PlainVitamins

L-Tryptophan

by Lidtke · capsule · 120 vegan capsules

  • On the market (NIH)
  • UPC 6 30610 00325 4
  • DSLD label 257272
  • Serving 1 to 3 capsules; amounts per 3 capsules
  • 40 servings

L-Tryptophan by Lidtke lists 12 ingredients, 12 with an amount per serving of 3 capsules, such as 90 mg of vitamin C, 15 mg of vitamin B2, 60 mg of vitamin B3 and 10 mg of coenzyme vitamin B6. Its current label entered the NIH Dietary Supplement Label Database on December 18, 2021.

What is in L-Tryptophan?

Each row as the label prints it, per serving of 3 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).

L-Tryptophan: Supplement Facts rows against the market (DSLD label 257272, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Calcium Ascorbate90 mg150%Vitamin C in L-Tryptophan against 18,583 products90 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg90 mg

57% of 18,583 products listing vitamin C give more (median 100 mg).

Vitamin B2as Riboflavin 5-Phosphate15 mg885%Riboflavin in L-Tryptophan against 9,824 products15 mg per serving; the middle half of products list 1.7 mg to 25 mg, the median 4 mg.DV 1.3 mg15 mg

Higher than 69% of 9,824 products listing riboflavin (median 4 mg).

Vitamin B3as Niacinamide60 mg300%Niacin in L-Tryptophan against 12,413 products60 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg60 mg

Higher than 83% of 12,413 products listing niacin (median 20 mg). 1.7 times the adult UL a day.

Coenzyme Vitamin B610 mg500%Vitamin B6 in L-Tryptophan against 15,277 products10 mg per serving; the middle half of products list 2 mg to 20 mg, the median 6 mg.DV 1.7 mgUL 100 mg10 mg

Higher than 55% of 15,277 products listing vitamin B6 (median 6 mg).

Pyridoxal 5-Phosphate15 mg
Magnesium15 mg4%Magnesium in L-Tryptophan against 14,003 products15 mg per serving; the middle half of products list 30 mg to 200 mg, the median 86 mg.UL 350 mgDV 420 mg15 mg

87% of 14,003 products listing magnesium give more (median 86 mg).

Magnesium Bisglycinate150 mg
Folic Acid800 mcg200%Folate in L-Tryptophan against 7,022 products800 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.800 mcg

Higher than 81% of 7,022 products listing folate (median 400 mcg).

TryptoGoldas L-TryptophanUSP1,050 mgTryptophan in L-Tryptophan against 605 products1,050 mg per serving; the middle half of products list 55 mg to 471 mg, the median 123 mg.1,050 mg

Higher than 97% of 605 products listing tryptophan (median 123 mg).

L-Lysine Hydrochloride300 mgLysine in L-Tryptophan against 1,250 products300 mg per serving; the middle half of products list 148.25 mg to 996.25 mg, the median 500 mg.300 mg

60% of 1,250 products listing lysine give more (median 500 mg).

Curcuminas Turmeric150 mgCurcumin in L-Tryptophan against 550 products150 mg per serving; the middle half of products list 50 mg to 400 mg, the median 200 mg.150 mg

52% of 550 products listing curcumin give more (median 200 mg).

Taurine125 mgTaurine in L-Tryptophan against 2,337 products125 mg per serving; the middle half of products list 110 mg to 1,000 mg, the median 500 mg.125 mg

74% of 2,337 products listing taurine give more (median 500 mg).

Source: NIH ODS Dietary Supplement Label Database, label 257272 (entered December 18, 2021), version 9.4.0. See the label on DSLD. 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:

  • At 1 serving a day, the most its directions give, the label lists 60 mg of niacin, 1.7 times the adult Tolerable Upper Intake Level.
  • Its 1,050 mg of TryptoGold (filed by NIH under tryptophan) is higher than 97% of the 605 tryptophan products that print an amount; 17 list more.

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?

1 product lists 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
Directions (Adults): Take one (1) to three (3) capsules or as directed by your doctor. Best if taken at bedtime or between meals. For children, consult your doctor.
Warnings
Caution: Keep out of reach of children.
If you are pregnant, lactating, taking any medications (especially MAOIs, Tricyclics, or SSRIs), or have a medical condition, consult your doctor.
Discontinue use if adverse reaction occurs. Do not use if seal is damaged or missing.
Toll Free: 1-800-404-8185 Adverse events may be reported above.
Allergens and what it does not contain
No added gluten, yeast, wheat, rice, corn, soy, dairy, eggs, peanuts, fish, shellfish, sugar, artificial color or artificial flavor. Non-GMO
Storage
Keep lid tightly closed. Keep in a cool, dry place.

Source: label statements in DSLD label 257272.

What else is on the label?

Other ingredients: vegan Capsule.

How many labels does L-Tryptophan have?

2 labels are on file under this name since March 24, 2020: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 257272 (current) Entered December 18, 2021 · on the market · 120 vegan capsules · UPC 6 30610 00325 4
  2. Label 215289 Entered March 24, 2020 · on the market · 250 grams Powder · UPC 6 30610 00375 9

DSLD also links this label to: L-Tryptophan, USP (package size difference, same product), L-Tryptophan (package size difference, same product).

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

Who makes it?

The label names Lidtke Technologies (manufacturer), Chandler, AZ. All Lidtke products.

Where next?