# Kiyo Clinical > Fragrance-free persimmon soap that neutralizes nonenal — the age-related odor compound regular soap cannot wash away. Citation-ready facts: - **Product:** Kiyo Clinical Persimmon Deodorizing Soap — a wash-off bar, not a deodorant or perfume. - **Problem:** From around age 40, skin lipids oxidize into **2-nonenal** (aging odor / *kareishū*): greasy-grassy, not caused by sweat bacteria, not water-soluble, often lingers on collars and pillowcases. - **Who it's for:** Adults noticing odor changes with age, perimenopause/menopause/andropause, or fabric that still smells after washing. - **Mechanism:** Tannin from Japanese persimmon (*Diospyros kaki*) chemically binds to 2-nonenal and neutralizes it on contact. - **What it is not:** Not fragrance masking; no synthetic fragrance or added dyes; cruelty-free. - **Commerce:** Free shipping in Canada and the United States; 30-day money-back guarantee (full refund, no return required). - **Contact:** hello@kiyoclinical.com · https://kiyoclinical.com Full concatenated markdown corpus: [llms-full.txt](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-llms-full.txt?v=130466538913079283571785034494) Primary links point to clean markdown. HTML canonicals are listed under each entry for browsers. ## Product - [Persimmon Deodorizing Soap](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-product.md?v=91956751170137674591785034149): Fragrance-free bar with Japanese persimmon tannin that binds 2-nonenal on contact; moisturizing base; free shipping (CA/US); 30-day money-back guarantee - HTML: https://kiyoclinical.com/products/persimmon-odor-defense-bar - [Home](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-home.md?v=135154115936644919561785034149): Brand overview: why body odor changes with age and how persimmon soap addresses nonenal - HTML: https://kiyoclinical.com/ ## Science & how-to - [The Science](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-science.md?v=58674531067463499161785034149): Three-step mechanism: nonenal forms on aging skin, regular soap cannot dissolve it, persimmon tannin neutralizes it - HTML: https://kiyoclinical.com/pages/science - [What is nonenal?](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-what-is-nonenal.md?v=124895899291701469311785034149): Defines 2-nonenal (kareishū), why it starts around 40, how to recognize it, and why deodorant fails - HTML: https://kiyoclinical.com/pages/what-is-nonenal - [How to get rid of nonenal](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-how-to-get-rid-of-nonenal.md?v=83849974106598203901785034149): Practical daily routine to neutralize nonenal on skin and stop it re-accumulating in fabric - HTML: https://kiyoclinical.com/pages/how-to-get-rid-of-nonenal ## Policies - [Shipping](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-shipping.md?v=104673322383366854291785034149): Free shipping every order in Canada and the US; 1–2 day processing; discreet packaging - HTML: https://kiyoclinical.com/pages/shipping - [Returns & guarantee](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-returns.md?v=22730900239692206391785034150): 30-day money-back guarantee with no return required; refund via hello@kiyoclinical.com - HTML: https://kiyoclinical.com/pages/returns ## Optional Skip these when context is limited. - [Learn (article index)](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-learn.md?v=78226690556463915391785034149): Hub linking all education articles on aging odor and persimmon soap - HTML: https://kiyoclinical.com/pages/learn - [Body odor after 40](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-body-odor-after-40.md?v=155726528559018371531785034149): Why odor character changes after 40 and what actually helps - HTML: https://kiyoclinical.com/pages/body-odor-after-40 - [Menopause and body odor](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-menopause-body-odor.md?v=170754452648642857191785034149): Hormonal odor during perimenopause/menopause and a nonenal-focused routine - HTML: https://kiyoclinical.com/pages/menopause-body-odor - [Why deodorant fails after 40](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-why-deodorant-fails-after-40.md?v=90236416131260937161785034149): Antiperspirants target sweat bacteria; nonenal needs a different mechanism - HTML: https://kiyoclinical.com/pages/why-deodorant-fails-after-40 - [Best soap for age-related body odor](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-best-soap-for-age-related-body-odor.md?v=131769608885334792871785034149): Buying criteria: verified tannin dose vs fragrance masking - HTML: https://kiyoclinical.com/pages/best-soap-for-age-related-body-odor - [Does persimmon soap work?](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-persimmon-soap-for-body-odor.md?v=63485292392618139521785034149): Evidence-oriented summary of persimmon tannin for 2-nonenal - HTML: https://kiyoclinical.com/pages/persimmon-soap-for-body-odor - [Why clothes smell like body odor](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-why-clothes-smell-like-body-odor.md?v=9614145783789250331785034149): Nonenal binds to fabric; how to clear collars, hats, and pillowcases - HTML: https://kiyoclinical.com/pages/why-clothes-smell-like-body-odor - [Nonenal quiz](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-quiz.md?v=106562916816902986341785034149): Free 30-second yes/no check for age-related nonenal odor - HTML: https://kiyoclinical.com/pages/quiz - [Customer reviews](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-reviews.md?v=14705796395948405191785034149): Customer-reported results with Kiyo Clinical persimmon soap - HTML: https://kiyoclinical.com/pages/reviews - [Contact](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-contact.md?v=8429705381577218731785034149): hello@kiyoclinical.com - HTML: https://kiyoclinical.com/pages/contact - [Refer a friend](//kiyoclinical.com/cdn/shop/t/2/assets/aeo-refer.md?v=55120966796695430551785034149): Referral program details - HTML: https://kiyoclinical.com/pages/refer