Klaire Labs/SFI Health

L-Tryptophan

$43.99

*Free shipping applies to orders shipped within the Lower 48 States.


Free shipping on orders over $99.

The Promise

L‑Tryptophan — pure essential amino acid 2000 mg L‑Tryptophan per serving in vegetarian capsules

Simple, single‑ingredient L‑Tryptophan formula in HPMC capsules; supports the body's natural production of serotonin and melatonin as a biochemical precursor.*

Identity

L‑Tryptophan (essential alpha‑amino acid) — single active ingredient.

Principal ingredient & amount

2,000 mg L‑Tryptophan per serving (serving size: 4 capsules).

Formulation & delivery

Vegetarian capsule (hydroxypropyl methylcellulose) containing microcrystalline cellulose and ascorbyl palmitate.

Packaging & servings

22 servings per container; dose delivered across 2–4 capsules at bedtime as directed.

Why It Works

Why this formula is distinct Measured single‑ingredient dose and vegetarian delivery for predictable intake

Concentration, form, and simple excipients let you control dosing and avoid added actives.

01

Potent single dose

Provides a concentrated 2,000 mg L‑Tryptophan per 4‑capsule serving for consistent intake.

02

Biochemical precursor

L‑Tryptophan is the direct metabolic precursor to serotonin and melatonin in the body.

03

Vegetarian capsule

Capsule material is hydroxypropyl methylcellulose (HPMC), suitable for vegetarian diets.

04

Minimal excipients

Contains microcrystalline cellulose and ascorbyl palmitate only—no added active herbals or vitamins.

Reviews

Customer Reviews

Your Journey

How to use Clear dosing, safety checks, and handling

Follow labeled directions; heed warnings about interactions, drowsiness, and child safety.

Directions

Suggested use

Adults: 2 to 4 capsules at bedtime or as directed by a healthcare professional. Serving size: 4 capsules.

Precautions

Consult before use

Consult with your physician if you are pregnant or nursing, or have any medical condition, or taking prescription drugs (including antidepressants such as MAOIs and SSRIs, and sedatives), or under the age of 18 years.

Safety

Drowsiness & activities

May cause drowsiness. Do not use with alcoholic beverages or before and while operating a motor vehicle or machinery.

Storage & child safety

Keep secure

KEEP OUT OF REACH OF CHILDREN.

Product education

L-Tryptophan: Support for Sleep & Wellbeing*

L-Tryptophan is an essential alpha-amino acid that serves as a fundamental building block for proteins and crucial brain-signaling chemicals. As a direct precursor to the neurotransmitters serotonin and melatonin, L-Tryptophan plays a vital role in regulating mood and the sleep-wake cycle. Supplementation has been shown in numerous clinical trials to be a safe and well-tolerated way to support a sense of wellbeing, calmness, relaxation, and appetite control.*

How It Works: A Precursor to Serotonin and Melatonin

This formula provides a potent dose of the essential amino acid L-Tryptophan, which the body can use to naturally produce key neurotransmitters.

Supporting Mood and Calmness
In the brain, L-Tryptophan is converted into serotonin, often called the “feel-good” neurotransmitter. Healthy serotonin levels are crucial for maintaining a balanced mood, promoting a sense of calm, and controlling appetite.*

Promoting Restful Sleep
Serotonin is then further converted into melatonin, the body’s primary sleep hormone. By providing the initial building block, L-Tryptophan supplementation supports the body’s natural production of melatonin, which is essential for promoting restful and restorative sleep.*

  • An essential amino acid that supports sleep and wellbeing*
  • Acts as a precursor to the neurotransmitters serotonin and melatonin
  • Promotes a sense of calmness and relaxation*
  • May help with appetite control*
  • Best taken on an empty stomach for optimal results

Supplement record

Review serving details and ingredients for this product.

Supplement Facts:
Suggested Use: Adults: 2 to 4 capsules at bedtime or as directed by a healthcare professional. Children: As directed by a healthcare professional.
Serving Size: 4 Capsules
Servings Per Container: 22
Ingredient Amount %DV
L-Tryptophan 2,000 mg *
Other ingredients: Vegetarian capsule (hydroxypropyl methylcellulose, water), microcrystalline cellulose, and ascorbyl palmitate.
*Daily Value not established.
Warning Consult with your physician if you are pregnant or nursing, or have any medical condition, or taking prescription drugs (including antidepressants such as MAOIs and SSRIs, and sedatives), or under the age of 18 years. May cause drowsiness. Do not use with alcoholic beverages or before and while operating a motor vehicle or machinery. KEEP OUT OF REACH OF CHILDREN.