L-Arginine 400 mg
by Signature Supplements · capsule · 100 capsules
- On the market (NIH)
- DSLD label 338803
- Serving 1 to 2 capsules; amounts per 2 capsules
- 50 servings
L-Arginine 400 mg by Signature Supplements lists one ingredient: 800 mg of L-arginine per serving of 2 capsules. Its current label entered the NIH Dietary Supplement Label Database on September 25, 2025.
What is in L-Arginine 400 mg?
Each row as the label prints it, per serving of 2 capsules. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| L-Arginine | 800 mg | Higher than 61% of 1,455 products listing arginine (median 500 mg). |
Source: NIH ODS Dietary Supplement Label Database, label 338803 (entered September 25, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.
Is that a lot?
Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.
The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.
The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.
Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.
Which products have the closest formulas?
6 products list the very same ingredients; the nearest amounts come first.
- Arginine Power 800 mgUltimate Nutrition Platinum Series same ingredients
- L-Arginine 850 mg Maximum StrengthSwanson same ingredients
- Super Strength L-Arginine 850 mgSwanson Premium Brand · off the market same ingredients
- ArginineVital Nutrients · off the market same ingredients
- ArginineDesigns for Health same ingredients
- L-Arginine Base (Vegan)PureBulk.com same ingredients
Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.
What does the label say about taking it?
Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.
- Directions
- Directions: For adults, take one (1) to two (2) capsules daily, preferably with a meal.
- Warnings
- Warning: Pregnant or lactating women should consult a doctor before using any product. Consult doctor before use if you have, or have had, kidney disease or if you are taking any medications or remedies such as those to treat high blood pressure, heart medications, muscle relaxants or diuretics.
- Discontinue use and consult your doctor if any adverse reactions occur, such as gastrointestinal discomfort or low blood pressure.
- Not intended for use by persons under the age of 18.
- Allergens and what it does not contain
- No: Chemical Fillers or Binders, Artificial coloring, artificial flavor, preservatives, yeast, corn, milk or milk derivatives, lactose, salt, sodium, soy, sugar, gluten, starch or wheat.
- Storage
- Store in a dry place and avoid excessive heat.
Source: label statements in DSLD label 338803.
What else is on the label?
Other ingredients: Cellulose, Diatomaceous Earth.
How many labels does L-Arginine 400 mg have?
One label is on file, entered on September 25, 2025.
- Label 338803 (current) Entered September 25, 2025 · on the market · 100 capsules
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Signature Supplements (distributor), San Clemente, CA. All Signature Supplements products.