A statement that one preparation is hundreds of times stronger than another sounds precise. It may instead combine a ratio of amounts used, a result from one animal model and an assumption that the two materials are interchangeable. Epithalon and Epithalamin illustrate why the endpoint and identity must be inspected before a numerical comparison is repeated.
The comparison starts with two different kinds of material
Kozina and colleagues’ 2007 report distinguishes the polypeptide preparation Epithalamin from Epitalon, the defined sequence Ala–Glu–Asp–Gly. Its experiments examined antioxidant-related measurements in old rats.Kozina and colleagues — Antioxidant properties of pineal preparations (opens in a new tab)
The preparation and the tetrapeptide therefore need separate identity entries. A mass of complex material is not automatically a known mass of one particular constituent.
A comparison by total mass can still be an experimental description, but it cannot reveal the number of molecules of an unspecified active constituent. That missing compositional information must not be supplied by arithmetic.
| Ratio | What must be known |
|---|---|
| Amounts used | The stated mass or molar basis |
| Potency for an endpoint | Comparable response curves and a defined response level |
| Composition of a preparation | Measured amounts of its relevant constituents |
A shared direction of change is not a full potency curve
Goncharova and colleagues’ 2003 report studied pineal function in 38 female rhesus macaques across younger and older age groups. Both named preparations were associated with increased night-time plasma melatonin in older animals under the tested programmes, while the younger group did not show that change.Goncharova and colleagues — Pineal preparations in ageing monkeys (opens in a new tab)
The abstract describes different administered amounts and programmes. It does not provide a matched set of concentration–response curves establishing a universal relative potency.Goncharova and colleagues — Pineal preparations in ageing monkeys (opens in a new tab)
Dividing the two stated amounts would calculate their amount ratio. It would not establish that both produced the same response magnitude, that the comparison was on the same part of a response curve, or that their maxima were equal.
Nor would a melatonin concentration comparison establish equivalent sleep outcomes or longevity. The outcome named in the comparison must remain the outcome actually measured.
A striking numerical claim still needs an identity check
A 2000 Drosophila paper’s abstract reports a thousand-fold activity comparison with Epithalamin in the context of catalase and hydroperoxide measurements. However, its displayed sequence ends in Glu rather than the Gly in AEDG; both PubMed and the publisher abstract show that discrepancy.Khavinson and Myl’nikov — Pineal tetrapeptide and Drosophila antioxidant defence (opens in a new tab)
The discrepancy is retained here rather than silently corrected. Without resolving the original material description, that abstract is a poor foundation for a precise equivalence claim about a specified AEDG preparation.
Even a corrected identity would not turn a fly antioxidant endpoint into a universal multiplier. A ratio is interpretable only with the measurement, response level and experimental conditions that produced it.
Write a comparison that the evidence can support
A bounded account can say that the two preparations were examined in a named model and report the specific outcome. It should identify whether the evidence is a direct experiment, a comparison across papers or an unresolved abstract-level claim.
Avoid assigning all activity of a complex preparation to the tetrapeptide merely because the latter was developed from related research. That attribution requires experiments separating constituent effects.
The comparison here concerns how to interpret the published claims. It provides no administration conversion and does not rank either preparation for human use.
Sources and further detail
- Kozina and colleagues — Antioxidant properties of pineal preparations (opens in a new tab)
Complete original 2007 abstract read. Preparation identity and rat measurements retained without adopting broader geroprotection claims.
- Goncharova and colleagues — Pineal preparations in ageing monkeys (opens in a new tab)
Complete English abstract of the 2003 Russian-language original read. Total cohort, age-dependent observation and differing programmes checked; no claim of full-text assessment.
- Khavinson and Myl’nikov — Pineal tetrapeptide and Drosophila antioxidant defence (opens in a new tab)
Publisher abstract cross-checked against PubMed 10977918. Both print an AEDE sequence; the discrepancy with AEDG remains unresolved. Numerical claim is discussed critically, not adopted as a conversion factor.
Sources checked 19–20 September 2026. Worked examples are illustrative unless a supplied report is explicitly identified. This article has not undergone independent scientific peer review.