Epitalon vs thymalin: evidence, cost, and legality

Which is better, epitalon or thymalin?

Neither has evidence to support clinical use and neither can currently be lawfully compounded; epitalon has a pending PCAC recommendation, which is advisory. Epitalon is a synthetic, defined tetrapeptide, whereas thymalin is a bovine tissue extract of undefined composition with no US nomination. Thymalin's evidence edge (human observational versus animal only) rests on open, non-randomized reports from the developing institute, including the same 2003 elderly cohort study that is cited for Epithalamin. [2] [3] [6] [7] [8]

How do epitalon and thymalin compare?

Epitalon and Thymalin compared by dimension
Dimension	Epitalon	Thymalin
Evidence grade [1] [2] [3] [6]	Animal only. Telomerase activation in human cell lines and a lifelong mouse study; human reports mostly used the pineal extract Epithalamin, not synthetic epitalon.	Human observational. Open, non-randomized reports in elderly patients and a small open COVID-19 study; no randomized trial or independent replication.
Note: Both grades rest largely on work from the developing institute.
What it is [1] [5]	A synthetic tetrapeptide (Ala-Glu-Asp-Gly) with a defined structure, modeled on a bovine pineal extract.	A mixture of low molecular weight peptides extracted from calf thymus, registered as a drug in Russia.
Note: A defined molecule can be tested for identity and purity; an extract of undefined composition cannot be fully characterized.
Proposed mechanism [1] [4] [5]	Induces telomerase (hTERT) expression and lengthens telomeres in human cell lines; proposed effects on gene expression and melatonin rhythm.	Short thymic peptides proposed to promote T lymphocyte maturation; activated hematopoietic stem cell differentiation in culture.
Main claimed use [2] [3] [6]	Aging and longevity: in female SHR mice it extended life span of the longest lived 10% and reduced spontaneous tumors, without changing mean life span.	Immune support: reported fewer infections in elderly patients and faster normalization of inflammatory markers in hospitalized COVID-19 patients.
Safety concerns [2] [3]	No systematic human safety data; theoretical concern that telomerase activation could support existing tumors, although mice had fewer tumors.	No systematic safety data; allergy to bovine protein and theoretical prion or adventitious agent risk from unverified thymus products.
FDA and compounding status [7] [8]	Not FDA approved. Removed from the 503A Category 2 list on April 15, 2026; PCAC recommended adding it to the 503A bulks list on July 23 to 24, 2026; no final FDA rule at verification.	Not FDA approved and not identified on any 503A nomination list or PCAC agenda; as an undefined tissue extract it is not a 503A bulk candidate.
WADA status [9]	Prohibited at all times under S0 (non-approved substances).	Unclear; not named on the list. Athletes should confirm with their anti-doping organization.
Access and cost [7] [8]	No lawful compounded channel today: PCAC recommended it for the 503A bulks list in July 2026, but the recommendation is advisory and FDA has not published a final rule.	No lawful US channel. Prescription drug in Russia and some neighboring countries only.
Human dosing data [2] [3]	Not established. Mouse studies used 0.1 ug per mouse in monthly courses; Russian human reports used 10 mg intramuscular courses of the extract Epithalamin.	Not established in indexed literature; Russian labeling describes intramuscular courses with no published dose finding trial.

Evidence grade and regulatory status

Pulled from each peptide’s own record, so it stays in step with the peptide pages.

