{"id":5933,"date":"2025-12-15T13:40:18","date_gmt":"2025-12-15T13:40:18","guid":{"rendered":"https:\/\/www.lifepronutrition.com\/blog\/general\/10-frequently-asked-questions-about-fructose-supplementation\/"},"modified":"2026-09-16T05:39:02","modified_gmt":"2026-09-16T05:39:02","slug":"10-frequently-asked-questions-about-fructose-supplementation","status":"publish","type":"post","link":"https:\/\/www.lifepronutrition.com\/blog\/en\/endurance-en\/10-frequently-asked-questions-about-fructose-supplementation\/","title":{"rendered":"10 frequently asked questions about fructose supplementation"},"content":{"rendered":"<p>Fructose <strong>supplementation<\/strong> has become a key strategy within <strong>sports nutrition for endurance sports<\/strong> such as <strong>running, trail running or cycling<\/strong>. When used correctly, it can help you <strong>improve performance<\/strong>, delay fatigue and optimize energy replenishment during long training sessions and competitions.<\/p>\n<p>Below, we answer the <strong>10 most frequently asked questions about fructose supplementation in endurance sports<\/strong>.<\/p>\n<h2>1. What is fructose and why is it used in endurance sports?<\/h2>\n<p><strong>Fructose<\/strong> is a simple carbohydrate that is absorbed in the intestine through a different transporter than glucose.<br \/>\nThis makes it possible to <strong>increase the total amount of carbohydrates absorbed per hour<\/strong>, which is key in long-duration events such as marathons, ultras or cycling stages.<\/p>\n<p>Naturally, the main sources of fructose are fruits (apples, pears, mangoes, grapes, etc.), dates, honey, nectars and plant saps, as well as vegetables, although in smaller proportions.<\/p>\n<h2>2. Why is it recommended to combine fructose with other carbohydrates?<\/h2>\n<p>Combining <strong>fructose with glucose or maltodextrin<\/strong> makes it possible to use <strong>multiple intestinal transporters<\/strong>, which improves absorption and reduces the risk of gastrointestinal discomfort.<\/p>\n<p>Our intestine uses <strong>specific transporters<\/strong> to absorb each type of carbohydrate:<\/p>\n<ul>\n<li><strong>Glucose and maltodextrin<\/strong> are absorbed through the <strong>SGLT1<\/strong> transporter<\/li>\n<li><strong>Fructose<\/strong> is absorbed through the <strong>GLUT5<\/strong> transporter<\/li>\n<\/ul>\n<p>When only one type of carbohydrate is consumed (for example, glucose alone), the corresponding transporter may become <strong>saturated<\/strong>, limiting the amount of energy the body is able to absorb per hour.<\/p>\n<p>By <strong>combining fructose with glucose or maltodextrin<\/strong>, <strong>multiple intestinal transporters are activated simultaneously<\/strong>, allowing you to:<\/p>\n<ul>\n<li>Increase total carbohydrate absorption per hour.<\/li>\n<li>Maintain more stable energy levels.<\/li>\n<li>Reduce the risk of unabsorbed carbohydrates causing digestive problems.<\/li>\n<\/ul>\n<h2>3. What is the most commonly used fructose-to-glucose ratio?<\/h2>\n<p>The ratios most commonly used in running and cycling are:<\/p>\n<ul>\n<li><strong>2:1 ratio (glucose : fructose) At Life Pro, with this ratio you can find Energy Gel with and without caffeine<\/strong><\/li>\n<li><strong>1:0.8 ratio<\/strong>. At Life Pro, you can find <strong>Ultra Gel.<\/strong><\/li>\n<\/ul>\n<p>These combinations make it possible to reach intakes of <strong>60 to 90 g of carbohydrates per hour<\/strong>, and even more in advanced athletes.<\/p>\n<h2>4. In what formats can fructose be supplemented?<\/h2>\n<p>Fructose can be consumed in different formats:<\/p>\n<ul>\n<li>Energy gels<\/li>\n<li>Isotonic or hypotonic drinks<\/li>\n<li>Carbohydrate powders<\/li>\n<li>Energy bars<\/li>\n<\/ul>\n<p>Each format has advantages depending on the <strong>duration of the effort<\/strong>, <strong>intensity<\/strong> and <strong>digestive tolerance<\/strong>.<\/p>\n<figure id=\"attachment_5566\" aria-describedby=\"caption-attachment-5566\" style=\"width: 1230px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5566 size-full\" src=\"https:\/\/www.lifepronutrition.com\/blog\/wp-content\/uploads\/2025\/12\/2.jpg\" alt=\"10 frequently asked questions about fructose supplementation in endurance sports\" width=\"1240\" height=\"550\" srcset=\"https:\/\/www.lifepronutrition.com\/blog\/wp-content\/uploads\/2025\/12\/2.jpg 1240w, https:\/\/www.lifepronutrition.com\/blog\/wp-content\/uploads\/2025\/12\/2-300x133.jpg 300w, https:\/\/www.lifepronutrition.com\/blog\/wp-content\/uploads\/2025\/12\/2-1024x454.jpg 1024w, https:\/\/www.lifepronutrition.com\/blog\/wp-content\/uploads\/2025\/12\/2-768x341.jpg 768w\" sizes=\"auto, (max-width: 1240px) 100vw, 1240px\" \/><figcaption id=\"caption-attachment-5566\" class=\"wp-caption-text\">10 frequently asked questions about fructose supplementation in endurance sports<\/figcaption><\/figure>\n<h2> 5. Is it better to take fructose before, during or after training?<\/h2>\n<ul>\n<li><strong>During exercise<\/strong>: this is the optimal time to maintain energy levels during the race or training session.<\/li>\n<li><strong>Before<\/strong>: during carbohydrate loading or long sessions.