Healthy Blood Flow* Endurance Support* 60 Vegan Capsules Vegan Gluten-Free Non-GMO Made in USA
Nitric Oxide Capsules, L-Citrulline & L-Arginine: Healthy Blood Flow, Endurance Support, 60 Vegan Capsules

Nitric Oxide Capsules, L-Citrulline & L-Arginine

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Nitric Oxide Capsules, L-Citrulline & L-Arginine: Healthy Blood Flow, Endurance Support, 60 Vegan Capsules
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine: Healthy Blood Flow, Endurance Support, 60 Vegan Capsules
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine: L-Citrulline, L-Arginine HCl, L-Arginine AKG
  • Nitric Oxide Capsules, L-Citrulline & L-Arginine on a wooden gym bench in bright morning light beside a pair of dumbbells
Nitric Oxide Capsules, L-Citrulline & L-Arginine
4.3/5 | 4 verified reviews

Nitric Oxide Capsules, L-Citrulline & L-Arginine

Made to support healthy circulation, nutrient delivery to working muscles and recovery after exercise, with citrulline and arginine in two capsules a day.*

Two capsules a day. Caffeine-free.
  • Supports normal blood flow, so oxygen and nutrients reach the muscles you train.*
  • Helps support endurance, muscle function and recovery after hard sessions.*
  • L-citrulline DL-malate 400 mg, L-arginine HCl 350 mg and L-arginine AKG 50 mg per serving.
  • No caffeine and no powder to mix; one bottle of 60 vegan capsules lasts 30 days.

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How It Works

Inside your blood vessels, an enzyme turns arginine into nitric oxide (NO).* NO signals the smooth muscle in the vessel walls to relax, and wider vessels let more blood, oxygen and nutrients through.* Your body recycles citrulline into arginine, which helps keep the supply steady.* Arginine alpha-ketoglutarate pairs arginine with AKG, a compound your cells make naturally.* Together they support circulation, endurance and muscle function.*
What's Inside

Per serving (2 capsules):

  • L-Citrulline DL-Malate, 400 mg: the amino acid citrulline joined to malic acid, to support nitric oxide production.*
  • L-Arginine Hydrochloride, 350 mg: the amino acid arginine, to support healthy blood flow.*
  • L-Arginine Alpha-Ketoglutarate, 50 mg: arginine joined to AKG, to support nutrient delivery to muscles.*

Other ingredients: cellulose (the vegetable capsule) and brown rice flour.
How to Take It

Adults take two capsules a day with 6–8 oz (177–237 ml) of water, or as directed by a healthcare professional. One bottle holds 60 capsules, a 30-day supply. There is no caffeine in it, which leaves you free to choose a time that suits your day and your training.
Quality & Safety

Made in the USA in an FDA-registered facility that follows Good Manufacturing Practices (GMP). Vegan friendly, vegetarian, gluten-free, non-GMO and allergen-free.

  • Do not take more than two capsules a day.
  • If you are pregnant or nursing, under 18, or have a known medical condition, ask a doctor before use.
  • Keep out of reach of children. Do not use if the safety seal is damaged or missing.
  • Store in a cool, dry place.
Vegan Gluten-Free Non-GMO Made in USA
Nitric Oxide Capsules, L-Citrulline & L-Arginine on a wooden gym bench in bright morning light beside a pair of dumbbells

Same Program, Same Weights. Flat Every Time.

You show up, you follow the plan, you count every rep. Some sessions just feel flat, as if the effort never fully reaches the muscles you are working.

  • The last set where the bar barely moves
  • A pre-workout scoop that keeps you wired past midnight
  • Cutting the evening run short at the second mile
  • Training hard and still feeling flat at the gym

Nitric Oxide gives your body 400 mg of L-citrulline malate and two forms of arginine, the building blocks it uses to make nitric oxide, for healthy blood flow to working muscles.*

Nitric Oxide Capsules, L-Citrulline & L-Arginine: L-Citrulline, L-Arginine HCl, L-Arginine AKG

Citrulline and Arginine. No Scoop, No Caffeine.

Many pre-workout powders come with a shaker, a scoop and a big dose of caffeine.

This formula keeps it simple: 400 mg of L-citrulline DL-malate, 350 mg of L-arginine HCl and 50 mg of L-arginine AKG in two capsules, with no caffeine and nothing to mix.

  • 400 mg L-citrulline DL-malate, which your body turns into arginine, for circulation*
  • 350 mg L-arginine HCl, the amino acid behind nitric oxide, for blood flow*
  • 50 mg L-arginine AKG, to support nutrient delivery to working muscles*
  • 60 vegan capsules, no caffeine, so any time of day works

Two capsules a day with 6-8 oz of water, on training days and rest days, and 30 days per bottle.

What Two Capsules Bring to Every Session

Blood Flow

Citrulline and arginine help your body make nitric oxide, for healthy blood flow.*

Endurance

Made to support endurance and muscle function from the first set to the last.*

Recovery

Made to support recovery after hard sessions, as part of your routine.*

No Caffeine

No caffeine and no powder: two capsules you can take any time of day.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

What Customers Say

Why Our Nitric Oxide Capsules, L-Citrulline & L-Arginine Wins

BEST CHOICE
Nitric Oxide
 Watermelon juice Caffeine pre-workout powders Food alone
Measured dose every day
Nothing to mix or cook
Goes in a pill organizer
Two capsules, once a day
Caffeine-free

Made in FDA-registered facilities

Every SineoLabs product is made in an FDA-registered facility.

30-day money-back guarantee

Not right for you? Contact us within 30 days of your order and we will refund you.

Free US shipping

Every US order ships free. Subscriptions can be skipped, paused or cancelled anytime.

Frequently Asked Questions

  • It usually takes 2-4 days.

  • It gives your body citrulline and arginine, which it uses to make nitric oxide.* Nitric oxide helps blood vessels relax, supporting healthy circulation and the delivery of oxygen and nutrients to your muscles.*

  • Not in the usual sense. It has no caffeine and nothing to mix. You take two capsules a day as part of your routine, on training days and rest days.

  • Two capsules a day, swallowed with a glass of water (6–8 oz), or as your healthcare professional advises.

  • Supplements work best as part of a daily routine. One bottle lasts 30 days; take it every day, as the label directs.

  • Yes. The capsules are vegetable cellulose, and the formula is vegan friendly, gluten-free, non-GMO and allergen-free.

  • Watermelon is a natural source of citrulline, but a glass of juice gives you no set amount. Two capsules give you a measured 400 mg of L-citrulline DL-malate plus two forms of arginine every day, with nothing to keep cold.

  • If you take any medication or have a medical condition, ask your doctor before you start, as you should with any supplement.

  • No. You can buy it once, or subscribe and save on every order. You can skip, pause or cancel a subscription anytime.

  • Every order is covered by our 30-day money-back guarantee. If it's not right for you, contact us within 30 days for a refund.

Customer reviews

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Order for the people you care about too, and each one costs less. For adults. Ask your doctor before use if you are pregnant, nursing or taking medication.