l-Tryptophan®

Amino Acids & Protein

Brand: Isotonix

PowderAmino acid/ProteinOn Market
Click to view full label

Net Contents

3.5 oz.

Serving Size

3.3 Gram(s)

Servings Per Container

30

Supplement Form

Powder

Bar Code (UPC/SKU)

Not specified

Product Version

REV 1209

Label Analysis

Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.

10Active Ingredients

10 distinct active ingredients are disclosed in Supplement Facts.

100%Amount Transparency

Every active ingredient discloses a specific amount per serving.

7% Daily Value Coverage

7 ingredients report a %DV; 3 meet or exceed 100% DV.

This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.

Supplement Facts

Serving Size: 3.3 Gram(s) · 1 per day

IngredientAmount Per Serving% Daily Value
Calories5 {Calories}
Total Carbohydrates1 g1%
Sugar1 g
Vitamin A(Beta-Carotene)850 IU17%
Vitamin C(Ascorbic Acid)75 mg125%
Niacin20 mg100%
Vitamin B6(Pyridoxine Hydrochloride)4 mg200%
Sodium(Sodium Bicarbonate)40 mg2%
Potassium(Potassium Bicarbonate)160 mg5%
TryptoPure(R) L-Tryptophan500 mg

Percent Daily Values are based on a 2,000 calorie diet

Other Ingredients

Malic AcidOrange juice powderFructoseCitric AcidSoy LecithinSilicon Dioxidemango flavorrebaudioside ALo Han extractOrange flavor

Target Groups

Adult (18 - 50 Years)

Label Claims

All OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Directions for adult use:

Suggested/Recommended/Usage/Directions

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.

Suggested/Recommended/Usage/Directions

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.

Suggested/Recommended/Usage/Directions

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 & Precautions

Precautions re: Children

KEEP OUT OF THE REACH OF CHILDREN.

Precautions re: Pregnant or Nursing or Prescription Medications

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.

Precautions re: All Other

Do not drive or operate heavy machinery until you know how this product can affect you, as drowsiness may occur.

Precautions re: All Other

Do not use if safety seal is broken or missing.

Precautions re: All Other

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

Storage

Store in a cool, dry place.

FDA Statements

FDA Statement of Identity

An Isotonic-Capable Dietary Supplement

FDA Disclaimer Statement

†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Other Label Statements

General Statements: All Other Content

Helps enhance and stabilize mood†

General Statements: All Other Content

Helps maintain healthy levels of serotonin†

General Statements: All Other Content

Helps promote the ability to clearly assess everyday situations†

General Statements: All Other Content

Lot #: Best when used by:

General Statements: All Other Content

May help to support a normal sleep cycle†

General: Product/Version Code

REV 1209

General Statements: All Other Content

The world's most advanced nutraceuticals

Manufacturer & Distributor

Distributor

Market America, Inc.

1302 Pleasant Ridge Road, Greensboro, NC, 27409

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Research & Studies

  • Effects of intragastric administration of tryptophan on the blood glucose response to a nutrient drink and energy intake, in lean and obese men

    SS Ullrich, PCE Fitzgerald, P Giesbertz, RE Steinert… - Nutrients, 2018 - mdpi.com

    … orally in capsules (dose: ~3 g) 45 min before a lunch meal, or administered intraduodenally over 90 min (dose ~3.3 g), tryptophan also markedly decreased energy intake in healthy …

    201825 citations
  • Effects of intraduodenal infusion of L-tryptophan on ad libitum eating, antropyloroduodenal motility, glycemia, insulinemia, and gut peptide secretion in healthy men

    RE Steinert, ND Luscombe-Marsh… - The Journal of …, 2014 - academic.oup.com

    … healthy volunteers (17), no effect was observed on plasma GLP-1, ghrelin, appetite, or food intake when L-tryptophan (… The control solution contained isotonic 118.3 mg CaCl 2 × 2H 2 O …

    2014103 citations
  • Effects of combined intraduodenal administration of lauric acid and l-tryptophan on postprandial plasma glucose, glucoregulatory hormones and gastric emptying in …

    J Anjom-Shoae, PCE Fitzgerald, BD Rose, V Bitarafan… - Diabetologia, 2026 - Springer

    … In healthy men, lauric acid (C12) and l-tryptophan (Trp), when administered intraduodenally … -dependent, and the solutions used were isotonic, we have reported that the effects of C12, …

    2026
  • Effects of intraduodenal administration of lauric acid and L-tryptophan, alone and combined, on gut hormones, pyloric pressures, and energy intake in healthy …

    C McVeay, PCE Fitzgerald, SS Ullrich… - The American Journal of …, 2019 - Elsevier

    Background The fatty acid, lauric acid (‘C12’), and the amino acid, L-tryptophan (‘Trp’), modulate gastrointestinal functions including gut hormones and pyloric pressures, which are …

    201920 citations
  • L-tryptophan supplementation can decrease fatigue perception during an aerobic exercise with supramaximal intercalated anaerobic bouts in young healthy men

    C Javierre, R Segura, JL Ventura… - International Journal …, 2010 - Taylor & Francis

    … by variations in the availability of L-tryptophan (a serotonin precursor) may alter neural drive. We examined the effect of L-tryptophan supplementation on physical performance by …

    201034 citations
  • A systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning

    AM Kikuchi, A Tanabe, Y Iwahori - Journal of dietary supplements, 2021 - Taylor & Francis

    … This systematic review includes 11 RCTs that examined the effects of TRP intake on positive and negative mood in healthy adult populations. We have targeted healthy adult men and …

    2021109 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2012-02-23. DSLD Label ID: 6193. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.