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L-Tryptophan 500 mg

Swanson
4.7
★ ★ ★ ★ ★
(925 ratings)
Tryptophan 500 mg
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Score83

500 mg of L-tryptophan offers a focused serotonin-precursor approach with good value, though the formula covers only one pathway.

How scoring works
Quantity:60 Capsule(s) • (60 servings)
Goals:
Stress Relief
Sleep Support
Mood Support

Score 83

500 mg of L-tryptophan offers a focused serotonin-precursor approach with good value, though the formula covers only one pathway.

How scoring works
$13.69($0.22 per serving)
iHerb
$ 13.69
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Analysis

L-tryptophan supplies a precursor used in serotonin and melatonin production. The 500 mg amount is a practical starting serving in a capsule.

The generic source does not disclose purity grade or fermentation details. Effects can vary with timing, diet, and individual metabolism.

No competing amino acids are listed, which supports focused timing away from protein-heavy meals. The formula is focused on one neurotransmitter pathway and does not provide broad sleep, stress, or mood coverage.

Who is it for
  • Adults seeking targeted sleep or mood support
  • Users starting with a moderate tryptophan amount
Best for
  • Evening or mood-support routines
  • Standalone tryptophan supplementation

Pros

  • Provides 500 mg of L-tryptophan
  • Contains no competing amino acids
  • Capsule format
  • Good value

Cons

  • Purity and fermentation details are not disclosed
  • Covers only one neurotransmitter pathway
  • Response may depend on meal timing and individual metabolism

Warnings

  • Do not combine L-tryptophan with SSRIs, SNRIs, MAO inhibitors, tramadol, triptans, or other serotonin-raising medicines without prescriber guidance.
  • Seek urgent care for agitation, confusion, heavy sweating, tremor, or a rapid heartbeat after a serotonergic combination because these can signal excessive serotonin.
  • L-tryptophan may cause drowsiness, so avoid driving or other alertness-dependent tasks until its effects are clear.

Nutrient quality

93 Highest impact

The standalone L-form avoids competing amino acids, but source-grade details are not supplied. The tryptophan amount is substantial for targeted supplementation.

Ingredient transparency

83 Highest impact

Every listed active has an individual amount and no proprietary blend hides key doses. Daily directions and the complete inactive-ingredient list are not supplied.

Customer satisfaction

67 High impact

The supplied average is favorable and the aggregate pool is moderate. No specific feedback is provided to assess recurring complaints or whether experience matches the intended use.

Value for money

86 Highest impact

Serving cost is moderate for the disclosed active amount. The focused design avoids paying for unnecessary active ingredients.

Report analysis

Goals

Stress Relief
Impact
Highest effect
B+ Goal FitA- Strength of SupportC+ CoverageA+ Formula Quality

L-tryptophan supplies a direct precursor for serotonin and may support mood balance and calm when intake or availability is limiting. The focused amino-acid formula does not address HPA-axis regulation or mineral-based nervous-system support.

The amount falls within a useful targeted range and no competing amino acids are present. Users taking serotonergic medicines such as selective serotonin reuptake inhibitors or monoamine oxidase inhibitors should avoid combining them without medical guidance because serotonin effects may add up.

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Sleep Support
Impact
Highest effect
B+ Goal FitA- Strength of SupportC CoverageA Formula Quality

L-tryptophan supports the body’s serotonin and melatonin production pathway. The focused formula may help sleep onset without directly supplying a hormone.

The amount reaches the targeted support range and no competing amino acids are present. The generic source lacks purity or fermentation details, but the capsule and dose are clear.

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Mood Support
Impact
High effect
B Goal FitB Strength of SupportD+ CoverageA+ Formula Quality

L-tryptophan is a direct serotonin precursor and may support mood when precursor availability is limiting. The focused amount is useful, though the label gives no purity, fermentation, or grade detail.

The single-active design provides depth in one neurotransmitter pathway but no broader stress or structural support. L-tryptophan may compound serotonergic antidepressants and can cause drowsiness in some users.

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Ingredients

IngredientAmount per serving
L-Tryptophan
500 mg
Adults 18–50
Report overview
Tryptophan · 500 mg OverallScore84
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value

The L-Tryptophan source has no specific purity, fermentation, or grade disclosure. No competing large neutral amino acids are present, supporting targeted brain uptake. The clearly listed 500 mg amount falls within the targeted support range, and cost efficiency is favorable.

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