L-Tryptophan vs Epithalon
Side-by-side comparison of L-Tryptophan and Epithalon: mechanism, half-life, dose range, safety profile, and vendor pricing.
Price snapshot
L-Tryptophan
Epithalon
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 profileEpithalon
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 profileSide-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.
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Related comparisons
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