```html
LifeSource Vitamins L-Tryptophan — 500 mg, Vcaps, 60 — Supports Mood & Sleep*
LifeSource Vitamins L-Tryptophan delivers 500 mg of this essential amino acid to support mood, restful sleep, and serotonin production. Crafted in FDA-registered, GMP-certified facilities for trusted quality.*
Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. In addition, we reference reviews from 39 leading health organizations and insights from 20 top global universities to ensure our guidance aligns with credible science.*
Clinically Studied Benefits
✓ Supports restful sleep & sleep continuity — improved wake-after-sleep onset with ≥1 g/day tryptophan (meta-analysis of human trials).* NIH/PubMed — Sutanto, 2022
✓ Promotes positive mood under stress — tryptophan-rich protein improved mood and cortisol responses during acute stress in vulnerable adults (double-blind RCT).* NIH/PubMed — Markus, 2000
✓ Improves morning alertness — evening tryptophan-rich protein enhanced next-day alertness and attention (RCT).* NIH/PubMed — Markus, 2005
✓ Supports mood during PMS — L-tryptophan (6 g/day luteal phase) improved premenstrual dysphoric symptoms vs placebo (double-blind RCT).* NIH/PubMed — Steinberg, 1999
✓ Helps maintain healthy sleep patterns — tryptophan supplementation supports better sleep quality in human trials.* NIH/PubMed — Hudson, 2005
✓ Promotes emotional wellness — precursor to serotonin supports mood balance in stress contexts.* NIH/PubMed — Markus, 2000
✓ Supports restful sleep onset — tryptophan aids sleep continuity in clinical evidence.* NIH/PubMed — Sutanto, 2022
✓ Contributes to mood stability — supports serotonin pathways for emotional wellness.*
✓ Helps maintain healthy sleep quality — improved parameters in human supplementation studies.* NIH/PubMed — Demisch, 1987
✓ Supports overall mood balance — precursor role aids serotonin production in wellness contexts.*
Additional / Promising Evidence
✓ May support appetite & cravings — serotonergic mechanisms link tryptophan to carbohydrate craving; human data are mixed.* NIH/PubMed — Wurtman, 1986
✓ May support sleep-wake rhythm — tryptophan is precursor to serotonin → melatonin (mechanistic, human physiology).* Endotext — 2022
✓ May aid cognitive performance under stress — tryptophan-rich protein improved attention in stress-vulnerable individuals.* NIH/PubMed — Markus, 2002
✓ Supports serotonin production — essential precursor for mood and sleep pathways.*
✓ Contributes to emotional balance — supports neurotransmitter pathways in wellness contexts.*
✓ Promotes restful night routine — evening use supports sleep quality in human studies.*
University-Led & Academic Studies
✓ Tryptophan for mood under stress — improved mood/cortisol responses in vulnerable adults (double-blind).* NIH/PubMed — Markus, 2000
✓ Tryptophan for morning alertness — evening use enhanced next-day attention (RCT).* NIH/PubMed — Markus, 2005
✓ Tryptophan for PMS mood — improved premenstrual dysphoric symptoms (double-blind RCT).* NIH/PubMed — Steinberg, 1999
Global Evidence & Reviews
✓ Tryptophan for sleep quality — meta-analysis shows reduced wake-after-sleep onset.* NIH/PubMed — Sutanto, 2022
✓ Tryptophan as serotonin precursor — supports mood and sleep pathways (review).* Endotext — 2022
✓ Tryptophan under stress — improved attention in stress-vulnerable individuals.* NIH/PubMed — Markus, 2002
We monitor research from the world’s leading institutions —
Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge University, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State University – Linus Pauling Institute, Tufts, Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with the highest standards of credible science.*
Key Ingredients
-
L-Tryptophan — essential amino acid precursor to serotonin and melatonin for mood and sleep support.*
-
Vegetable Cellulose — provides a vegan, allergen-free capsule.*
Brief Benefit Bullets
- Fuels positive mood under stress*
- Promotes restful sleep & sleep continuity*
- Supports insomnia relief in select adults*
- Encourages morning alertness after evening use*
-
3rd-party lab tested for purity & potency
Suggested Use
Take 1–2 Vcaps 2–3 times daily on an empty stomach, with the final dose at bedtime, or as directed by a healthcare professional. If pregnant, nursing, taking medications (e.g., SSRIs, MAOIs, or sedatives), or have a medical condition (e.g., liver disease, depression), consult your physician.*
Product Specifications
Serving Size — 2 Vcaps (1,000 mg L-Tryptophan)
Servings Per Container — 30
Form — Vcaps
Free From — Non-GMO, vegan, gluten-free, soy-free*
Quality — Third-party tested for identity, potency & purity
LifeSource Vitamins — Proudly American — Since 1992
*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.
LifeSource Vitamins L-Tryptophan — 500 mg, Vcaps, 60 — Supports Mood & Sleep* Clinically Studied Ingredients — NIH/PubMed!*
```
