Performance, Nitric Oxide Booster, 90 Capsules

Customer Ratings & Reviews

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4.8

Based on 866 ratings

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What customers say

(461)

iHerb Customer

Posted on 1/10/2025

United Kingdom

The Nutricost brand is known for its simple formulas, transparent ingredients, and excellent value. The core ingredients of this nitric oxide booster typically revolve around two key amino acids, which are the building blocks of the nitric oxide (NO) production pathway in the body.

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L-Citrulline (usually citrulline malate) Core Function: This is currently recognized as the most effective nitric oxide precursor. Although L-arginine is a direct raw material for NO production, most oral L-arginine is broken down by the liver before reaching the bloodstream (first-pass effect), resulting in very low absorption. Mechanism of Action: L-citrulline seamlessly bypasses liver breakdown, being absorbed by the kidneys and efficiently converted into L-arginine, significantly increasing blood arginine concentrations and providing ample fuel for nitric oxide production. The added value of Malate: In the citrulline malate form, the malic acid itself participates in the cellular energy cycle (the Krebs cycle), theoretically helping to reduce fatigue and boost energy levels. Evaluation: L-citrulline is the gold standard ingredient in any excellent nitric oxide booster. Its presence and dosage directly determine the product's effectiveness. The formula's logic is straightforward: "Provide the raw materials, produce NO." L-citrulline, the most orally absorbed amino acid, is used as the primary source, supplemented with L-arginine, a direct raw material, to maximize nitric oxide levels. It doesn't stimulate the nervous system like caffeine, but rather optimizes your physiological logistics system. Whether you're performing high-rep strength training or high-intensity circuit training, you'll notice increased muscle endurance and faster recovery between sets.

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iHerb Customer

Posted on 1/01/2026

United Kingdom

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I’ve been using this supplement for a short while and overall I’m pleased with it. The capsules are easy to take, and I appreciate that the ingredients are clearly listed with no unnecessary additives. I haven’t experienced any side effects, which is important to me. While it’s still early to comment on long-term benefits, it feels like a good-quality product and I’m happy to continue using it as part of my routine.

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Vik-Taller

Posted on 2/03/2026

Ukraine

nitric oxide

Verified Purchase

The ingredient is of high quality, neutral in taste, the size of the capsules is convenient for swallowing, the composition is almost perfect, the packaging is convenient, airtight, economical, take with the maximum amount, as it is much more profitable. To increase metabolism in cells, and greater endurance, especially during physical exertion. Nitric oxide can be obtained from leafy greens, nuts, etc., but supplements are also necessary to enhance its occurrence and positive effect on recovery.

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iHerbCustomer

Gold

Posted on 18/04/2026

Bahrain

953

871

170

Oxide Booster

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The size is excellent, the number of grains is very good, the quality is fantastic, the size is perfect for diets and athletes, the packaging is excellent, the taste is very good

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Alex

Silver

Posted on 28/08/2025

Italy

117

More pump and endurance in training 🏋️

Verified Purchase

This nitric oxide booster really helps you feel more stamina and pump during workouts. The capsules are easy to take, and the effects are noticeable within the first few weeks. Perfect for those looking for extra support during intense sessions, without harsh stimulants. Excellent 180-capsule format that lasts a long time.

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iHerbCustomer

Posted on 7/10/2025

United States

Great for your blood pressure awesome

Verified Purchase

Well, you do have to take three of these, but the size of the tabs are not bad. Ingredients are just high-quality and clean. The packaging is great super beneficial for your health as far as your blood pressure so good for us.

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iHerbCustomer

Silver

Posted on 17/04/2026

Ukraine

143

Perfectly

Verified Purchase

A man takes this sports supplement during active training. It improves blood circulation, muscle pumping, endurance and recovery. Provides longer activity due to better blood flow.

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GDMorry

Posted on 20/02/2026

Australia

I’ve looked all over for a good source of nitric oxide booster

Verified Purchase

I have looked all over for a good source of nitric oxide booster and this product appears to be a good quantity at a great price

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RodrigoL

Silver

Posted on 11/02/2026

Brazil

151

Performance

Verified Purchase

A supplement made with carefully selected, top-quality ingredients and a pleasant taste. I'm just starting to use it, but I'm already beginning to feel an improvement in my overall well-being.

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Nalaka

Posted on 9/02/2026

United Arab Emirates

Great quality and quantity!

Verified Purchase

I started taking these Nitric Oxide tablets and feel already the energy and power and my workouts and I do play basketball where I feel less fatigue.

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