Amino acid · Supplement ingredient
Tryptophan
Tryptophan is listed on 801 U.S. supplement product labels in the NIH DSLD, #249 of 4,614 by label frequency.
- 801
- Products
- #249 of 4,614
- By frequency
How common is Tryptophan?
Number of supplement labels listing Tryptophan vs nearby amino acid ingredients
- Leucine
Leucine
4,582 products
- Glutamine
Glutamine
2,515 products
- Valine
Valine
1,971 products
- Isoleucine
Isoleucine
1,946 products
- Tyrosine 1,744
Tyrosine
1,744 products
- Tryptophan 801
Tryptophan
801 products
Products containing Tryptophan
Nearby Ingredients in Amino acid
Other ingredients in the Amino acid category cataloged in the NIH DSLD. Useful for comparing how common different nutrients are across the US supplement market.
Nationwide ingredients with similar DSLD presence
Two peer sets for Tryptophan: closest on total DSLD label listings (801 here) and closest on distinct brands that list it (254 here). Peers exclude the same DSLD category, and rows stay link-disjoint so each axis is a distinct neighborhood.
Similar label frequency
Nearest other ingredients by distinct DSLD product labels (floored at ≥50), outside this category.
Similar brand breadth
Nearest other ingredients by distinct brands listing them (floored at ≥100 brands), distinct from the label-frequency row.
Frequently asked about Tryptophan
How many supplement products contain Tryptophan? ▼
Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD). Regulatory reference: Source: Dietary Supplement Health and Education Act (DSHEA), 1994, 21 U.S.C. § 321(ff).
Disclaimer, Not Medical Advice: Information on this page is based on manufacturer-declared label data and is provided for educational and reference purposes only. It does not constitute medical, nutritional, or health advice. Consult a licensed healthcare provider before starting, stopping, or combining any supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.
Read our methodology , how this data is sourced, computed, and verified.
Every figure on PlainVitamins is rendered directly from the NIH Dietary Supplement Label Database (DSLD), no number is typed in by an editor. Ingredient figures are computed directly from the NIH DSLD, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.