Vendor comparison · 2026
Thymalin vendors: 3 compared on COAs and price
Tissue & recoveryEvidence tier
Substantial published literature
234 publications over 45 years · trials not yet curated
- Vendors carrying it
- 3
- 2 with a listed price
- Vendors with checkable COAs
- 1
- 1 publish any certificate
- Lots tested
- 1
- 1 naming a checkable lab
- Independent assays
- 0
- none on file yet
- Newest assay
- 16 Jul 2026
- oldest 16 Jul 2026
- Laboratories named
- 1
- most often Freedom Diagnostics Testing
- Median label gap
- 0.5%
- 100% of lots within 5% of label
- Median purity
- 99.95%
- 1 of 1 lots at 99% or above
- Lowest price per mg
- $2.40
- peer median $3.48
- Publications located
- 234
- researched since 1981
Source: PepIndex, an independent index of research-peptide vendors. No vendor can pay for a rank, every score is computed by a published formula, and every figure links to the document it was read from.
PeptidePlugs has the most checkable Thymalin testing in this index: 1 lot assayed by Freedom Diagnostics Testing, the newest on 16 Jul 2026. The lowest listed price is $2.40 per mg at Eternal Peptides, against a peer median of $3.48. 3 vendors carrying Thymalin are compared below. 1 publish at least one certificate naming a checkable laboratory, 1 lot record is on file, and none is an independently commissioned assay. Figures are PepIndex's own: it is an independent index of research-peptide vendors, no vendor can pay for a rank, and each figure links to the certificate it was read from.
Every vendor carrying Thymalin
| # | Vendor | Score here | Price / mg | Lots | Newest test | Laboratory | Mean purity | Label gap | Reports |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PeptidePlugs | 87.694% | — | 1 / 1 | Freedom Diagnostics Testing | 100.0% | 0.5% | ||
| 2 | Eternal Peptides | 68.263% | $2.40 (69%) | 0 | — | — | — | — | no reportVisit site |
| 3 | Biotech Peptides | 55.960% | $4.56 (131%) | 0 | — | — | — | — | no reportVisit site |
Independent assays
No independently commissioned assay of Thymalin is on file. All 1 records below were published by the vendor that sells the product, naming the laboratory shown. PepIndex does not yet commission its own assays, so nothing on this page establishes what is in a vial beyond the vendor’s own certificate. A record moves into this section the moment an assay commissioned by anyone other than the seller is indexed.
What the certificates show
1 of 1 lots at 99% or above; median 99.95%.
| Range | lots |
|---|---|
| <95% | 0 |
| 95–97% | 0 |
| 97–98% | 0 |
| 98–99% | 0 |
| 99–99.5% | 0 |
| ≥99.5% | 1 |
100% of lots within 5% of the labelled mass; median gap 0.5%.
| Range | lots |
|---|---|
| ≤2% | 1 |
| 2–5% | 0 |
| 5–10% | 0 |
| 10–20% | 0 |
| >20% | 0 |
2 vendors, $2.40 to $4.56; median $3.48.
| Range | vendors |
|---|---|
| $2.00–$2.50 | 1 |
| $2.50–$3.00 | 0 |
| $3.00–$3.50 | 0 |
| $3.50–$4.00 | 0 |
| $4.00–$4.50 | 0 |
| $4.50–$5.00 | 1 |
Purity and mass are read from each certificate as published; the label gap is |labeled − assayed| ÷ labeled. Every value behind these bars is in the certificate table below.
Laboratories used
| Laboratory | Lots | Vendors | Share | Verify |
|---|---|---|---|---|
| Freedom Diagnostics TestingUS | 1 | 1 | 100% | Public lookup |
Every certificate record
| Vendor | Lot | Tested | Lab | Labeled | Assayed | Discrepancy | Purity | Report |
|---|---|---|---|---|---|---|---|---|
 PeptidePlugs | 101-10-ZB | Freedom Diagnostics Testing | 20 mg | 20.1 mg | 0.5% | 100.0% | Vendor-published |
Score breakdown
The score has two halves: the research base — how long the compound has been studied and how much has been published — and the quality of the evidence the market produces for it, aggregated across every vendor that carries it: assayed purity, lot-to-lot consistency, readable third-party certificates and those vendors’ review record. It measures the evidence base, not the merits or safety of the substance.
Studied since 1981 — 45 years of published research
How long the compound has been studied. Fifteen years or more of published literature earns full marks; a newer compound earns less.
234 publications indexed in PubMed
The volume of published literature located. Full marks at fifty or more publications.
Mean assayed purity 100.0% across 1 certificate
Average assayed purity on the certificates published by vendors that carry this compound. Full marks at 99.5%+, nothing at 95% or below.
single lot on record, mean label deviation 0.5%
How tightly assayed purity and labeled-versus-actual mass hold across different lots. Rewards reproducible manufacturing.
3 of 3 listing vendors publish an accessible certificate policy
Whether the vendors carrying this compound publish per-lot certificates anyone can read without an account.
1 of 1 certificate from a recognised independent lab
Share of certificates issued by a recognised third-party testing lab rather than an unnamed or self-named one.
What is Thymalin?
A polypeptide preparation extracted from thymus tissue, studied for immunomodulatory effects. It has clinical use in some countries but is not approved in the United States.
Studied in published research for immune modulation.
Regulatory status
Thymalin is approved as a medicine in some countries but not in the United States. Products listed here are labeled by their vendors for laboratory research use only, and nothing here is medical advice.
What the research examines
The areas of published research this compound appears in. These describe what the literature has studied — never a claim of benefit, effect or suitability for any use.
Published research
PepIndex records the size and shape of the published research footprint only. It does not evaluate or summarise clinical significance, does not describe administration, and nothing here is a claim of safety or efficacy.
- Peptides and Ageing — Neuro endocrinology letters (2002)
Peer-reviewed article indexed in PubMed, published in Neuro endocrinology letters (2002).
- Thymalin: Activation of Differentiation of Human Hematopoietic Stem Cells — Bulletin of experimental biology and medicine (2020)
Peer-reviewed article indexed in PubMed, published in Bulletin of experimental biology and medicine (2020).
- [Geroprotective effect of thymalin and epithalamin] — Advances in gerontology = Uspekhi gerontologii (2002)
Peer-reviewed article indexed in PubMed, published in Advances in gerontology = Uspekhi gerontologii (2002).
- The Influence of KE and EW Dipeptides in the Composition of the Thymalin Drug on Gene Expression and Protein Synthesis Involved in the Pathogenesis of COVID-19 — International journal of molecular sciences (2023)
Peer-reviewed article indexed in PubMed, published in International journal of molecular sciences (2023).
- [Influence of peptides from pineal gland on thymus function at aging] — Advances in gerontology = Uspekhi gerontologii (2010)
Peer-reviewed article indexed in PubMed, published in Advances in gerontology = Uspekhi gerontologii (2010).
- Chornobyl catastrophe: cytogenetic effects of low dose ionizing radiation and their modification — Experimental oncology (2016)
Peer-reviewed article indexed in PubMed, published in Experimental oncology (2016).
PepIndex describes what literature exists. We do not interpret it, assess clinical significance, or publish quantities, protocols or instructions for use.