{"id":733751,"date":"2026-06-09T09:44:18","date_gmt":"2026-06-09T07:44:18","guid":{"rendered":"https:\/\/fermentis.com\/?page_id=733751"},"modified":"2026-06-09T10:13:55","modified_gmt":"2026-06-09T08:13:55","slug":"safspirit-m-1-barrel-aged-whisky","status":"publish","type":"page","link":"https:\/\/fermentis.com\/en\/knowledge-center\/expert-insights\/spirits-expert-insights\/safspirit-m-1-barrel-aged-whisky\/","title":{"rendered":"Discover SafSpirit\u2122 M-1: the ideal yeast for barrel-aged whisky"},"content":{"rendered":"\n  <div class=\"banner has-hover\" id=\"banner-1093818432\">\n          <div class=\"banner-inner fill\">\n        <div class=\"banner-bg fill\" >\n                                                \n                    <\/div>\n\t\t\n        <div class=\"banner-layers container\">\n            <div class=\"fill banner-link\"><\/div>            \n   <div id=\"text-box-1305403776\" class=\"text-box banner-layer x50 md-x50 lg-x50 y50 md-y50 lg-y50 res-text\">\n                                <div class=\"text-box-content text \">\n              \n              <div class=\"text-inner text-center\">\n                  \n<h1><strong>Discover SafSpirit\u2122 M-1: the ideal yeast for barrel-aged whisky<\/strong><\/h1>\n<p><em>By Denise Jones &amp; Tom Ashton <\/em><\/p>\n              <\/div>\n           <\/div>\n                            \n<style>\n#text-box-1305403776 {\n  width: 81%;\n}\n#text-box-1305403776 .text-box-content {\n  font-size: 100%;\n}\n<\/style>\n    <\/div>\n \n        <\/div>\n      <\/div>\n\n            \n<style>\n#banner-1093818432 {\n  padding-top: 200px;\n  background-color: rgb(255,255,255);\n}\n<\/style>\n  <\/div>\n\n\n<div class=\"text-center\"><div class=\"is-divider divider clearfix\" style=\"max-width:600px;height:2px;\"><\/div><\/div>\n\n\t<section class=\"section\" id=\"section_1070062794\">\n\t\t<div class=\"section-bg fill\" >\n\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n<div class=\"row\"  id=\"row-911459142\">\n\n\t<div id=\"col-375299407\" class=\"col medium-1 small-12 large-1\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-2142799051\" class=\"col medium-10 small-12 large-10\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1939619114\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1020\" height=\"680\" src=\"https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-1024x683.avif\" class=\"attachment-large size-large not-transparent\" alt=\"\" srcset=\"https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-1024x683.avif 1024w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-800x533.avif 800w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-768x512.avif 768w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-1536x1024.avif 1536w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-2048x1365.avif 2048w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/whiskey-glasses-and-bottle-on-dark-wooden-surface-2026-03-09-23-01-55-utc-600x400.avif 600w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" data-has-transparency=\"false\" data-dominant-color=\"59473c\" style=\"--dominant-color: #59473c;\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1939619114 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1325145992\" class=\"col medium-1 small-12 large-1\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-165649974\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p>We know yeast plays a fundamental role in the production of distilled spirits. It not only influences production costs and efficiency, but also sensory characteristics. Distilling yeasts are not created equal, and different strains can have a huge impact on the final flavor profile of your spirit.<\/p>\n<p>At Fermentis, the <a href=\"https:\/\/fermentis.com\/en\/fermentation\/spirits-distilling\/active-dry-yeast-spirits\/\">SafSpirit\u2122 range<\/a> of active dry yeasts has been carefully curated to provide distillers with reliable tools to craft signature beverages that stand out from the crowd. From high-performance yeasts for challenging fermentations to world-renowned historical strains that have stood the test of time, SafSpirit\u2122 yeasts offer distillers solutions that get the job done and create bespoke sensory profiles.<\/p>\n<h2><strong><em>A Historic Strain for Scottish Whisky<\/em><\/strong><\/h2>\n<p>When it comes to Scotch and single malt whiskies,<a href=\"https:\/\/fermentis.com\/en\/product\/safspirit-m-1\/\"> SafSpirit\u2122 M-1<\/a> is the go-to yeast. The M-strain has dominated the Scottish whisky industry for decades, and for good reason. This strain produces both excellent ethanol yield, together with key higher alcohols that are ideal for cask aging. It offers strong alcohol tolerance (15% ABV) and excellent attenuation of complex sugars, making it the top choice for malt whiskies where enzyme additions are prohibited.<\/p>\n<p>In addition to its popularity in Scotland, this strain is an attractive choice for any grain-based (raw or malted) distilled beverage aged in barrels. It is gaining popularity with craft distillers producing full-flavored rums.