Water permeability and ablution-friendly skincare products: analysis from the perspective of Fiqh Al-Ṭahārah

The growing demand for halal and ablution-friendly skincare products among Muslim women reflects increasing awareness of religious obligations related to fiqh al-ṭahārah, which governs women’s adornment, skincare practices, and ritual purity. However, the term “ablution-friendly” remains conceptually ambiguous within the cosmetic industry due to the absence of standardized definitions, scientific validation, and Shariah-integrated regulatory mechanisms, while existing halal certification standards such as Malaysia’s MS2634:2019 do not require water permeability testing, leading to inconsistent claims and consumer confusion. This study analyses water permeability and ablution-friendly skincare products from the perspective of fiqh al-ṭahārah according to the al-Shāfiʿī school, employing a qualitative methodology that includes a systematic literature review and semi-structured interviews with experts in Shari’ah, halal studies, fiqh, and the cosmetic industry, with data analysed thematically. Classical al-Shāfiʿī jurists consistently emphasize that the validity of wuḍūʾ depends on direct water contact with the skin, ruling that substances forming a tangible barrier characterised by properties similar to wax (shamʿ), dough (ʿajīn), or henna (ḥināʾ) invalidate ablution if they prevent water from reaching the skin. Although henna is permissible as adornment for women, its juristic relevance lies not in its colour but in whether it leaves a physical layer that obstructs water, a principle central to fiqh al-nisāʾ considerations of lawful beautification without compromising worship. Building upon these juristic foundations, this study integrates classical Shariah principles with modern scientific perspectives by critically reviewing gravimetric and dye diffusion methods as reported in existing literature, in order to conceptually assess discussions on water permeability in skincare products. The proposed fiqh al-ṭahārah based assessment framework offers practical regulatory guidance for halal authorities such as JAKIM, JAIN, and the Department of Standards Malaysia, supporting more rigorous halal certification practices, encouraging the development of genuinely Shariah-compliant skincare formulations, and empowering Muslim women to make informed, faith-aligned choices that preserve the integrity of Islamic worship and strengthen trust in the halal cosmetic industry.