l-Tryptophan
by Isotonix · powder · 3.5 oz.
- On the market (NIH)
- DSLD label 6193
- Serving 3.3 g (1 capful)
- 30 servings
l-Tryptophan by Isotonix lists 5 ingredients, 5 with an amount per serving of 3.3 g, such as 850 IU of vitamin A, 75 mg of vitamin C, 20 mg of niacin and 4 mg of vitamin B6, beside 3 Nutrition Facts rows (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on February 23, 2012.
What is in l-Tryptophan?
Each row as the label prints it, per serving of 3.3 g. 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 |
|---|---|---|---|
| Calories | 5 Calories | Not reported | |
| Total Carbohydrates | 1 g | 1% | 74% of 21,979 products listing carbohydrate give more (median 3 g). |
| Sugar | 1 g | Not reported | 69% of 11,807 products listing sugar give more (median 2 g). |
| Vitamin Aas Beta-Carotene | 850 IU | 17% | 88% of 5,772 products listing vitamin A give more (median 4,000 IU). |
| Vitamin Cas Ascorbic Acid | 75 mg | 125% | 62% of 18,583 products listing vitamin C give more (median 100 mg). |
| Niacin | 20 mg | 100% | 46% of 12,413 products listing niacin give more (median 20 mg). |
| Vitamin B6as Pyridoxine Hydrochloride | 4 mg | 200% | 59% of 15,277 products listing vitamin B6 give more (median 6 mg). |
| Sodiumas Sodium Bicarbonate | 40 mg | 2% | 56% of 14,514 products listing sodium give more (median 55 mg). |
| Potassiumas Potassium Bicarbonate | 160 mg | 5% | Higher than 69% of 11,614 products listing potassium (median 99 mg). |
| TryptoPure(R) L-TryptophanTryptoPure(R) L-Tryptophan Note: TryptoPure(R) is a trademark of Ajinomoto Company, Inc. (100% Pure USP Pharmaceutical-frade L-Tryptophan) | 500 mg | Not reported |
Not reported: no percentage is available for that row. A missing DSLD percentage does not establish whether an FDA reference value exists.
Source: NIH ODS Dietary Supplement Label Database, label 6193 (entered February 23, 2012), 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?
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.
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 adult use:
- For mood enhancement: Pour 1 level, white bottle capful of powder into the overcap. Add water to the line on the overcap (2 fl. oz./60 mL) and stir.
- For sleep support: Take 30 minutes prior to bedtime. Pour 1-2 level, white bottle capfuls of powder into the overcap. Add 2 fl. oz./60 mL (line on the overcap indicates 2 fl. oz./60 mL) of water per capful of powder and stir.
- Maximum absorption occurs when taken on an empty stomach. As a dietary supplement, take one or two times daily, or as directed by your healthcare provider.
- Warnings
- KEEP OUT OF THE REACH OF CHILDREN.
- If you are using any other prescription drugs or have an ongoing medical condition, you should consult your healthcare provider before using this product. Take this supplement separately from prescription drugs. Women who are pregnant or breastfeeding should not use this product.
- Do not drive or operate heavy machinery until you know how this product can affect you, as drowsiness may occur.
- Do not use if safety seal is broken or missing.
- Warning: If you are currently taking monoamine oxidase inhibitors (MAOI) or other antidepressants such as Zoloft or Paxil, psychoactive or tranquilizing drugs such as Clonopin or Valium, or pain medications such as Demerol or Ultram, you should consult your healthcare provider before using this product.
- Storage
- Store in a cool, dry place.
Source: label statements in DSLD label 6193.
What else is on the label?
Other ingredients: Malic Acid, Orange juice powder, Fructose, Citric Acid, Soy Lecithin, Silicon Dioxide, mango flavor, rebaudioside A, Lo Han extract, Orange flavor.
How many labels does l-Tryptophan have?
One label is on file, entered on February 23, 2012.
- Label 6193 (current) Entered February 23, 2012 · on the market · 3.5 oz.
DSLD also links this label to: I-Tryptophan (image 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 Market America, Inc. (distributor), Greensboro, NC. All Isotonix products.