PlainVitamins

amino acid

Ornithine supplements

Half of the 258 ornithine supplements in the NIH label database that print an amount list 400 mg or less per serving; the middle half list 100 mg to 900 mg (DSLD version 9.4.0, January 2026). The 24 products whose only supplement ingredient is ornithine list a median of 900 mg.

Products listing it
441258 print an amount; 183 list it inside a blend without an amount
Median per serving
400 mgmiddle half 100 mg to 900 mg

How much ornithine do supplements contain?

The median product lists 400 mg per serving. One in ten lists 32.1 mg or less, one in ten 1,000 mg or more. The amount printed most often is 1,000 mg (36 products).

Products by amount of ornithine per serving

258 products, log scale; extreme 0.2% at each end left out of the drawing.

Ornithine: products by amount per serving3 mg10 mg100 mg1,000 mg
Ornithine: products by amount per serving3 mg10 mg30 mg100 mg300 mg1,000 mg
Ornithine: products by amount per serving3 mg10 mg30 mg100 mg300 mg1,000 mg
Ornithine: products by amount per serving3 mg10 mg30 mg100 mg300 mg1,000 mg
Ornithine: products by amount per serving3 mg10 mg30 mg100 mg300 mg1,000 mg
The amounts printed most often
Amount per servingProductsFor example
1,000 mg36 L-Arginine L-Ornithine 2500 (GNC Pro Performance); Arginine & Ornithine (GNC Pro Performance); Pre-Workout For Women Strawberry (Nutricost)
500 mg28 Awe Slim! (NOW); Bi-Amino Complex (Vitamin World); L-Arginine-HCL L-Ornithine-HCL (PureBulk.com)
250 mg17 Esr (OL Olympian Labs); L-Arginine & L-Ornithine Complex (VitaCeutical Labs); Arginine & Ornithine (OL Olympian Labs)
400 mg16 Amino Supreme (Bricker Labs); ZZZ Razzzberry Lemonade (Core Nutritionals); ZZZ Knockout Punch (Core Nutritionals)
200 mg12 Arginine Power Super Stack (NOW Sports); Take Heart II Without Hormones (Allergy Research Group); Arginine Stack Tropical Punch (NOW Sports)
300 mg11 HGH-R Isotropin 1500 mg (NewtonEverett); Anabolism (Musclegen Performance Nutrition); Anti-Aging Complex (ViMulti)
150 mg9 Skinny Dreams (ViMulti Beautiful Me); P.M. Weight Loss (ViMulti); Night Kit (S Sculpt)
900 mg9 Tri-Amino Complex (Vitamin World); Tri-Amino (Douglas Laboratories); Arginine Ornithine & Lysine (Wonder Laboratories)
1,500 mg8 100% Pure L-Ornithine 1500 Milligrams (NutraBio); 100% Pure L-Ornithine (NutraBio); Pro-GH Fruit Punch Flavor (NOW Sports)
45 mg7 Maximum Strength Amino 1500 (Precision Engineered); Amino 3000 (MET-Rx); Hardcore Amino 3000 (MET-Rx)

Source: Supplement Facts rows of every product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; amounts in one measure (weight).

Which products list the most ornithine?

On-market products, per serving, with a plausible amount: the rule leaves out likely entry slips, such as an amount far beyond every other label with no %DV or strength on the label to back it (each product page still shows its own amount, marked).

Have the amounts changed over the years?

Products whose current label entered DSLD in 2020 list a median of 400 mg; those entered in 2025, 775 mg.

Median ornithine per serving by the year the label entered DSLD (years with 20+ products)
YearProductsMedian per serving
202025400 mg
202121400 mg
202326300 mg
202434412.5 mg
202538775 mg

Source: DSLD label entry dates and amounts, current labels.

In which products and brands?

Products listing ornithine by DSLD product type

Ornithine by product typeOther Combinations164Amino acid/Protein86Botanical with Nutrients7Non-Nutrient/Non-Botanical1
Ornithine by product typeOther Combinations164Amino acid/Protein86Botanical with Nutrients7Non-Nutrient/Non-Botanical1
Ornithine by product typeOther Combinations164Amino acid/Protein86Botanical with Nutrients7Non-Nutrient/Non-Botanical1
Ornithine by product typeOther Combinations164Amino acid/Protein86Botanical with Nutrients7Non-Nutrient/Non-Botanical1
Ornithine by product typeOther Combinations164Amino acid/Protein86Botanical with Nutrients7Non-Nutrient/Non-Botanical1

Brands listing it most: NutraBio (22), NOW Sports (9), Metagenics (6), Core Nutritionals (5), Swanson (4), Nutri-West (4), Xtendlife (4), NOW (4), Precision Engineered (4), Source Naturals (4).

Every product listing ornithine

441 products, A to Z by name (page 3 of 9), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.

Where next?