Best Ornithine Supplements – Top 10 Brands Ranked for 2018

best-Ornithine-supplements-on-the-market

This is our official list of the best selling ornithine supplements on the market right now.

These 10 l-ornithine brands have been ranked because they dominate the e-commerce sales charts, fitness bloggers love them and they have the highest user reviews online.

Top 10 L-Ornithine Products Compared

Heads up, there are affiliate links in this article, so if you buy something, we get a cut of the sale.


1. BulkSupplements Pure L-Ornithine HCL Powder

BulkSupplements Pure L-Ornithine HCL Powder

Like the manufacturer’s name indicates, BulkSupplements offers high-grade crystalline l-ornithine hydrochloride in a bulk powder form. Bulk powder form offers many convenient options for ingestion. You can add it to protein shakes, smoothies, or juice, or you can buy your own capsules and create your own single-capsule dosage size.

BulkSupplements offers l-ornithine hcl powder in several bag sizes, including 100-gram, 250-gram, 500-gram, 1-kilogram, 5-kilogram and 25-kilogram for both personal or commercial/retail use.

Specs and Highlights

  • Each 1/4 teaspoon supplies 800 milligrams of l-ornithine hydrochloride
  • Mix with hot water for best results
  • Two servings daily recommended

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2. NOW Foods L-ornithine

NOW Foods L-ornithine

NOW Foods cites l-ornithine as a precursor to other healthful substances, such as the amino acids citrulline, proline and glutamate, and creatine.

Each 120-capsule bottle contains 40 three-capsule servings. Manufactured in a cGMP facility, NOW Foods l-ornithine is also free of most common allergens, such as gluten, soy, nuts, eggs and dairy.

Specs and Highlights

  • 500 milligrams of l-ornithine hydrochloride per capsule
  • Vegan- and vegetarian-safe
  • Contains no GMO ingredients

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3. Jarrow Formulas Arginine and Ornithine

Jarrow Formulas Arginine and Ornithine

Jarrow Formulas features ornithine stacked with arginine, an amino acid used to build proteins in the body. Arginine is semi-essential, which means your body cannot produce it, and you must obtain it from your diet or through supplementation.

Specs and Highlights

  • 500 milligrams of l-arginine per tablet
  • 250 milligrams of l-ornithine per tablet
  • Proprietary Easy-Solv tablets break down more readily during digestion
  • Suitable for vegans and vegetarians

4. Solgar L-Arginine/L-Ornithine

Solgar L-Arginine L- Ornithine Vegetable Capsules

Solgar’s l-arginine/l-ornithine stack is vegetarian-friendly and free of wheat, gluten and dairy. The serving size is one capsule, and the bottle contains 50 vegicaps, although there is a 100-vegicap size as well. Solgar recommends one to two capsules daily between meals.

As with all of its products, Solgar’s arginine/ornithine is kosher, and the company’s kosher certification number appears on its website.

Specs and Highlights

  • 500 milligrams of l-arginine per vegicap
  • 250 milligrams of l-ornithine per vegicap
  • Certified kosher
  • Safe for vegetarians
  • Free of soy, yeast, sugar and gluten
  • Tinted glass bottle prevents light damage, exposure to BPA and preserves freshness

5. NOW Foods L-Arginine/Ornithine

NOW Foods L-arginine ornithine

Billed as a supplement for proper protein metabolism, NOW Foods L-Arginine/Ornithine comes in a 250-capsule bottle supplying 125 two-capsule servings. Typical of such stacks, each serving supplies arginine and ornithine in a 2:1 ratio.

GMP-certified and non-GMO, NOW Foods arginine stack is also free of sugar, soy, gluten, dairy, nuts and corn. NOW Foods suggests two capsules daily.

Specs and Highlights

  • 500 milligrams l-arginine per capsule
  • 250 milligrams l-ornithine per capsule
  • Can be taken with juice or water on an empty stomach before exercise or bed

6. Ultimate Nutrition Arginine Ornithine Lysine

Ultimate Nutrition Arginine Ornithine Lysine Capsules

Each capsule consists of a 1:1:1 ratio of arginine, ornithine and lysine. With a three-capsule serving, each 100-capsule bottle contains 33 servings plus one capsule. Ultimate Nutrition suggests three capsules daily before bedtime.

Specs and Highlights

  • 750 milligrams of l-arginine per capsule
  • 750 milligrams of l-ornithine per capsule
  • 750 milligrams of l-lysine percapsule
  • Take before bedtime or 30 minutes prior to workout
  • Stacks with other aminos, such as glutamine

7. Twinlab Inc L-Arginine & L-Ornithine

Twinlab Inc L-Arginine & L-Ornithine

Formulated in a 2:1 ratio, Twinlab Inc arginine/ornithine stack is a free-form version of the aminos in an easy-to-swallow capsule. The company offers a 100-capsule bottle as of 2017, with a recommended dose of one to three capsules daily on an empty stomach. Twinlab Inc manufactures its products in a NSF GMP registered facility.

