Answer: Beetroot nitrate has reasonably good evidence for a small improvement in endurance, mainly in recreational athletes, at doses equal to a glass of beet juice. L-arginine evidence is mixed because much of it is broken down before it reaches the blood. Both act through nitric oxide and both can interact with nitrates, ED medicines and blood pressure tablets.
- Nitric oxide relaxes artery walls so more blood reaches muscle.
- Beetroot nitrate: modest, repeatable endurance benefit at 300 to 600 mg nitrate.
- L-arginine: mixed results; studies use 3 to 6 g.
- Never combine with nitrate heart medicine without a doctor's approval.
What is nitric oxide, and why does stamina depend on it?
Nitric oxide, written NO, is a gas made by the cells that line your arteries. It lasts only seconds, long enough to tell the muscle in the vessel wall to relax. The artery widens, resistance drops and more oxygen-rich blood reaches the working muscle. We animate this on our mechanism page. The NHLBI explains the wider system. Production declines with age, inactivity, smoking and excess weight, and rises reliably with aerobic exercise.
Two supply routes: arginine and nitrate
The body makes nitric oxide in two ways. The classic route converts the amino acid L-arginine using an enzyme called nitric oxide synthase. The second route recycles dietary nitrate from vegetables such as beetroot, spinach and rocket: mouth bacteria convert nitrate to nitrite, which becomes nitric oxide in the blood, especially when oxygen is low, as in hard exercise. One practical consequence: antibacterial mouthwash blunts the beetroot effect.
What do the trials show?
| Ingredient | Typical study dose | Finding | Confidence |
|---|---|---|---|
| Beetroot nitrate | 300 to 600 mg nitrate (about 500 mL juice), 2 to 3 h before or daily | Small gains in time to exhaustion and efficiency; less effect in elite athletes | Moderate |
| L-arginine | 3 to 6 g daily | Mixed; several null trials. Much is degraded in the gut and liver | Low to moderate |
| L-citrulline | 3 to 8 g | Raises blood arginine better than arginine itself | Moderate |
Browse the literature on beetroot and L-arginine yourself. The honest summary: beetroot is one of the better-supported legal endurance aids, and arginine is the weaker sibling.
Is it safe?
For healthy adults, food-level and supplement-level intakes are well tolerated; beetroot can turn urine pink, which is harmless. The important cautions are about drugs that use the same pathway. Nitroglycerin and other nitrates, and sildenafil-type ED medicines, all raise nitric oxide signalling; stacking them can drop blood pressure dangerously. Blood pressure tablets can add up too. One trial of high-dose L-arginine after a heart attack was stopped early, so men with recent cardiac events should not self-supplement.
How is L-arginine used in SodaPeak?
L-arginine is one of SodaPeak’s six ingredients, alongside maca root, Panax ginseng, Tribulus terrestris, horny goat weed and zinc. Beetroot is not in the formula; we cover it here because it is the fairest yardstick for any nitric oxide claim, and because a glass of beet juice pairs well with a daily gummy. One gummy cannot hold the gram-level amounts in the table above, and we say so on our ingredients page. Think of it as a daily contribution to the pathway, not a pre-workout dose. You will find pack sizes and today’s SodaPeak discount on the SodaPeak official website.
What raises nitric oxide most?
Exercise, by a distance. Thirty minutes of brisk movement most days up-regulates the enzyme that makes nitric oxide. Add leafy greens and beets to your plate, skip antibacterial mouthwash before training, do not smoke, and keep your waistline in check. The CDC activity guidelines are the baseline. Supplements sit on top of that foundation.
Want the product side of the story?
Serving, formula, the energy animation and the SodaPeak discount live on the SodaPeak official website.
View SodaPeak Sale PackagesFrequently asked questions
How long does beetroot take to work?
A single dose peaks in two to three hours; daily use for a week or more gives more consistent results.
Is L-citrulline better than L-arginine?
For raising blood arginine, yes. Many sports formulas now use citrulline for that reason.
Can I take these with blood pressure medication?
Ask your doctor. The effects can add together.