Nitric Oxide Supplements Australia: An Honest Guide for Endurance Athletes (2026)

TL;DR for athletes who just want the answer

Why nitric oxide matters (in one paragraph)

Nitric oxide (NO) is a signalling molecule that tells your blood vessels to dilate. Wider vessels mean more oxygen and nutrients reach your muscles, less metabolic waste sits around, and your perceived effort drops at any given pace. For Australian endurance athletes — runners chasing a Gold Coast Marathon PB, triathletes prepping for Ironman Cairns, cyclists grinding through summer training — that’s a measurable performance edge. Research shows beetroot juice supplementation can reduce the oxygen cost of submaximal exercise by around 3% in trained athletes.¹²

But here’s the part most blogs skip: nitric oxide doesn’t fuel your muscles. It improves delivery. If you don’t have stable energy in the system, all the vasodilation in the world won’t stop you bonking at 32km. That’s why this guide covers both halves: how to boost NO, and how to keep your fuel steady so the boost actually pays off.

The two pathways (and why this matters for what you buy)

There are two real ways to raise nitric oxide. Most products on shelves use one of them. Some try to be both and end up doing neither well.

Pathway 1: Nitrate → Nitrite → NO (the beetroot route)

You eat dietary nitrates (concentrated beetroot juice, leafy greens). Bacteria on the back of your tongue convert nitrate to nitrite. Stomach acid converts nitrite to NO, which enters the bloodstream.³ Slow build-up, sustained effect — best for long endurance events.

Pathway 2: L-arginine / L-citrulline → NO (the amino acid route)

L-citrulline converts to L-arginine in your kidneys, which the enzyme eNOS turns directly into NO inside your blood vessels. Faster onset, stronger acute effect — best for high-intensity sessions, intervals, criteriums, time trials.⁴

Why not just take L-arginine directly? Your gut and liver break it down before it can do its job. L-citrulline bypasses that and produces higher, more sustained arginine levels in the blood. This is settled science.

Beetroot juice: how to actually use it for an Australian A-race

The mistake I see constantly: athletes buy a beetroot shot the day before a race, smash it 2 hours before the start, and expect magic. That’s not how this works.

The protocol that’s backed by research:

• 7 days out: Start one concentrated beetroot shot per day (70–140 ml depending on brand concentration). Stack it with breakfast so you don’t forget.
• Race morning: Final shot 2–3 hours before the gun, alongside your normal pre-race breakfast.
• The reason: You’re saturating your body’s nitrate pool so NO production is primed when you need it. A single dose moves the needle a little. Seven days of loading moves it meaningfully.

This loading phase fits inside any standard race-week plan. It doesn’t replace carb loading. It doesn’t replace your race-morning fuelling. It runs alongside both.

What about race-morning fuelling?

This is where the post pivots, because beetroot is a delivery upgrade — not a fuel. On race morning you still need carbohydrate energy that’s going to last. Sugar-based gels and drinks spike your blood glucose, then crash it 30–45 minutes later, which is exactly when most marathoners hit the wall.

UCAN Energy Powder and UCAN Energy + Protein use LIVSTEADY™ — a slow-release carbohydrate originally developed as a medical food for kids with hypoglycaemia. It delivers high-quality energy without the spike and crash. Take it 30 minutes before your race, alongside your beetroot shot, and you’ve got both halves of the equation: dilated vessels carrying steady fuel.

Hydration matters more during a loading week

Seven days of consistent endurance training plus a daily concentrated nitrate dose pulls hard on your fluid and electrolyte balance. UCAN Hydrate is a sugar-free electrolyte drink that’s purpose-built for this — sodium, potassium, magnesium, zero added sugar, no jittery stimulants. A bottle on every long run during your loading phase keeps the rest of your system functioning while the nitrates do their work.

L-citrulline: the high-intensity tool

If beetroot is your endurance base layer, L-citrulline is your sharp end. It comes into its own when the session is short, hard, and demands repeat efforts: 5–10 km races, track repeats, criteriums, threshold blocks, hilly time trials.

The protocol:

• 60–90 minutes before warm-up: Mix 6–8 g of L-citrulline malate with water and drink.
• 30 minutes before: Take your fuel. This is where a UCAN Edge gel earns its place — 75 minutes of steady carbohydrate energy with no sugar, no caffeine crash, and no GI distress mid-session.

A 2016 trial in trained cyclists showed 2.4 g/day of L-citrulline for 7 days improved 4 km time-trial performance, and acute doses of 6–8 g around an hour pre-session are well-supported in the literature.⁴⁵

Why we suggest stacking L-citrulline with UCAN Edge

Two different jobs, complementary biochemistry:

• L-citrulline opens the blood vessels and clears ammonia (a fatigue driver).
• UCAN Edge keeps your blood glucose stable so your central nervous system stays sharp through the hard reps.

