--- title: "L-Tryptophan vs Epithalon: Side-by-Side Comparison (2026)" url: https://www.bodyhackguide.co/compare/l-tryptophan-vs-epithalon description: "Compare L-Tryptophan vs Epithalon side by side. We earn a commission on some vendor links. Mechanism, half-life, dose range, side effects and prices." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) # L-Tryptophan vs Epithalon Side-by-side comparison of L-Tryptophan and Epithalon: mechanism, half-life, dose range, safety profile, and vendor pricing. L-Tryptophan: no price on file Epithalon from $34.99 ## Price snapshot ### L-Tryptophan Current low — 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ### Epithalon Current low $34.99 current listings 7-day low — not enough history yet 30-day low — not enough history yet 30-day change — not enough history yet ## L-Tryptophan L-Tryptophan is one of the nine essential amino acids — meaning the human body cannot synthesize it and must obtain it from dietary protein — and is the direct metabolic precursor to serotonin, melatonin, and (via a… No vendor price on file. Full L-Tryptophan profile (https://www.bodyhackguide.co/compound/l-tryptophan) ## Epithalon Epithalon (also spelled Epitalon, sequence Ala-Glu-Asp-Gly / AEDG) is a synthetic tetrapeptide designed by Prof. Vladimir Khavinson at the St. Petersburg Institute of Bioregulation and Gerontology in the 1980s as a… **Lowest listed price:** $34.99 across 4 listings Full Epithalon profile (https://www.bodyhackguide.co/compound/epithalon) ## Side-by-side comparison | Attribute | L-Tryptophan | Epithalon | | --- | --- | --- | | Category | Nootropic | Longevity & Cellular Health | | Research Stage | Preclinical | Preclinical (Western standards); Used clinically in Russian gerontological medicine | | Mechanism of Action | L-Tryptophan acts primarily as the upstream precursor to serotonin, melatonin, and — via the dominant kynurenine pathway — NAD+ and a family of bioactive metabolites. Its pharmacology is metabolism-driven: tryptophan itself has no direct receptor binding of… | Epithalon (AEDG; Ala-Glu-Asp-Gly) is a synthetic tetrapeptide modeled on the pineal polypeptide preparation epithalamin. Its proposed mechanism spans several parallel pathways. The human-relevant evidence is strongest for melatonin/circadian effects; the… | | Half-Life | — | Not well characterized in humans. As a small tetrapeptide, AEDG is expected to have a very short plasma half-life (on the order of minutes), while downstream gene-expression and circadian effects are thought to persist considerably longer. Any specific half-life figure should be treated as an unvalidated estimate. | | Typical Dose Range | — | 5000-10000 mcg (5-10 mg) subcutaneous daily for 10-20 day cycles; typically repeated 1-2 times per year in anti-aging protocols | | Dosing Frequency | — | Once daily for 10–20 day cycles | | Administration | — | Subcutaneous | | Side Effects | L-Tryptophan has a generally favorable side effect profile at standard doses in quality-sourced product, but several considerations — particularly serotonin syndrome risk and the 1989 EMS legacy — warrant specific attention. Gastrointestinal effects — the most… | Expected / benign - Mild injection-site reaction — redness, slight tenderness, occasional small bruise. Resolves within 24-48 hours. - Enhanced, more vivid dreams in the first week of a cycle — consistent with melatonin rise. - Deeper sleep onset and feeling… | | Molecular Weight | — | 390.3 Da | | Common Vial Sizes | — | 10mg, 50mg | ## Price History 3 data points - Half Nattys - Disguised Alpha - LB ### L-Tryptophan: potential benefits - No structured benefit list published. ### Epithalon: potential benefits - Telomerase activation and telomere elongation (human cell culture) - Normalization of circadian melatonin rhythm (human data from epithalamin, the parent pineal preparation) - Improved sleep consolidation and circadian regularity (subjective) - Modest life-span effects in rodents (mainly maximum / late-survivor lifespan; no change in mean lifespan) - Reduced incidence of specific tumors (e.g. ~6-fold fewer leukemias in SHR mice); no change in total tumor incidence - Reduced chromosomal aberrations in aged rodent tissue - Site-specific DNA / chromatin binding (proposed epigenetic modulation) - Association with lower mortality in an elderly cardiovascular cohort (epithalamin RCT, Korkushko 2011) ## Frequently asked ### What's the difference between L-Tryptophan and Epithalon? L-Tryptophan is a nootropic that l-tryptophan acts primarily as the upstream precursor to serotonin, melatonin, and — via the dominant kynurenine pathway — nad+ and a family of bioactive metabolites. its…. Epithalon is a longevity & cellular health that epithalon (aedg; ala-glu-asp-gly) is a synthetic tetrapeptide modeled on the pineal polypeptide preparation epithalamin. its proposed mechanism spans several parallel pathways. the…. The two differ in mechanism, half-life (not reported vs Not well characterized in humans. As a small tetrapeptide, AEDG is expected to have a very short plasma half-life (on the order of minutes), while downstream gene-expression and circadian effects are thought to persist considerably longer. Any specific half-life figure should be treated as an unvalidated estimate.), and typical dose range. ### Which has the longer half-life, L-Tryptophan or Epithalon? L-Tryptophan has a half-life of not reported. Epithalon has a half-life of Not well characterized in humans. As a small tetrapeptide, AEDG is expected to have a very short plasma half-life (on the order of minutes), while downstream gene-expression and circadian effects are thought to persist considerably longer. Any specific half-life figure should be treated as an unvalidated estimate.. Longer half-lives generally mean less frequent dosing but slower on/off kinetics. ### Can you stack L-Tryptophan and Epithalon? Stacking depends on mechanism overlap, safety profile, and goals. L-Tryptophan and Epithalon should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds. ## See current vendor prices Listings from the vendors we track. Prices change often, so check the vendor before you buy. L-Tryptophan prices: https://www.bodyhackguide.co/compound/l-tryptophan?tab=prices Epithalon prices: https://www.bodyhackguide.co/compound/epithalon?tab=prices Compare all compounds: https://www.bodyhackguide.co/compare ### Before you buy L-Tryptophan or Epithalon Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor. View Vendor Scorecard (https://www.bodyhackguide.co/vendors/scorecard) ## Related comparisons Pinealon vs Epithalon: https://www.bodyhackguide.co/compare/pinealon-vs-epithalon **Research use only.** BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. See editorial standards (https://www.bodyhackguide.co/editorial-standards) and affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). 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