<\/p>\n<p>\u201cThough primarily used to produce Scotch and barrel-aged whisky, SafSpirit\u2122 M-1 is a highly versatile strain,\u201d says James Wilson, Fermentis Regional Sales Manager for the UK and Ireland. \u201cYou can make a range of different spirits depending on your cut point, ranging from very light and floral, all the way through to really heavy spirits that include a lot of dark fruits, dried fruits, and spice.\u201d<\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-2072831394\">\n\n\t<div id=\"col-1321585578\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<h2><strong><em>SafSpirit\u2122 M-1 Flavor Profile<\/em><\/strong><\/h2>\n<p>The \ufb01nal \ufb02avor and aroma of whisky is due to the interaction of more than 1000 \ufb02avour-active compounds known as congeners. The major congener classes identified in Scotch whisky are higher alcohols, esters, acids, phenols, lignin degradation products, and lactones.<\/p>\n<p>The yeast strain plays a crucial role in production in many of these congeners. These include:<\/p>\n<ul>\n<li><strong>Esters <\/strong>are highly volatile compounds produced by yeast as byproducts of metabolism and typically provide fruity and floral aromas. Examples include isoamyl acetate (banana), ethyl acetate (pear\/solvent), and ethyl hexanoate (apple\/aniseed).<\/li>\n<li><strong>Higher Alcohols (Fusel Alcohols) <\/strong>are produced by yeast metabolism from amino acids and sugars and often contribute warming, floral, or solvent-like notes. Key examples include isoamyl alcohol (banana\/pear and phenylethyl alcohol (rose\/perfume).<\/li>\n<li><strong>Organic\/Fatty Acids <\/strong>include lactic, acetic, butyric, and hexanoic acids, which can undergo important esterification reactions during maturation to enhance fruity and floral notes.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/fermentis.com\/en\/product\/safspirit-m-1\/\">SafSpirit\u2122 M-1<\/a> is renowned for its ability to produce a rich and complex flavor profile that is highly sought after in the world of whisky. The signature \u201cM\u201d strain congener profile respects the flavor contribution of the raw materials and is ideal for barrel-aging. The diverse array of esters produced contributes to a harmonious balance of fruity and floral notes in the final spirit and provides a depth of character that elevates the overall sensory experience.<\/p>\n<h2><strong><em>Key Takeaway for Distillers<\/em><\/strong><\/h2>\n<p><a href=\"https:\/\/fermentis.com\/en\/product\/safspirit-m-1\/\">SafSpirit\u2122 M-1<\/a> is a remarkable yeast strain that has become the gold standard for producing exceptional barrel-aged whiskies. Its ability to generate a diverse array of flavor-enhancing congeners, including esters that contribute fruity and floral notes, makes it the ideal choice whether you\u2019re looking to make a signature Scotch or a spicy barrel-aged rum. In short, it\u2019s a must-try yeast strain for distillers seeking to craft spirits with unparalleled depth and complexity.<\/p>\n\t<div id=\"gap-1428746402\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1428746402 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n<p>Curious to know how our customers are using SafSpirit\u2122 M-1? Watch our Distiller Stories featuring Kingsbarn Distillery in Scotland.<\/p>\n<div class=\"video video-fit mb\" style=\"padding-top:56.25%;\"><p><iframe loading=\"lazy\" title=\"Distiller Stories - Kingsbarn Distillery, Scotland\" width=\"1020\" height=\"574\" src=\"https:\/\/www.youtube.com\/embed\/c8G74nm0Ax4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\n\t\t\n<style>\n#section_1070062794 {\n  padding-top: 20px;\n  padding-bottom: 20px;\n}\n<\/style>\n\t<\/section>\n\t\n\n\t<section class=\"section\" id=\"section_1749364695\">\n\t\t<div class=\"section-bg fill\" >\n\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n<div class=\"row row-small\"  id=\"row-363672961\">\n\n\t<div id=\"col-1814055071\" class=\"col medium-3 small-12 large-3\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" style=\"border-radius:100%;width:60%;\">\n\t\t\t\t\t\t<div class=\"image-cover\" style=\"padding-top:100%;\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1020\" height=\"1020\" src=\"https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-1024x1024.avif\" class=\"attachment-large size-large not-transparent\" alt=\"Denise Jones\" srcset=\"https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-1024x1024.avif 1024w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-800x800.avif 800w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-450x450.avif 450w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-768x768.avif 768w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-1536x1536.avif 1536w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-300x300.avif 300w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-600x600.avif 600w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-100x100.avif 100w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/JONES-Denise-scaled-e1780646175798-400x400.avif 400w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" data-has-transparency=\"false\" data-dominant-color=\"b0a8ab\" style=\"--dominant-color: #b0a8ab;\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n<h4>Denise Jones<\/h4>\n<p>Technical Sales Support Manager for Distilling, Americas<\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1814055071 > .col-inner {\n  padding: 30px 0px 0px 0px;\n}\n<\/style>\n\t<\/div>\n\n\t\n\n\t<div id=\"col-305093765\" class=\"col medium-9 small-12 large-9\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div id=\"gap-311246635\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-311246635 {\n  padding-top: 40px;\n}\n<\/style>\n\t<\/div>\n\t\n<p><strong>Denise is our Technical Sales Support Manager &#8211; Distilling for the Americas<\/strong><\/p>\n<p>She joined Fermentis in October of 2020 and has 27 years of brewing and distilling experience, as well as serving as an international beer judge for over 20 years. Denise attended the American Brewer\u2019s Guild in the Spring of 1995 and has created award winning beers for Great Basin Brewing Company in Sparks, Nevada; Third Street Aleworks in Santa Rosa, California; and Moylan\u2019s Brewing Company in Novato, California.