Sugar-based gels with a high-intensity NO booster is a bad combination — you’ll get the NO boost, then crash off the sugar 20 minutes in. LIVSTEADY-based fuel doesn’t do that. That’s the whole point of the product.

The mistake that wipes out everything: antiseptic mouthwash

Remember pathway 1? It depends on bacteria on the back of your tongue converting nitrate to nitrite. Antiseptic mouthwash — anything with chlorhexidine or alcohol — kills those bacteria indiscriminately. You can spend $40 on a week of beetroot shots and wipe the entire effect out with one swish.⁶

Multiple studies have shown chronic mouthwash use is associated not just with nullified NO production in athletes, but with elevated blood pressure in the general population.⁷ The action is simple:

• Drop antiseptic mouthwash for the 5–7 days of your loading phase.
• Check labels — alcohol and chlorhexidine are the two killers.
• If you can’t go without, switch to an alcohol-free product.

How to build your nitric oxide plan: two scenarios

Scenario 1: Marathon, half-Ironman, or long-distance event

Scenario 2: High-intensity session (intervals, crit, time trial)

Coach’s rule, no exceptions: Never trial a new supplement on race day. Test the full protocol — beetroot, mouthwash swap, fuel timing — during your hardest training week first.

What we sell, what we don’t, and why we wrote this

We’re the official Australian reseller of UCAN. We don’t sell beetroot or L-citrulline. UCAN doesn’t make those products and we don’t onsell other brands. So if you came here looking for an Australian source of beetroot powder, this isn’t it — you’ll find good options at most supplement retailers.

What we do sell is the steady-energy half of the equation. Most athletes treat fuel as an afterthought to the supplement they’re excited about (NO boosters, beta-alanine, creatine, whatever’s trending). That’s backwards. Your fuel is the foundation. Everything else stacks on top.

Frequently Asked Questions

Can I just eat beetroot and skip the shots?

Theoretically, yes. Practically, you’d need 300–600 mg of nitrates daily — that’s a lot of beetroot, rocket, or spinach, and the volume causes most athletes GI problems. Concentrated shots exist for a reason.

Are there side effects?

Beeturia (pink urine and stools) is the most common — it’s harmless. L-citrulline above 8–10 g may cause minor stomach upset in some people. Trial in training, never on race day.

Can I take beetroot and L-citrulline together?

Yes. They use different biological pathways and don’t interfere with each other. A common A-race protocol: load beetroot for the week, take L-citrulline 60 minutes before the gun for an extra boost.

How quickly will I feel the effect?

L-citrulline acts in 60–90 minutes. Beetroot is a 5–7 day build-up — you won’t feel a single dose meaningfully.

Does UCAN contain nitric oxide boosters?

No. UCAN is a steady-release carbohydrate fuel based on LIVSTEADY™. It’s designed to keep blood glucose stable and prevent the spike-and-crash cycle from sugar-based gels. It works alongside NO supplements — not instead of them.

Will this help me on shorter races (parkrun, 5 km)?

L-citrulline can help. Beetroot loading is overkill for anything under 60 minutes — the loading effort isn’t worth the marginal gain.

Ready to lock in the fuel half of the equation?

Beetroot and L-citrulline boost the delivery system. Your engine still needs petrol that doesn’t crash on you mid-session. That’s where UCAN comes in.

References

1. Jones, A. M. (2014). Dietary nitrate supplementation and exercise performance. Sports Medicine, 44(Suppl 1), 35–45.
2. Domínguez, R., et al. (2017). Effects of beetroot juice supplementation on cardiorespiratory endurance in athletes: a systematic review. Nutrients, 9(1), 43.
3. Lundberg, J. O., Weitzberg, E., & Gladwin, M. T. (2008). The nitrate–nitrite–nitric oxide pathway in physiology and therapeutics. Nature Reviews Drug Discovery, 7(2), 156–167.
4. Suzuki, T., et al. (2016). Oral L-citrulline supplementation enhances cycling time-trial performance in healthy trained men. Journal of the International Society of Sports Nutrition, 13(1).
5. Bailey, S. J., et al. (2015). L-citrulline supplementation improves O₂ uptake kinetics and high-intensity exercise performance in humans. Journal of Applied Physiology, 119(4), 385–395.
6. Burleigh, M., et al. (2018). The oral microbiome, nitric oxide and exercise performance. Nitric Oxide, 80, 50–58.
7. Joshipura, K. J., et al. (2017). Over-the-counter mouthwash use and risk of pre-diabetes/diabetes. Nitric Oxide, 71, 14–20.