Nitric Oxide Explained: The Natural Way To Improve Endurance & Recovery

Looking for a safe, natural way to support blood flow, energy and recovery? Nitric oxide (NO) is one of the most studied molecules in sports nutrition. From marathon runners to everyday trainers, athletes are learning how to support their body's own nitric oxide production to improve oxygen delivery, boost energy efficiency and speed up recovery, without relying on caffeine or other stimulants.

Table Of Contents

• What Is Nitric Oxide & Why It Matters For Performance

• The Two Pathways: How The Body Produces Nitric Oxide

• Who Benefits Most From Nitric Oxide Support?

• How To Support Nitric Oxide 

• Key Takeaways

What Is Nitric Oxide & Why It Matters For Performance

Nitric oxide is a molecule your body makes in the lining of your blood vessels. It helps those vessels relax and widen, this is called vasodilation which means more blood, oxygen and nutrients can get to your working muscles. Higher nitric oxide levels are linked to better exercise efficiency, needing less oxygen for the same effort, and quicker recovery between hard efforts¹˒².

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Your body makes nitric oxide two ways: from the amino acid L-arginine, or from nitrates in food (like beetroot). Both end up doing the same job, widening blood vessels, helping your muscles use oxygen more efficiently, and reducing how hard your body has to work at a given effort²˒⁴.

The Two Pathways: How The Body Produces Nitric Oxide

There are two main ways to support nitric oxide production. The first is through dietary nitrate, found in vegetables like beetroot, spinach and rocket, which is converted into nitrite and then nitric oxide in the body. The second is by supporting the enzyme system that produces nitric oxide directly from L-arginine, known as eNOS. Certain plant compounds, such as procyanidins found in maritime pine bark extract, have been shown to help activate this pathway. Some sports supplements, including Plasmaide and Modex, are built around this second pathway rather than dietary nitrate²˒⁴.

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The food-based route (from nitrates, like beetroot) works fast, it relies on bacteria in your mouth to convert it, giving a quick boost to nitric oxide within a few hours of eating it. The body's own production route works more gradually, and depends on things like inflammation levels and overall vessel health, so it builds up over time with regular, consistent intake rather than from a single dose⁴˒⁵.

Who Benefits Most From Nitric Oxide Support?

Endurance athletes and moderately trained individuals tend to see the most noticeable benefits from supporting nitric oxide, including improved endurance, time to exhaustion and energy efficiency during sustained submaximal exercise. Highly trained athletes may see smaller gains, since their oxygen delivery and vascular function are often already well developed¹˒⁶.

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Pine bark extract has been studied for its potential role in vascular and muscular function during exercise, including effects on perceived exertion, heart rate and lactate handling⁶, as well as muscular endurance in cyclists⁷. The evidence so far is promising but limited in scale. 

How To Support Nitric Oxide

For an acute pre-exercise boost, concentrated beetroot juice is well studied and effective. For everyday vascular support and recovery, some athletes use a daily nitric oxide-support supplement instead, taken consistently rather than as a single dose. Products like Plasmaide's Advanced Endurance + Recovery sachets are one example of this approach, using maritime pine bark extract and typically taken 30-60 minutes before and/or after training, or morning and night for general wellbeing. Whichever route you choose, consistency matters more than a single big dose³˒⁴.

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Nitric oxide has a short half-life of only seconds to minutes in the bloodstream, so repeated, regular intake helps maintain elevated vascular NO signalling over time. This is why eNOS-supporting ingredients are typically studied over several weeks, whereas nitrate-loading protocols are usually assessed over days⁴˒⁷.

Key Takeaways

• Two pathways → Dietary nitrate (e.g. beetroot) drives an acute rise in nitric oxide; ingredients like pine bark extract support the body's own eNOS enzyme system over time

• Timing → Nitrate-based options peak within hours; eNOS-support ingredients build gradually with regular use

• Best for → Endurance events, submaximal exercise, key workouts and everyday recovery

• Who benefits most → Moderately trained or endurance athletes; highly trained athletes may see smaller gains

• Form → Choose based on preference and use case: concentrated shots for race-day nitrate loading, or a daily formula for ongoing support

• Mechanism → Both pathways increase nitric oxide, improving blood flow, energy production and oxygen delivery to muscles

Ash Miller
Dietitian and Nutritionist (Masters)
Bachelor of Physical and Health Education
Instagram: @ashthomo_nutrition

References

1. Senefeld JW, Wiggins CC, Regimbal RJ, et al. Ergogenic effect of nitrate supplementation: meta-analysis. Med Sci Sports Exerc. 2020.

2. Weichmann F, Rohdewald P. Pycnogenol® French maritime pine bark extract in randomized, double-blind, placebo-controlled human clinical studies. Front Nutr. 2024;11:1389374. doi:10.3389/fnut.2024.1389374

3. Maimoona A, Naeem I, Saddiqe Z, Jameel K. A review on biological, nutraceutical and clinical aspects of French maritime pine bark extract. J Ethnopharmacol. 2011;133(2):261-277.

4. Suzuki N, et al. Antihypertensive effect of French maritime pine bark extract (Flavangenol): possible involvement of endothelial nitric oxide-dependent vasorelaxation. J Hypertens. 2009;27(1):92-101.

5. Grimm T, et al. Facilitated cellular uptake and suppression of inducible nitric oxide synthase by a metabolite of maritime pine bark extract (Pycnogenol). Free Radic Biol Med. 2012.

6. Vinciguerra G, Belcaro G, et al. Evaluation of the effects of supplementation with Pycnogenol® on fitness in normal subjects with the Army Physical Fitness Test and in performances of athletes in the 100-minute triathlon. J Sports Med Phys Fitness. 2013.

7. Igawa T, Hara T, Ishizaka M, Sawaya Y, Ito A, Yakabi A, Kubo A. Changes in muscle strength and endurance of professional cyclists due to PycnoRacer™. J Phys Ther Sci. 2021;33(4):339-344.

Disclaimer: 
The content in this blog is for general information only and is not a substitute for professional medical advice, diagnosis, or treatment. Always speak with your doctor or allied health team before changing your diet, exercise, or taking supplements, especially if you have a health condition or take medication. Please use this information as a guide only. Aid Station doesn't take responsibility for individual outcomes.

Studies 5-7 relate to maritime pine bark extract as an ingredient, mostly under other branded formulations (Pycnogenol®, Flavangenol®, PycnoRacer®). No independent clinical trials on the Plasmaide product itself were identified; the science cited relates to its key active ingredient, not the finished product.