Skincare University

Microbiome and skin compatibility—the real reason it "doesn’t suit you"

LEVEL 4
What "Suits Your Skin" Means

※ The information in this section is based on Japanese cosmetics regulations (Pharmaceutical and Medical Device Act / 薬機法). Ingredient classifications, permitted concentrations, and labeling requirements may differ in your country or region.
LEVEL 4 What "Suits Your Skin" Means

"This product broke me out" -- what is actually happening beneath the surface? Recent research indicates that disruption of the skin microbiome (commensal flora) is a major contributing factor.

The Skin's Commensal Flora

Approximately 1,000 species of commensal bacteria inhabit healthy skin. S. epidermidis produces antimicrobial peptides and is also involved in ceramide production. The diversity and balance of this flora being maintained is a condition for healthy skin.

Balance of Skin Commensal Bacteria Beneficial Bacteria S. epidermidis Antimicrobial peptides Promotes ceramide production pH maintenance (acidic) Barrier function support Harmful Bacteria S. aureus Induces inflammation Barrier disruption Toxin secretion Worsens atopic dermatitis Balance Factors That Disrupt the Balance Over-cleansing / Alkaline products / Preservative antimicrobial action / Surfactant barrier disruption

The Mechanism Behind "Doesn't Suit My Skin"

Excessive antimicrobial action from preservatives kills beneficial bacteria along with harmful ones. Overly alkaline cleansing allows pathogenic bacteria to dominate. Surfactant-induced barrier disruption alters the habitat for commensal bacteria.

In other words, "this product didn't suit my skin" in many cases actually means "this product negatively impacted my microbiome".

KAIAN develops skincare products based on scientific evidence.
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