{"id":230644,"date":"2026-06-26T09:03:37","date_gmt":"2026-06-26T07:03:37","guid":{"rendered":"https:\/\/www.parisselectbook.com\/2026\/06\/26\/12m-symbol-this-mark-on-the-tube-indicates-whether-your-sunscreen-from-last-summer-is-still-usable\/"},"modified":"2026-06-26T09:03:37","modified_gmt":"2026-06-26T07:03:37","slug":"12m-symbol-this-mark-on-the-tube-indicates-whether-your-sunscreen-from-last-summer-is-still-usable","status":"publish","type":"post","link":"https:\/\/www.parisselectbook.com\/en\/2026\/06\/26\/12m-symbol-this-mark-on-the-tube-indicates-whether-your-sunscreen-from-last-summer-is-still-usable\/","title":{"rendered":"&#8220;12M symbol&#8221;: This mark on the tube indicates whether your sunscreen from last summer is still usable"},"content":{"rendered":"<p>Every time summer begins, the same doubt creeps up from the bottom of my beach bag: that tube of <strong><a href=\"https:\/\/www.parisselectbook.com\/en\/2026\/06\/23\/i-tried-this-e18-korean-sunscreen-that-went-viral-on-tiktok-it-replaced-my-day-cream-all-summer-long\/\">sunscreen<\/a><\/strong> I found left over from last summer still effective? The answer depends on several concrete indicators, and one sign in particular\u2014clearly visible on the packaging\u2014makes all the difference. <\/p>\n<h2>The first thing to look for on a tube of sunscreen<\/h2>\n<p>On any sunscreen product, there is a small pictogram that deserves your full attention. It is the <strong><a href=\"https:\/\/www.parisselectbook.com\/en\/2026\/06\/24\/you-can-use-it-a-year-later-this-mark-on-the-tube-tells-you-whether-your-sunscreen-from-last-summer-is-still-safe\/\">Shelf Life After Opening (SLAO)<\/a><\/strong>, represented by a small open jar followed by a number: \u201c12M\u201d or \u201c18M.\u201d Most tubes indicate <strong>\u201c12M<\/strong>,\u201d which means the product must be used within one year of first opening.  <\/p>\n<p>So, if you opened your bottle last June, the theoretical expiration date is this June. After that date, the UV filters degrade and the <strong><a href=\"https:\/\/www.parisselectbook.com\/en\/2026\/06\/24\/you-can-use-it-a-year-later-this-mark-on-the-tube-tells-you-whether-your-sunscreen-from-last-summer-is-still-safe\/\">actual SPF drops<\/a><\/strong>, without any visible signs of deterioration. <\/p>\n<p>However, the phrase \u201cbest used by\u201d applies only to unopened tubes. As long as this best-by date has not passed, an <a href=\"https:\/\/www.parisselectbook.com\/en\/2026\/06\/23\/i-tried-this-e18-korean-sunscreen-that-went-viral-on-tiktok-it-replaced-my-day-cream-all-summer-long\/\">unopened tube of sunscreen<\/a> remains usable in principle. <\/p>\n<h3>What the UFC-Que Choisir study says about actual lifespan<\/h3>\n<p>To investigate this further, UFC-Que Choisir conducted a <strong>14-month<\/strong> study of <strong>eight sunscreens<\/strong>. The products were subjected to alternating cycles of cold, intense heat, and artificial UV radiation. At the end of the study, <strong>six of the eight products<\/strong> remained stable.  <\/p>\n<blockquote><p>\u201cSo you can use a sunscreen that still looks normal a year later. However, using it for three summers in a row would probably be excessive. &#8221; \u2014 UFC-Que Choisir<\/p><\/blockquote>\n<p>These reassuring results do, however, have a significant limitation. Organic sunscreens with mineral filters were not included in the study, which means we should remain vigilant when it comes to these formulas. <\/p>\n<h2>The exception that calls for the greatest caution when it comes to sunscreen<\/h2>\n<p>Some sunscreen products contain<strong>octocrylene<\/strong>, a chemical UV filter found in many traditional formulas. This filter poses a particular problem over time. <\/p>\n<p>According to <strong>Laurence Coiffard<\/strong>, a professor and researcher in cosmetic formulation at the University of Nantes, this filter \u201cbecomes carcinogenic when it breaks down over the long term.\u201d Furthermore, she points out that \u201cthis degradation is completely invisible, and consumers have no way of knowing it\u2019s happening.\u201d <\/p>\n<p>Therefore, for products containing octocrylene, checking the use-by date is not enough. It is best to replace the tube every season, without exception. <\/p>\n<h3>Visual and olfactory signs that indicate a product has gone bad<\/h3>\n<p>Beyond the expiration dates, the appearance of the product itself provides valuable clues. A safe sunscreen has a uniform texture, with no separation between its components. If oil separates from the cream, or if lumps appear, the product has gone bad.  <\/p>\n<p>Smell is also a reliable indicator. UFC-Que Choisir is clear on this point: \u201cIf the product smells rancid or has any other suspicious odor: throw it away!\u201d There\u2019s no point in trying to test it on your skin in this case. <\/p>\n<ul>\n<li>Check the <strong>Shelf Life After Opening (SLAO)<\/strong>: \u201c12M\u201d means 12 months after opening.<\/li>\n<li>Check the <strong>best-by date<\/strong> on unopened tubes.<\/li>\n<li>Check the texture: If a cream has separated or has lumps, throw it away.<\/li>\n<li>Smell the product: A rancid or suspicious odor indicates spoilage.<\/li>\n<li>Look for any changes in color: unusual <strong>yellowing or browning<\/strong> indicates chemical degradation of the filters.<\/li>\n<\/ul>\n<h2>When a product&#8217;s color becomes a warning sign<\/h2>\n<p>Another visual indicator deserves attention: color. Unusual yellowing or browning\u2014especially in white formulations\u2014indicates chemical degradation of the UV filters. This change may seem minor, but it signals actual degradation.  <\/p>\n<p>In this case, sun protection becomes unpredictable. The skin may then be exposed to much more UVA and UVB radiation than expected, without you realizing it at the time. However, the WHO emphasizes that repeated sunburns significantly increase the risk of melanoma.  <\/p>\n<p>Therefore, even a tube that looks normal deserves a close inspection before being put back into service. Date, texture, smell, and color are the four key factors to check before each summer season. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Every time summer begins, the same doubt creeps up from the bottom of my beach bag: that tube of sunscreen I found left over from&#8230;<\/p>\n","protected":false},"author":13,"featured_media":230229,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2685],"tags":[7652],"quartier":[],"class_list":["post-230644","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-du-luxe-en","tag-sun-cream"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>&quot;12M symbol&quot;: This mark on the tube indicates whether your sunscreen from last summer is still usable<\/title>\n<meta name=\"description\" content=\"Is last summer&#039;s sunscreen still in your bag? 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