<\/p>\n<p>At Moylan\u2019s, she began making whiskey washes for the sister distillery, Moylan\u2019s Distilling, where she developed flavorful washes, assisted with distillations and barrel maturation decisions. In 2015 she accepted a position in Bamberg, Germany with Weyermann\u00ae Specialty Malts to become their Master Distiller\/ Staff Brew Master where she produced whiskeys,gins, beer, Schnaps and fruit brandies. Denise now lives and works out of the USA.<\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row row-small\"  id=\"row-268639486\">\n\n\t<div id=\"col-1191906040\" class=\"col medium-3 small-12 large-3\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" style=\"border-radius:100%;width:60%;\">\n\t\t\t\t\t\t<div class=\"image-cover\" style=\"padding-top:100%;\">\n\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1020\" height=\"1020\" src=\"https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-1024x1024.avif\" class=\"attachment-large size-large not-transparent\" alt=\"\" srcset=\"https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-1024x1024.avif 1024w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-800x800.avif 800w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-450x450.avif 450w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-768x768.avif 768w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-1536x1536.avif 1536w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-300x300.avif 300w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-600x600.avif 600w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-100x100.avif 100w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888-400x400.avif 400w, https:\/\/fermentis.com\/wp-content\/uploads\/2026\/06\/IMG_4534a-scaled-e1780647535888.avif 1700w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" data-has-transparency=\"false\" data-dominant-color=\"c4b9ab\" style=\"--dominant-color: #c4b9ab;\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n<h4>Tom Ashton<\/h4>\n<p>Technical Sales Support Manager &#8211; APAC<\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1191906040 > .col-inner {\n  padding: 30px 0px 0px 0px;\n}\n<\/style>\n\t<\/div>\n\n\t\n\n\t<div id=\"col-2097897365\" class=\"col medium-9 small-12 large-9\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div id=\"gap-1926913995\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1926913995 {\n  padding-top: 40px;\n}\n<\/style>\n\t<\/div>\n\t\n<p><strong>Tom Ashton is our Technical Sales Support Manager for APAC<\/strong><\/p>\n<p><span data-olk-copy-source=\"MessageBody\">With a strong background in brewing science and practical experience across multiple sectors of beverage production, Tom works closely with breweries, distilleries, and beverage producers throughout the Asia-Pacific region to provide technical support, education, and product guidance. His role at Fermentis sees him translating global innovation into practical, flavour-focused solutions for local producers, helping them harness the potential of yeast and fermentation to create consistently exceptional beverages.<\/span><\/p>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\n\t\t\n<style>\n#section_1749364695 {\n  padding-top: 5px;\n  padding-bottom: 5px;\n  background-color: rgb(230, 230, 230);\n}\n<\/style>\n\t<\/section>\n\t\n\n\t<section class=\"section\" id=\"section_185127505\">\n\t\t<div class=\"section-bg fill\" >\n\t\t\t\t\t\t\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n<div class=\"row row-small\"  id=\"row-2131505042\">\n\n\t<div id=\"col-325506191\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\"  >\n\t\t\t\n\t\t\t\n\t<div id=\"gap-89760226\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-89760226 {\n  padding-top: 40px;\n}\n<\/style>\n\t<\/div>\n\t\n<a href=\"\/knowledge-center\/expert-insights\/\" class=\"button primary is-outline\" >\n\t\t<span>Back to expert insights<\/span>\n\t<i class=\"icon-angle-right\" aria-hidden=\"true\"><\/i><\/a>\n\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\n\t\t\n<style>\n#section_185127505 {\n  padding-top: 5px;\n  padding-bottom: 5px;\n  background-color: rgb(255, 255, 255);\n}\n<\/style>\n\t<\/section>\n\t\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":21,"featured_media":734145,"parent":31531,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-blank.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-733751","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Discover 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