Specs and Highlights

  • 500 milligrams arginine per capsule
  • 250 milligrams ornithine per capsule
  • Easy-to-swallow capsules

8. Puritan’s Pride L-Arginine L-Ornithine L-Lysine

Puritan's Pride L-Arginine L-Ornithine L-Lysine

Similar to the Ultimate Nutrition product mentioned above, Puritan’s Pride’s l-arginine/ornithine/lysine stack is a tri-amino supplement in caplet form. The product is gluten free and vegetarian.

Puritan’s Pride offers a 60-caplet bottle that yields 15 four-caplet servings. Four caplets twice daily are recommended, either on an empty stomach, before exercise or before bed.

Specs and Highlights

  • 1,1447 milligrams of l-arginine per four caplets
  • 900 milligrams of l-ornithine per four caplets
  • 1,200 milligrams of l-lysine per four caplets
  • Caplets are coated for easy swallowing
  • Product is Puritan’s Pride Quality Assured

9. Best Naturals Tri-Amino

Best Naturals Tri-Amino with L-Arginine, L-Ornithine, L-Lysine

Best Naturals offers its own tri-amino stack, combining free-form arginine, ornithine and lysine in a ratio identical to the same supplement by Puritan’s Pride. Made in the USA, and manufactured according to GMP, Best Naturals tri-amino is free of allergens and comes with a 30-day 100 percent money back guarantee.

Specs and Highlights

  • 1,447 milligrams of l-arginine per four caplets
  • 900 milligrams of l-ornithine per four caplets
  • 1,200 milligrams of l-lysine per four caplets
  • 250 caplets per bottle
  • Free of dairy, soy, sugar, preservatives and fish

10. Olympian Labs Arginine 500mg & Ornithine

OLYMPIAN LABS Arginine 500mg & Ornithine 250mg

Olympian Labs arginine and ornithine supplement is your basic 2:1 ratio stack in a one-vegicap serving. With a daily recommendation of up to three vegicaps, the 100 vegicap bottle contains from 33 to 100 servings.

Specs and Highlights

  • 500 milligrams l-arginine hydrochloride per capsule
  • 250 milligrams l-ornithine monohydrochloride
  • Tinted bottle prevents light damage and maintains freshness

What is L-Ornithine?

Ornithine occurs naturally in the body where it plays a part in the urea cycle, which entails the reduction of elevated ammonia levels within the body through urine production and excretion. Although classified as an amino acid, ornithine does not contribute to the building of the body’s proteins like other amino acids. Ornithine is nonessential, which means your body produces it on its own as opposed to deriving it from external sources.

During the urea cycle, also known as the ornithine cycle, ornithine binds to another substance called carbamoyl phosphate, which requires ammonia for its production. The subsequent conversion of this phosphate into another amino acid, L-Citrulline, yields urea, a byproduct. Consequently, ornithine functions as a catalyst, restoring your blood ammonia levels to optimal levels.

High levels of ammonia, a waste product of cellular metabolism, can impair your brain function and hasten the onset of fatigue during activity. By helping in keeping your blood ammonia at normal levels, ornithine inadvertently has the potential to enable you to work out for longer periods.

Things to Look for in a Good Ornithine Supplement

When shopping for ornithine, be sure that the product in question is indeed L-Ornithine. The “L-” before the amino acid name denotes a free-form amino acid. Free-form amino acids are “predigested,” so to speak. Most amino acids occur naturally in protein or peptide chains. For your body to utilize each amino acid as required, it must first digest the protein or peptide and break these chains.

Free-form amino acids do not exist within protein or peptide chains. Consequently, they are instantly available to your body, serving as the building blocks of new protein (muscle) and the foundation of new tissue (healing).

How to Take Ornithine

Read the instructions on each product label. It’s always better to err on the side of caution, so begin with the lowest dose to assess your tolerance. Increase dosages slowly. Daily ornithine doses in excess of 10 grams may cause diarrhea, but your threshold might be even lower. Luckily, ornithine has no known toxicity.

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Rick Grimes

Written by Rick Grimes

Rick's a former D1 athlete, and a current fitness nut with over 10+ years in the health and fitness industry. After getting his bachelors degree he became devoted to contributing accurate, concise and researched based information to the bodybuilding industry. When he's not researching supps, you can find him on Quora giving back to the community.