally present in milk and long used in traditional milk-bath skincare rituals, is itself a mild AHA — pairing milk protein and fermented milk filtrate with an additional, more concentrated AHA/BHA blend essentially modernises and intensifies a much older, gentler exfoliation concept into a more targeted, formulated serum.

What the AHA/BHA combination is doing on top of the milk base

AHAs (like glycolic or lactic acid) work primarily at the skin's surface to loosen dead cell buildup, while BHAs (like salicylic acid) are oil-soluble and can penetrate into pores themselves — combining both addresses surface texture and pore congestion simultaneously, a broader exfoliation approach than either acid type alone.

Why fermented milk filtrate and lactobacillus fermentation are included specifically

Beyond the peeling action, fermented milk-derived ingredients are associated with supporting the skin's barrier and microbiome balance — their inclusion alongside active exfoliants is a formulation choice aimed at offsetting some of the potential dryness or irritation that AHA/BHA combinations can otherwise cause on their own.

Why this is positioned specifically as a first step after cleansing at night

Applying an exfoliating serum immediately after cleansing, before other treatment products, ensures the acids contact freshly cleansed skin directly rather than competing with other actives already layered on — and formulating it for nighttime use avoids the photosensitivity concerns that AHA exfoliation typically carries during daytime sun exposure.

How to introduce a dual-acid, milk-based night serum safely

Even with the barrier-supportive milk components included, starting at two to three nights per week rather than nightly is a sensible way to gauge tolerance to the combined AHA/BHA action, increasing frequency gradually and always following with a barrier-supportive moisturiser to offset the exfoliation.