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When refilling a foaming facial cleanser, have you ever thought, “It should be fine as long as I use the same bottle”? In reality, it is not just about the formula itself. In cosmetic research and development, quality is assessed not only for the formula, but also for its compatibility with the packaging used. Foaming cleansers in particular can be sensitive because the condition and structure of the pump can affect the quality of the foam. Depending on how the product is refilled, the cleanser may not perform as originally intended. As these are products used on your skin every day, it is worth paying attention to how they are refilled. In this article, we will explain the key points to consider when refilling foaming cleansers, from a cosmetic R&D perspective, in as simple and practical a way as possible.
加賀 裕章 · 2 Jun 2026
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The pH of cleansing product is often discussed in skincare science and product formulation. You often hear that “weakly acidic pH is best for the skin.” But does that mean weakly alkaline cleansers should be avoided altogether? In a previous article, it was explained why the pH of the healthy skin surface (often referred to as “skin pH”) is maintained at a weakly acidic level, and how— from a formulation perspective — many weakly acidic cleansers are designed to minimize changes in skin pH during and after washing. For clarity, the term “skin pH” in this article refers to the pH of the skin surface. At the same time, many cleansers — including traditional soaps — are weakly alkaline. So is being weakly alkaline, in itself, a problem?
加賀 裕章 · 7 Mar 2026
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Healthy skin naturally maintains a weakly acidic pH of around 4–6. This article explains, from a skin science perspective, how sebum, sweat, enzymes, and skin microorganisms work together to maintain this acidity, and why it supports moisture retention, barrier function, and microbial balance.
加賀 裕章 · 6 Feb 2026
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Is that facial cleanser really right for your skin? Even highly rated products can sometimes leave your skin feeling tight or dry — and the reason might lie somewhere else. This article takes a closer look at pH as a helpful guide for choosing a facial cleanser, explains the thinking behind developing weakly acidic and weakly alkaline formulas, and shows you how to look up the pH of products you’re curious about and compare different cleansers.
加賀 裕章 · 6 Feb 2026
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