Epitalon and Thymalin: grade, status, and cost
Attribute	Epitalon	Thymalin
Class	Synthetic tetrapeptide (Ala-Glu-Asp-Gly) modeled on the bovine pineal extract Epithalamin	Polypeptide extract from calf thymus (a mixture of low molecular weight peptides), registered as a drug in Russia
What it is	4 amino acid peptide from a pineal gland extract: telomere and lifespan data in cells and mice, small non-randomized Russian human reports, not FDA approved.	A Russian calf thymus peptide extract used to adjust the immune system, with decades of non-randomized Russian reports and no FDA review.
Evidence	Evidence: Animal-only evidence	Evidence: Human observational evidence
FDA status	Regulatory: Under FDA review	Regulatory: Unscheduled
Compounding	Epitalon was placed on the FDA 503A Category 2 list (substances with significant safety risks) in 2023 and removed from it on April 15, 2026. On July 23 to 24, 2026 the Pharmacy Compounding Advisory Committee recommended adding epitalon to the 503A bulks list. As of the last verification date FDA has not published a final rule, so compounding pharmacies and state boards vary in whether they will fill it. It is not an FDA approved drug and is not eligible for 503B outsourcing.	Thymalin is not an FDA approved drug and PeptideAgent has not identified it on the FDA 503A bulks nomination lists or in any Pharmacy Compounding Advisory Committee review. As an animal tissue extract of undefined composition it is not a candidate for 503A bulk compounding, and it is not eligible for 503B outsourcing. It is registered as a prescription drug in Russia and some neighboring countries. Products sold in the United States under this name are not lawful for human use.
WADA	WADA: WADA prohibited	WADA: WADA status unclear
Routes	Subcutaneous injection (as sold), Intramuscular injection (Russian Epithalamin reports), Intranasal and oral products exist without absorption data	Intramuscular injection (Russian labeling and reports), Subcutaneous injection (as sold)
Typical cost	No lawful compounded price: Epitalon is not on the 503A bulks list, and PCAC's July 2026 recommendation is advisory until FDA publishes a final rule. Advertised clinic prices are not a comparable price. Products sold as research chemicals are not lawful for human use and are not verified for identity or purity.	Not available through licensed US channels. Products sold as research chemicals are not lawful for human use and are not verified for identity or purity.
Last verified	Sep 22, 2026	Sep 22, 2026

Has epitalon been tested directly against thymalin?

No published trial has compared epitalon and thymalin directly. The dimensions above come from separate studies and labels, and cross-trial comparisons are less reliable than a direct trial.

What do epitalon and thymalin cost?

Typical cost of Epitalon and Thymalin
Dimension	Epitalon	Thymalin
Typical cost	No lawful compounded price: Epitalon is not on the 503A bulks list, and PCAC's July 2026 recommendation is advisory until FDA publishes a final rule. Advertised clinic prices are not a comparable price. Products sold as research chemicals are not lawful for human use and are not verified for identity or purity.	Not available through licensed US channels. Products sold as research chemicals are not lawful for human use and are not verified for identity or purity.
Price detail	Epitalon price by channel	Price index in progress

Where a price index exists, the range is the cash price per month across branded, compounded, and telehealth channels, without insurance. The cost pages give each channel separately with its sources. Otherwise the typical cost from the peptide record is shown. Legal access depends on your state: see peptide legality by state.

Frequently asked questions

Is there any study comparing epitalon and thymalin directly?

No study compares synthetic epitalon with thymalin. The 2003 Khavinson and Morozov report followed elderly patients given Thymalin, the pineal extract Epithalamin, or both, but it was open and non-randomized, came from the developing institute, and used the extract rather than synthetic epitalon. [3]

Can I get either one legally in the United States?

Not today. Epitalon came off FDA Category 2 and PCAC recommended it for the 503A bulks list in 2026, but the recommendation is advisory and FDA had not issued a final rule at verification, so a 503A pharmacy has no federal basis to compound it from bulk. Thymalin has no lawful US route. [7] [8]

Does epitalon lengthen telomeres in people?

That has not been shown. Telomerase activation and telomere elongation were documented in cultured human cell lines, and the lifespan data come from mice. No human study has measured telomere length after synthetic epitalon. [1] [2] [4]

Does thymalin boost the immune system?

Russian reports describe fewer infections in elderly patients and faster normalization of inflammatory markers in COVID-19 patients, and a cell study showed stem cell differentiation, but none of this was randomized or independently replicated. [3] [5] [6]

Are they banned in sport?

Epitalon is prohibited at all times under WADA section S0 as a non-approved substance. Thymalin is not named on the list, so its status is unclear; tested athletes should check with their anti-doping organization before using any unapproved peptide. [9]

Conditions studied

From the blog

Epitalon human studies: what the small cohorts actually measured
Most epitalon human data come from one research group and used the pineal extract Epithalamin, not synthetic epitalon. What each study measured, plus the melatonin, telomerase, and cancer questions.

Sources

Numbered citations above point to these primary sources. PubMed entries link to the indexed abstract.

Cite this page

Free to cite and quote with a link. Data is licensed CC BY 4.0 with attribution to PeptideAgent.

APA style: PeptideAgent. (2026, September 22). Epitalon vs thymalin: evidence, cost, and legality. https://peptideagent.ai/compare/epitalon-vs-thymalin
HTML link: <a href="https://peptideagent.ai/compare/epitalon-vs-thymalin">Epitalon vs thymalin: evidence, cost, and legality</a>, PeptideAgent, updated September 22, 2026.

Epitalon vs thymalin

The short answer