{"id":127041,"date":"2026-07-24T15:03:53","date_gmt":"2026-07-24T21:03:53","guid":{"rendered":"https:\/\/purmabiologics.com\/blog\/what-is-dmem-f12\/"},"modified":"2026-08-26T18:42:54","modified_gmt":"2026-08-27T00:42:54","slug":"what-is-dmem-f12","status":"publish","type":"post","link":"https:\/\/purmabiologics.com\/blog\/what-is-dmem-f12\/","title":{"rendered":"What Is DMEM\/F-12? The DMEM and Ham&#8217;s F-12 Blend Explained"},"content":{"rendered":"<div class=\"purma-guide\">\n<p class=\"pg-lead\">DMEM\/F-12 is one of the most popular cell culture media in use today. It is a 1:1 blend of DMEM and Ham&#8217;s F-12 that combines the richness of DMEM with the wide range of components in F-12, making it a versatile choice for many cell types and for reduced-serum work. This guide explains what DMEM\/F-12 is, why it is so widely used, which cells it suits, and how to use it.<\/p>\n<div class=\"pg-keyfacts\">\n<h3>Key Facts<\/h3>\n<ul>\n<li><strong>Type:<\/strong> 1:1 blend of DMEM and Ham&#8217;s F-12<\/li>\n<li><strong>Best for:<\/strong> Broad cell types; reduced-serum and serum-free work<\/li>\n<li><strong>Glucose:<\/strong> Intermediate (between DMEM and F-12)<\/li>\n<li><strong>Buffering:<\/strong> Bicarbonate (use a CO2 incubator)<\/li>\n<\/ul>\n<\/div>\n<h2>What is DMEM\/F-12?<\/h2>\n<p>DMEM\/F-12 is a basal medium made by mixing equal parts of two well-established media: <a href=\"\/what-is-dmem\/\">DMEM<\/a>, a rich, high-nutrient medium, and <a href=\"\/what-is-hams-f-12k\/\">Ham&#8217;s F-12<\/a>, which contains a broader set of components including trace elements and other additions. The blend brings together DMEM&#8217;s high concentrations of amino acids and glucose with F-12&#8217;s wider variety of ingredients, giving a balanced, well-rounded medium.<\/p>\n<h2>Why is DMEM\/F-12 so popular?<\/h2>\n<p>The combination is more than the sum of its parts. DMEM supplies high levels of key nutrients, while F-12 adds a richer range of components at lower concentrations. Together they create an environment that supports a wide variety of cells and works especially well when you want to reduce or remove serum. That flexibility is why DMEM\/F-12 is a default choice in so many protocols. For a direct comparison with plain DMEM, see our guide on <a href=\"\/dmem-vs-dmem-f12\/\">DMEM vs DMEM\/F-12<\/a>.<\/p>\n<h2>What is DMEM\/F-12 used for?<\/h2>\n<p>DMEM\/F-12 suits a broad set of cell types, including:<\/p>\n<ul>\n<li><strong>Many primary cells<\/strong> and established cell lines<\/li>\n<li><strong>Reduced-serum and serum-free culture<\/strong>, often as a base with defined supplements<\/li>\n<li><strong>Stem cells and specialized cultures<\/strong> that benefit from a rich, balanced formulation<\/li>\n<\/ul>\n<h2>What is in DMEM\/F-12?<\/h2>\n<p>Because it is a 1:1 blend, DMEM\/F-12 contains the salts, amino acids, vitamins, and glucose of both parent media, giving an intermediate glucose level and a broad nutrient profile that includes F-12&#8217;s trace elements. It uses a bicarbonate buffer with phenol red, so it needs a CO2 incubator (usually 5%) to hold the correct pH. HEPES-buffered versions are available for work outside the incubator.<\/p>\n<h2>How to supplement and use DMEM\/F-12<\/h2>\n<p>Before use, DMEM\/F-12 is completed with serum (commonly 5 to 10% FBS) or defined supplements, plus L-glutamine or a stable glutamine dipeptide. Keep it in a CO2 incubator, store it refrigerated and protected from light, warm it gently before use, and keep the same lot across an experiment for consistency. Its balanced formulation makes it a strong starting point when moving toward reduced-serum culture.<\/p>\n<p>DMEM\/F-12 is widely used with HEK293 cells for recombinant protein expression. For the downstream step, see our guide to <a href=\"\/his-tag-protein-purification\/\">His-tag protein purification<\/a>.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<p><strong>What is the ratio in DMEM\/F-12?<\/strong><br \/>\nDMEM\/F-12 is a 1:1 blend, made by mixing equal parts DMEM and Ham&#039;s F-12. This gives an intermediate glucose level and a broad nutrient profile that includes the trace elements contributed by F-12.<\/p>\n<p><strong>Why use DMEM\/F-12 instead of plain DMEM?<\/strong><br \/>\nDMEM supplies high levels of key nutrients, while F-12 adds a wider range of components at lower concentrations, including trace elements. Together they create a richer environment that suits demanding cell types and reduced-serum or serum-free work.<\/p>\n<p><strong>Is DMEM\/F-12 good for serum-free culture?<\/strong><br \/>\nYes. DMEM\/F-12 is commonly used as a base for reduced-serum and serum-free culture, paired with defined supplements in place of some or all of the serum.<\/p>\n<p><strong>How much serum does DMEM\/F-12 need?<\/strong><br \/>\nIt is typically completed with 5 to 10% fetal bovine serum, or with defined supplements for serum-free work, plus L-glutamine or a stable glutamine dipeptide. Because it is bicarbonate buffered, keep it in a CO2 incubator.<\/p>\n<\/div>\n<div class=\"purma-related\">\n<p class=\"pr-h\">Related guides<\/p>\n<ul class=\"pr-list\">\n<li><a href=\"\/what-is-dmem\/\">What Is DMEM?<\/a><\/li>\n<li><a href=\"\/what-is-emem\/\">What Is EMEM?<\/a><\/li>\n<li><a href=\"\/what-is-rpmi-1640\/\">What Is RPMI 1640?<\/a><\/li>\n<\/ul>\n<p class=\"pr-all\">Browse every guide in the <a href=\"\/cell-culture-guides\/\">Cell Culture Guides library<\/a>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>DMEM\/F-12 is one of the most popular cell culture media in use today. It is a 1:1 blend of DMEM and Ham&#8217;s F-12 that combines the richness of DMEM with the wide range of components in F-12, making it a versatile choice for many cell types and for reduced-serum work. This guide explains what DMEM\/F-12 [&hellip;]<\/p>\n","protected":false},"author":3155,"featured_media":127123,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[856],"tags":[],"class_list":["post-127041","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","entry","has-media","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails","has-product-nav"],"acf":[],"_links":{"self":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/posts\/127041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/users\/3155"}],"replies":[{"embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/comments?post=127041"}],"version-history":[{"count":0,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/posts\/127041\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/media\/127123"}],"wp:attachment":[{"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/media?parent=127041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/categories?post=127041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/purmabiologics.com\/blog\/wp-json\/wp\/v2\/tags?post=127041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}