{
  "dataset": "tryptophan-cost-by-brand",
  "title": "L-Tryptophan Supplements Compared — cost per gram and per ~1 g sleep dose",
  "sourcePage": "https://verifiedsupplementdata.com/tryptophan/best-overall/",
  "license": "CC BY 4.0",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Verified Supplement Data (2026), L-Tryptophan Cost Comparison",
  "dateModified": "2026-07-19",
  "methodology": "The tryptophan sleep-research literature (Sutanto 2022 meta-analysis; Hartmann 1982 review of 40 controlled trials) clusters around a ~1 g/day dose, with doses of 1 g or more showing a clearly stronger effect than doses under 1 g. Cost per gram = live Amazon price divided by total grams of L-tryptophan per container (servings x mg per serving). Cost per ~1 g dose equals cost per gram, since the studied dose is ~1 g. Most products here are sold as 500 mg capsules (2 capsules = 1 g); one product (NOW Foods 1,000 mg) reaches the dose in a single tablet.",
  "headline": {
    "productsCompared": 6,
    "cheapestPer1gDose": 0.166,
    "priciestPer1gDose": 0.444,
    "spreadMultiple": 2.7,
    "note": "All six products are pharmaceutical/food-grade fermentation-derived L-tryptophan from the modern, FDA-regulated post-1990 supply chain — not the 1989 contaminated lots."
  },
  "columns": [
    "brand",
    "product",
    "form",
    "mgPerServing",
    "capsPerServing",
    "servings",
    "totalGrams",
    "price",
    "costPerGram",
    "costPer1gDose",
    "capsFor1g",
    "testing"
  ],
  "units": {
    "mgPerServing": "mg",
    "totalGrams": "g",
    "price": "USD",
    "costPerGram": "USD/g",
    "costPer1gDose": "USD"
  },
  "products": [
    {
      "brand": "BulkSupplements",
      "product": "BulkSupplements.com L-Tryptophan Capsules 500 mg",
      "slug": "bulksupplements-l-tryptophan-500mg",
      "form": "Capsule",
      "mgPerServing": 1000,
      "capsPerServing": 2,
      "servings": 120,
      "totalGrams": 120,
      "price": 19.97,
      "costPerGram": 0.166,
      "costPer1gDose": 0.166,
      "capsFor1g": 2,
      "testing": "Manufactured in a GMP facility"
    },
    {
      "brand": "Nutricost",
      "product": "L-Tryptophan 500 mg (with BioPerine)",
      "slug": "nutricost-l-tryptophan-500mg",
      "form": "Capsule",
      "mgPerServing": 1000,
      "capsPerServing": 2,
      "servings": 60,
      "totalGrams": 60,
      "price": 14.95,
      "costPerGram": 0.249,
      "costPer1gDose": 0.249,
      "capsFor1g": 2,
      "testing": "Manufactured in a GMP facility"
    },
    {
      "brand": "Source Naturals",
      "product": "L-Tryptophan 500 mg",
      "slug": "source-naturals-l-tryptophan-500mg",
      "form": "Capsule",
      "mgPerServing": 1000,
      "capsPerServing": 2,
      "servings": 60,
      "totalGrams": 60,
      "price": 19.25,
      "costPerGram": 0.321,
      "costPer1gDose": 0.321,
      "capsFor1g": 2,
      "testing": "Manufactured in a GMP facility"
    },
    {
      "brand": "NOW Foods",
      "product": "L-Tryptophan 1,000 mg Double Strength",
      "slug": "now-foods-l-tryptophan-1000mg",
      "form": "Tablet",
      "mgPerServing": 1000,
      "capsPerServing": 1,
      "servings": 60,
      "totalGrams": 60,
      "price": 19.92,
      "costPerGram": 0.332,
      "costPer1gDose": 0.332,
      "capsFor1g": 1,
      "testing": "Manufactured in a GMP facility"
    },
    {
      "brand": "NOW Foods",
      "product": "L-Tryptophan 500 mg",
      "slug": "now-foods-l-tryptophan-500mg",
      "form": "Capsule",
      "mgPerServing": 1000,
      "capsPerServing": 2,
      "servings": 60,
      "totalGrams": 60,
      "price": 21.49,
      "costPerGram": 0.358,
      "costPer1gDose": 0.358,
      "capsFor1g": 2,
      "testing": "Manufactured in a GMP facility"
    },
    {
      "brand": "Doctor's Best",
      "product": "L-Tryptophan 500 mg",
      "slug": "doctors-best-l-tryptophan-500mg",
      "form": "Capsule",
      "mgPerServing": 1000,
      "capsPerServing": 2,
      "servings": 45,
      "totalGrams": 45,
      "price": 19.99,
      "costPerGram": 0.444,
      "costPer1gDose": 0.444,
      "capsFor1g": 2,
      "testing": "Vegan, Non-GMO, Gluten-Free (label claims)"
    }
  ]
}