Research-context information only. Thymosin alpha-1 is a research peptide. It is approved as a finished pharmaceutical product in 35+ countries (e.g., as an internationally approved branded product for chronic hepatitis B), but is not FDA-approved in the United States. Protocols, doses, and reactions reported below come from published research and self-reported community sources. This article reports what has been documented, not what should be done. Consult a licensed physician for personal medical decisions.
The buying problem with TA-1 is straightforward: it's a longer peptide than most (28 residues vs 5-10 for typical research peptides), N-terminal acetylation is required for bioactivity, and synthesis cost runs higher. Cheap "TA-1" labeled vials priced like sermorelin almost always lack the acetylation or are different peptides entirely.
This guide covers documented per-mg pricing, how to verify a TA-1 COA, which vial size matches typical protocols, and red flags. For dosing itself, see the thymosin alpha-1 dosing guide.
TA-1 ships as a lyophilized powder in sealed glass vials. Three factors drive price: vial size, vendor markup, and whether the COA confirms the N-acetylation alongside 98%+ HPLC purity.
Current Market Pricing (2026)
Vial Size
Typical Price Range
Price Per mg
Best For
2mg
$20-45
$10-22/mg
Tolerance testing only — worst value
5mg
$40-90
$8-18/mg
Short trial protocols
10mg
$70-160
$7-16/mg
Standard 1.6mg twice-weekly — best value
10mg × 5 (kit)
$300-700
$6-14/mg
Extended cycles
The pattern: 10mg vials are the most-cited size in community discussions. 2mg vials carry significantly higher per-mg cost — typically 30-50% more than 10mg.
Cheapest single-vial option: Ascension Peptides's 50% off drops the 10mg vial to $45.00 ($4.50/mg effective) — the lowest effective price we track for buying one vial. Get the code →
How to Verify Thymosin Alpha-1 Quality
TA-1 is a 28-amino-acid peptide with N-terminal acetylation (Ac-Ser-Asp-Ala-Ala-Val-Asp-Thr-Ser-Ser-Glu-Ile-Thr-Thr-Lys-Asp-Leu-Lys-Glu-Lys-Lys-Glu-Val-Val-Glu-Glu-Ala-Glu-Asn-OH). The N-acetyl group is what gives TA-1 its bioactivity profile — non-acetylated analogs (sometimes called "thymosin alpha-1 free acid") behave differently in receptor binding studies.
What a COA Should Include
Identity Confirmation
Mass spectrometry confirming 3,108 Da for TA-1 (acetylated form)
Non-acetylated TA-1 is 3,066 Da — a 42 Da difference visible on mass spec
Sequence verification — 28 residues matching the published TA-1 sequence
Purity Testing
HPLC purity at 98%+
Single dominant peak; secondary peaks indicate degradation or incomplete acetylation
TA-1 reconstituted with bacteriostatic water and refrigerated is documented stable for roughly 28 days in published peptide-stability data. With sterile water (no preservative), the window collapses to ~24 hours.
Vial Size
At 0.9 mg/day
At 1.6 mg 2×/week (3.2 mg/wk)
At 0.45 mg/day
2mg
2 days
4-5 days
4 days
5mg
5-6 days
~11 days
11 days
10mg
11 days
~22 days
22 days
All cells fall comfortably within the 28-day stability window for these protocols, meaning 10mg is the most efficient size aligned with standard use.
