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Welcome Offer! Standard priced items enjoy 5% OFF! Use code :【 WELCOME
* New member exclusive

Welcome Offer! Standard priced items enjoy 5% OFF! Use code :【 WELCOME
* New member exclusive

Welcome Offer! Standard priced items enjoy 5% OFF! Use code :【 WELCOME
* New member exclusive
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BEST RUNNING SUPPLEMENTS FOR MARATHON TRAINING ACCORDING TO A SPORTS DIETITIAN

GNCJun 16, 2025 • 3 min read

You’re an over achiever at heart, and Living Well won’t stop at the finish line. GNC is here to help every step of the way – we’ve been fueling runners since 1935!

This round up of the best endurance supplements for marathon runners is near and dear to my heart. I’m in the thick of it! With just a few more weeks until my fifth 26.2-mile journey, I’m sharing what I’ve been using as part of my training routine. It’s been a good fifteen years since I toed the starting line of a marathon – for kids, careers, and a pandemic. But I’m here! And it’s good to be back.

As a Sports Dietitian and endurance enthusiast these are my top picks, to fuel your road to race day – and beyond.

BEST RUNNING SUPPLEMENTS FOR MARATHON TRAINING

MULTIVITAMINS & FISH OIL

Add Foundational Supplements to Boost Your Diet

GNC WOMEN’S ULTRA MEGA ENERGY & METABOLISM MULTIVITAMIN

Runners have higher energy demands, requiring more nutrients for exercise, recovery, and wellness. And while eating more sounds like a good problem to have, we want those calories to be coming from foods that will benefit your health for optimal performance and recovery. And let’s face it – no one’s diet is perfect! You’ve already got 100% Pro Performance Whey Protein in your corner. Time to add a multi!  

Multivitamins provide daily nutritional assurance, to help fill nutrient gaps. GNC’s Energy & Metabolism Multivitamins are formulated for both Men & Women. With a Super Antioxidant Blend to support exercise recovery & boost immune health. And additional ingredients to support your active lifestyle, keeping you focused on achieving your goals. Plus, they’re both clinically proven to help you feel better – and let’s face it, feeling better these days is what keeps you going! 

One thing I’ve realized about myself as I started dipping my toes back into the marathon scene – it is a HUGE commitment. And it takes A LOT of time out of my week that I would normally use to meal prep. And with a full-time job, two kids, and a new puppy… my diet is less then what I strive for. So, the Women’s Multivitamin has really come in handy! 

GNC TRIPLE STRENGTH FISH OIL

You know eating fish is good for your health, but man it’s tough getting 4-6 meals of fatty fish each week! It’s expensive, requires planning, and fish may not be your thing. It’s no wonder 90% of American’s aren’t consuming enough Omega-3s through diet alone. What’s the big deal about fish oil anyway?  

Fish oil contains Omega-3 fatty acids, which are essential for whole body health and support your heart, brain, skin, eyes, and joints! And our joints are oh so important these days! GNC Triple Strength Fish Oil is 300% more potent than regular fish oil. Adding it to your foundational routine supports the body’s natural anti-inflammatory process, enhancing recovery and joint health after training. All the benefits of eating fish, without the hassle. 

I love salmon – but with all the running around I have very little time to meal prep and cook it. And while I could eat sushi pretty much every day of week – I can’t afford to. So I rely on fish oil to get my omega’s. My joints are thankful! 

GNC
Author: GNC

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