Compare · Head-to-head
Thymosin Beta-1 vs Thymosin Beta-4.
Evidence, risk, regulatory flags, cost, and vendor coverage compared side by side. We don’t sell peptides — we help you choose between them.
Which should you research first?
Start with Thymosin Beta-4, then use the table to confirm fit.
Thymosin Beta-4 is the cleaner first read based on the current evidence, risk, and regulatory data stored for this pair. The right answer can still change if your goal, sport testing status, vendor constraints, or monitoring tolerance makes the other option a better fit.
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01· Subject
Thymosin Beta-1
Less-studied thymosin-family peptide discussed for immune modulation with sparse human evidence.
01 · At a glance
| Decision factor | Thymosin Beta-1 | Thymosin Beta-4 |
|---|---|---|
| Primary fit | tissue repair & recovery and immune support comparisons | tissue repair & recovery and immune support comparisons |
| Evidence | Tier C | Tier B-C |
| Risk | medium | med-high |
| Experience level | advanced | intermediate |
| Budget tier | mid | mid |
| Administration route | subcutaneous, intramuscular | topical, subcutaneous |
02 · Use case & timing
| Decision factor | Thymosin Beta-1 | Thymosin Beta-4 |
|---|---|---|
| Goal fit | Tissue Repair & Recovery, Immune Support | Tissue Repair & Recovery, Immune Support |
| What users compare it for | Theoretical immune-support and inflammatory-modulation effects only. | Ophthalmic: improved corneal epithelial healing. Systemic: wound healing signals in preclinical models. |
| Onset timeline | Unknown; immune-signaling outcomes would be expected over days to weeks if present. | Corneal healing studies: days to weeks; systemic repair claims are less well-timed. |
| Main tradeoff | Evidence and product availability can still be uneven, so documentation matters more than hype. | Evidence and product availability can still be uneven, so documentation matters more than hype. |
03 · Safety & restrictions
| Decision factor | Thymosin Beta-1 | Thymosin Beta-4 |
|---|---|---|
| Adverse effects | Sparse formal safety data; injection reactions and unpredictable immune signaling remain the main practical concerns. | Human ophthalmic safety reported as acceptable in trials; systemic safety requires caution. |
| Contraindications | Use caution in autoimmune disease or where immune stimulation is undesirable. | Limited formal contraindication data. |
| Interaction notes | No clear interaction data; avoid confident multi-immune stack claims. | Limited formal interaction studies; treat as unknown outside studied settings. |
| Regulatory status | Not approved | Investigational |
| FDA flag | FDA status unclear | FDA compounding caution |
| WADA status | Not listed | WADA S2 |
04 · Age & monitoring
| Decision factor | Thymosin Beta-1 | Thymosin Beta-4 |
|---|---|---|
| Supported age ranges | No age guidance yet | No age guidance yet |
| Life-stage note | Not yet documented | Not yet documented |
| Monitoring burden | Not specified | Not specified |
| Follow-up cadence | Not yet documented | Not yet documented |
05 · Cost & sourcing
| Decision factor | Thymosin Beta-1 | Thymosin Beta-4 |
|---|---|---|
| Typical cycle cost | No reliable estimate yet | $192.00 |
| Estimated monthly cost | No reliable estimate yet | $96.00 |
| Cost confidence | No estimate | High confidence |
06 · Before you buy
| Decision factor | Thymosin Beta-1 | Thymosin Beta-4 |
|---|---|---|
| Tracked vendor listings | 0 listings | 1 listing |
| Sourcing note | No tracked product page yet, so sourcing takes more manual review. | Product format varies by listing, so double-check route, concentration, and presentation. |
| Stack-friendly? | Usually stack-friendly | Usually stack-friendly |
Sources and review notes
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks - U.S. Food and Drug Administration - accessed 2026-05-15
Used for FDA compounding-risk context and peptide safety flags.
- The Prohibited List - World Anti-Doping Agency - accessed 2026-05-15
Used for athlete-facing WADA risk and peptide-class restrictions.
- Peptide therapeutics: current status and future directions - PubMed / Nature Reviews Drug Discovery - accessed 2026-05-15
Used for broad peptide-therapeutics background and evidence framing.
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