PlainVitamins

L-Tryptophan 1,000 mg

by Source Naturals · tablet or pill · 90 tablets

  • On the market (NIH)
  • UPC 0 21078 02610 5
  • DSLD label 274811
  • Serving 1 tablet
  • 45 servings

L-Tryptophan 1,000 mg by Source Naturals lists 2 ingredients, 2 with an amount per serving of 1 tablet, such as 44 mg of vitamin B6 and 2 g of L-tryptophan. Its current label entered the NIH Dietary Supplement Label Database on November 22, 2022.

What is in L-Tryptophan 1,000 mg?

Each row as the label prints it, per serving of 1 tablet. 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).

L-Tryptophan 1,000 mg: Supplement Facts rows against the market (DSLD label 274811, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin B6as Pyridoxine Hydrochloride44 mg2,200%Vitamin B6 in L-Tryptophan 1,000 mg against 15,277 products44 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg44 mg

Higher than 86% of 15,277 products listing vitamin B6 (median 6 mg). Per day at the most servings: 88 mg.

L-Tryptophan2 gTryptophan in L-Tryptophan 1,000 mg against 605 products2,000 mg per serving; the middle half of products list 55 mg to 471 mg, the median 123 mg.2,000 mg

Higher than over 99% of 605 products listing tryptophan (median 123 mg). Per day at the most servings: 4,000 mg.

Source: NIH ODS Dietary Supplement Label Database, label 274811 (entered November 22, 2022), 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?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • Its 2,000 mg of L-tryptophan (filed by NIH under tryptophan) is higher than over 99% of the 605 tryptophan products that print an amount; 1 list more.

The NIH database records 1 to 2 servings 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?

4 products list the very same ingredients; the nearest amounts come first.

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
Suggested Use: 1 tablet 1 to 2 times daily, between meals and preferably with fruit juice. To support restful sleep, take 2 tablets before bed.
Warnings
Caution: If you are pregnant, may become pregnant, breastfeeding, or are taking medications such as SSRIs or MAOIs consult your health care professional before using this product.
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.
This product may cause drowsiness.
Allergens and what it does not contain
Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no preservatives, or artificial color, flavor or fragrance.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 274811.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Stearic Acid, modified Cellulose Gum, Magnesium Stearate, Silica.

How many labels does L-Tryptophan 1,000 mg have?

One label is on file, entered on November 22, 2022.

  1. Label 274811 (current) Entered November 22, 2022 · on the market · 90 tablets · UPC 0 21078 02610 5

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Source Naturals, Inc. (distributor), Santa Cruz, CA. All Source Naturals products.

Where next?