Name: Nitrates+
Brand: 4Endurance Pro
SKU: 400120
Price: 19.99 EUR
Availability: InStock
Rating: 2.4 (5 reviews)

4Endurance Pro Nitrates+ - 90 capsules dietary supplement, black bottle with gold lid and label showing health benefits.

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Nitrates+ 4Endurance Pro is a unique nitrate formula designed for athletes who want to increase their endurance during intense exercise and power output in sprints.

Nitrates+ is based on 3 natural sources of nitrates and Arginine HCL that improve blood flow, increase oxygen utilization (indirectly boosting VO2 max), and delay fatigue during intense exercise.

Nitrates will help you improve your endurance in four ways

By Improving blood flow: Nitrates are converted in the body to nitric oxide, a compound that helps dilate blood vessels, improving blood flow and oxygen delivery to muscles during exercise. This will enhance endurance and performance.
By increasing exercise efficiency: Nitrates reduce the so-called oxygen cost of exercise. This means you can perform at the same intensity while using less oxygen, improving endurance and performance.
By reducing fatigue: By improving muscle oxygenation and efficiency, nitrates delay fatigue during prolonged exercise, allowing you to train longer and harder.
By improving nutrient absorption: Nitrates enhance blood flow and nutrient delivery to muscles post-exercise.

Natural source of nitrates

Nitrates+ contains 3 natural sources of nitrates:

beta vulgaris extract (beet),
red spinach extract,
arugula extract (rocket).

L-Arginine HCL

Arginine hydrochloride (arginine HCL) is crucial for nitric oxide production, thereby improving blood flow and circulation due to its role in nitric oxide production. It also enhances endurance and reduces fatigue during physical activity.

Improve your endurance and sprint power with Nitrates+!

Improves blood flow
Reduces oxygen cost of exercise
Delays fatigue during exercise
Increases time to exhaustion
Helps with muscle recovery

Take 3 capsules with water approximately 30 minutes before exercise.

On non-training days, take 3 capsules in the first half of the day.

Attention! People who take medication for heart conditions or have an allergy to nitrates or nitrites should not take this product!

	Per serving (3 capsules)	RDA*
Beta vulgaris extract 10:1	500 mg	*
L-Arginine HCL	500 mg	*
Red spinach extract (9% nitrates)	400 mg	*
Arugula extract (10:1)	250 mg	*

Dietary supplement. Ingredients: Beta vulgaris, L-Arginine, Red spinach extract, Argula extract. Other ingredients: vegan capsule, lubricant, magnesium stearate. The product can cotain oats, barley, wheat, fish, milk, and soy. Net quantity: 90 capsules.

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Response to above reply to Review

thanks for your response. I appreciate the clarification – however, it doesn't really address the core issue.

Even assuming optimal absorption, the nitrate content per serving (based on your own ingredient breakdown) adds up to only around 75–125 mg of nitrate per 3-capsule dose. This is far below the 300–600 mg per day consistently shown in peer-reviewed studies (e.g., Wylie et al., 2013 & 2019; Bailey et al., 2009) to produce measurable performance benefits in endurance sports.

Standardization is important – but it doesn't compensate for insufficient absolute quantity. Suggesting users "just take more" may technically be possible, but that raises the question why a single serving doesn’t meet the evidence-based threshold in the first place.

To be clear: I value product quality and formulation. But unless the nitrate dosage per daily recommendation is adjusted or transparently clarified - and not misleadingly giving the impression of a much higher nitrates dosage, this product cannot be expected to deliver the effects shown in the literature.

Hello,
Thank you for the reply. We truly appreciate your attention to detail and your interest in the efficacy of our products.
You're right that many studies, such as those by Wylie et al. and Bailey et al., have demonstrated performance benefits in endurance sports with nitrate intakes in the range of 300–600 mg per day. However, it's important to consider the context in which those doses are administered and absorbed.

As we mentioned earlier, those studies typically use juice or plant-based sources of nitrates, where absorption rates are lower, often around 60% or even less, due to the presence of plant fibers, competing nutrients, and variability in individual gut microbiota. This necessitates a higher intake to achieve a certain blood nitrate level.

Our product, on the other hand, is standardized and concentrated, providing highly bioavailable nitrates in capsule form with minimal interference in absorption. The aim is not to replace dietary nitrate intake, but to supplement it strategically, especially before training or racing, when timing and availability matter most.

We also want to emphasize that the goal is not to take the full day’s worth of nitrates in a single serving. That approach would not align with how the body utilizes nitrates efficiently or safely, and the Recommended Daily Allowance (RDA) serves more as a guidance value, not something meant to be consumed all at once.

Most athletes already obtain varying amounts of nitrates through their daily diet. Our supplement is designed to top up levels when it matters most—such as shortly before physical exertion—to support performance without needing to consume impractically large volumes of vegetables or juice at that moment.

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