BHA Tonik
- Routine step
- Moisturizer
- When
- Morning and evening
Apply as the last step in the evening, and before sunscreen in the morning. A fingertip-sized amount covers the face.
Ingredient research in this formula
These are ingredient-level research links, not evidence that this exact product has been clinically tested.
Replenishes one of the actual humectant molecules your own skin makes. Levels drop in eczema and with age, so topping it up genuinely helps dry, dehydrated, or atopic-prone skin feel less tight.
Good for: Hydrating, Barrier repair
Evidence behind the ingredients
Real citations from our research database, one per tracked active in this product. Click any ingredient name to read its full evidence dossier.
Replenishes one of the actual humectant molecules your own skin makes. Levels drop in eczema and with age, so topping it up genuinely helps dry, dehydrated, or atopic-prone skin feel less tight.
Novel design of pyrrolidonecarboxylic acid and sodium dilauramidoglutamide lysine complex for targeted drug delivery to human stratum corneum, International Journal of Pharmaceutics 2025
Baldwin H, Del Rosso J, Going Beyond Ceramides in Moisturizers: The Role of Natural Moisturizing Factors, Journal of Drugs in Dermatology 2024: review establishing PCA (pyrrolidone carboxylic acid) as a core skin natural moisturizing factor alongside amino acids, urea, lactate, and electrolytes; essential to barrier function and xerosis treatment
Li L et al., Association Between Skin Acid Mantle, Natural Moisturizing Factors, and Antibacterial Activity Against S. aureus in the Stratum Corneum, Clinical Cosmetic and Investigational Dermatology 2023: PCA and urocanic acid as NMF components contribute to skin antibacterial defense; 1-unit pH drop = 68.1% S. aureus cell death
Sources: 10 clinical journals and regulatory databases across the US, EU, Korea, Japan, and China. Every entry points to a specific document. See methodology for the full list and what each outcome label means.
Similar comparisons
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