<\/li>\n<li><strong>After<\/strong>: combined with other carbohydrates to accelerate glycogen replenishment.<\/li>\n<\/ul>\n<h2>6. Can fructose cause digestive problems?<\/h2>\n<p>It can cause stomach discomfort if consumed in excess.<br \/>\nThat is why it is important to:<\/p>\n<ul>\n<li>Try it during training, not in competition.<\/li>\n<li>Gradually adjust the dosage.<\/li>\n<li>Combine it with glucose or maltodextrin.<\/li>\n<\/ul>\n<p>Also, in the event of fructose intolerance, fructose-free gel options are available, for example, formulated with maltodextrin and cyclodextrin.<\/p>\n<h2>7. How much fructose can be consumed per hour?<\/h2>\n<p>In general:<\/p>\n<ul>\n<li>Up to <strong>30 g of fructose per hour<\/strong><\/li>\n<li>Combined with glucose to reach <strong>60\u201390 g\/h in total<\/strong><\/li>\n<\/ul>\n<p>Trained athletes may tolerate higher amounts with proper planning.<\/p>\n<h2>8- What are the main benefits of fructose supplementation in endurance sports?<\/h2>\n<p><strong>Fructose supplementation<\/strong> provides several key benefits in endurance sports such as <strong>running and cycling<\/strong>, especially during prolonged efforts at moderate to high intensity.<\/p>\n<p>Its main benefits include:<\/p>\n<ul>\n<li><strong>Greater energy intake per hour<\/strong> when combined with other carbohydrates such as glucose or maltodextrin.<\/li>\n<li><strong>Improved intestinal absorption<\/strong>, by using different transporters, which makes it possible to consume more carbohydrates without saturating the digestive system.<\/li>\n<li><strong>Delayed fatigue<\/strong>, thanks to greater energy availability and muscle glycogen savings.<\/li>\n<li><strong>Better gastrointestinal tolerance<\/strong> when used as part of a multiple-carbohydrate strategy.<\/li>\n<li><strong>More stable performance<\/strong> in long events, helping maintain pace for longer.<\/li>\n<\/ul>\n<p>For this reason, fructose has become a key element within <strong>modern endurance sports nutrition strategies.<\/strong><\/p>\n<h2>9. What other supplements can fructose be combined with to improve performance?<\/h2>\n<p>Fructose can be combined with different supplements to <strong>enhance its ergogenic effect<\/strong>, provided that the strategy is well planned:<\/p>\n<ul>\n<li><strong>Glucose or maltodextrin<\/strong>: an essential combination to maximize carbohydrate absorption and performance.<\/li>\n<li><strong>Caffeine<\/strong>: improves perceived exertion, concentration and performance, especially during the final stages of competition.<\/li>\n<li><strong>Mineral salts and electrolytes<\/strong>: essential for maintaining hydration and preventing cramps.<\/li>\n<li><strong>Amino acids or BCAA<\/strong>: may help reduce muscle damage during prolonged efforts.<\/li>\n<li><strong>Beta-alanine<\/strong>: useful in endurance sports involving changes of pace or high-intensity efforts, although its effect is not immediate and requires prior loading.<\/li>\n<\/ul>\n<p>The key is to <strong>adapt the combination to the type of event, duration, intensity and individual tolerance<\/strong>.<\/p>\n<h2>10- Can fructose be used during fasted training or when carbohydrate availability is low?<\/h2>\n<p>Yes, <strong>fructose can be used during fasted training or when carbohydrate availability is low<\/strong>, as long as it is done <strong>strategically<\/strong> and with a clear objective within the nutritional plan.<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-center kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;center&quot;,&quot;id&quot;:&quot;5933&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Valora el articulo&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votos)&quot;,&quot;size&quot;:&quot;22&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 17.6px;\">\n            <span class=\"kksr-muted\">Valora el articulo<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Fructose supplementation has become a key strategy within sports nutrition for endurance sports such as running, trail running or cycling. When used correctly, it can help you improve performance, delay fatigue and optimize energy replenishment &#8230; <a title=\"10 frequently asked questions about fructose supplementation\" class=\"read-more\" href=\"https:\/\/www.lifepronutrition.com\/blog\/en\/endurance-en\/10-frequently-asked-questions-about-fructose-supplementation\/\" aria-label=\"M\u00e1s en 10 frequently asked questions about fructose supplementation\">Leer m\u00e1s<\/a><\/p>\n","protected":false},"author":3,"featured_media":5565,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wprm-recipe-roundup-name":"","wprm-recipe-roundup-description":"","footnotes":""},"categories":[642],"tags":[],"ppma_author":[683],"class_list":["post-5933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-endurance-en","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>10 frequently asked questions about fructose supplementation - Blog Life Pro Nutrition<\/title>\n<meta name=\"description\" content=\"All the information about fructose you were looking for \u2714\ufe0f 10 frequently asked questions about fructose supplementation\" \/>\n<meta name=\"robots\" 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