{"id":19057,"date":"2026-06-16T18:20:03","date_gmt":"2026-06-16T11:20:03","guid":{"rendered":"https:\/\/www.tibdglobal.com\/product\/photostability-testing\/"},"modified":"2026-10-01T16:07:59","modified_gmt":"2026-10-01T09:07:59","slug":"photostability-testing","status":"publish","type":"product","link":"https:\/\/www.tibdglobal.com\/en\/product\/photostability-testing\/","title":{"rendered":"Photostability Testing Service (Light Stability Testing) in Accordance with ICH Q1B"},"content":{"rendered":"
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Many products in the health and beauty industry contain light-sensitive active ingredients. Exposure to light during transport, retail storage, and consumer use can cause active substances to degrade, produce breakdown products that may pose safety concerns, and reduce product performance below the levels stated on the label.<\/p>\r\n

Photostability Testing in accordance with the ICH Q1B standard is a legally and technically required condition for products making efficacy claims: sunscreens claiming an SPF value, vitamin C serums claiming a specific concentration, retinol serums claiming anti-ageing performance, and herbal products claiming a quantified marker compound content.<\/p>\r\n

TIBD’s Photostability service covers protocol design in accordance with ICH Q1B, controlled light exposure using a Photostability Chamber equipped with D65 or equivalent lamps, chemical and physical change analysis following light exposure, and result interpretation to support Thai FDA registration and export market expansion, in collaboration with VISBIO as an Independent Quality Assurance Verifier (IQAV).<\/p>\r\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]\n\t\t

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<\/span>What Is Photostability Testing, and Why Is It Necessary?<\/span><\/h4>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\n\t\t[vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]\r\n

Photostability Testing is a study that evaluates the effect of light on a product’s characteristics across chemical, physical, and performance dimensions, under controlled light energy conditions aligned with international standards. ICH Q1B designates this testing as a mandatory component for pharmaceutical products and a standard accepted by regulatory authorities across cosmetics and dietary supplements.<\/p>\r\n

There are three key reasons why products require Photostability Testing. The first is scientific: photodegradation results from light energy reacting with the chemical structure of active ingredients. Products containing double bonds, aromatic compounds, or dyes are particularly susceptible and can degrade within hours without a photostabilization system in place. The second is regulatory: the Thai FDA expects Photostability data for products making efficacy claims, and this data forms part of the Product Information File for Cosmetic Notification submissions. The third concerns market safety: products that degrade under light may produce irritant or unsafe breakdown products, presenting a reputational risk if consumers are affected.<\/p>\r\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]\n\t\t

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<\/span>Products That Require Photostability Testing<\/span><\/h4>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\n\t\t[vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]\r\n

Several product categories in Thailand’s health and beauty industry require Photostability testing, both for registration documentation and during the product development process.<\/p>\r\n\r\n