Vial Size by Protocol
Tolerance testing context:
A 5mg vial is the smallest unit cited for tolerance testing without significant per-mg waste
~11 days at the 1.6mg twice-weekly hep B trial protocol
Standard 1.6mg twice-weekly protocol:
10mg vial — lasts ~22 days, well within stability window
1-2 vials per month
The most-cited size in vendor sales data
Daily protocols (community variations):
10mg vial — 11 days at 0.9mg/day
Multiple vials per month — kit pricing can drop cost by 15-25%
Buying Multiple Smaller vs Kit
Factor
Multiple 10mg Singles
Kit (5× 10mg)
Cost per mg
Higher ($7-16/mg)
Lower ($6-14/mg)
Freshness
Same (lyophilized storage)
Same
Flexibility
Can stop mid-supply
Committed to full kit
Storage
Easier (smaller volumes)
Requires fridge space
Shipping
More frequent orders
Single shipment
Why Thymosin Alpha-1 Is Priced Higher Than Most Peptides
TA-1 runs $7-16/mg vs $2-5/mg for typical short research peptides. Three reasons:
1. 28-residue length. Solid-phase peptide synthesis cost scales roughly with chain length. TA-1 at 28 residues costs more to make than ipamorelin (5 residues) or BPC-157 (15 residues).
2. N-terminal acetylation. The acetyl group must be added in a separate synthesis step, increasing manufacturing complexity 15-25%.
3. Branded reference. Approved internationally as an internationally approved branded product at high prescription prices, the research market sustains higher pricing than would otherwise be supported by synthesis cost alone.
When TA-1 is paid for at premium prices but mass spec shows ~3,066 Da (non-acetylated form) or different mass entirely, the COA is the mechanism that surfaces this.
Vendor Evaluation Methodology
When comparing TA-1 vendors:
Price Competitiveness (40%)
Normalize to cost per milligram. 10mg vials at $90 ($9/mg) score higher than 5mg at $55 ($11/mg).
COA & Testing (30%)
Third-party labs (Janoshik, MZ Biolabs, Colmaric)
Recent (within 6 months)
Verifiable task number
Mass spec confirming 3,108 Da (acetylated form)
Reputation (30%)
Community feedback, shipping reliability, customer service, multi-year track record.
Shipping and Storage
Order Arrival
Lyophilized TA-1 typically arrives as a white or off-white powder cake:
Vial integrity — no cracks, intact rubber seal, aluminum cap secure
Powder appearance — solid cake or loose powder, NOT liquid or discolored
Labeling — batch/lot, mg content, "for research use only"
Cold pack — most reputable vendors include cold packs in summer
Niche-format vendor — oral capsule peptides, pre-mixed nasal solutions, and a rare Reta + Cagrilintide combo blend, all 25% off with code thepeptidecatalog.
Most cloudy reconstitutions trace back to one thing — and it isn't the peptide. Sterile, non-pyrogenic, 0.9% benzyl alcohol — formulated for peptide reconstitution, not repackaged from generic stock.
✓ 0.9% benzyl alcohol✓ Made for peptides✓ 30 mL multi-dose
30ml from $18.75 · Ships fast · Code thepeptidecatalog
Frequently Asked Questions
Is thymosin alpha-1 legal to buy?
Thymosin alpha-1 is sold as a research peptide labeled 'not for human consumption.' It is not FDA-approved in the United States, though it is approved as a finished pharmaceutical product in 35+ countries for chronic hepatitis B and as an immune adjuvant. Purchasing research peptides is legal in most US jurisdictions.
How much does thymosin alpha-1 cost per month?
At the chronic hepatitis B trial protocol of 1.6mg twice weekly, monthly use runs ~13mg. Research-vendor 5mg vials cost $40-90 and 10mg vials cost $70-160. Monthly cost ranges from $80-200 depending on vial size and protocol.
What vial size should I buy?
10mg vials are the most-cited size for cost efficiency. At 1.6mg twice weekly, a 10mg vial lasts ~3 weeks (within stability window). 5mg vials are more common for shorter cycles or tolerance testing.
What purity should I look for in thymosin alpha-1?
Third-party HPLC at 98%+ purity, plus mass spec confirming 3,108 Da. Thymosin alpha-1 is a 28-amino-acid peptide with N-terminal acetylation. The N-acetyl group must be confirmed — non-acetylated thymosin alpha-1 has different bioactivity and is sometimes substituted.
Why does thymosin alpha-1 cost more than other immune peptides?
TA-1 is a 28-residue peptide — longer than most research peptides — and the N-terminal acetylation step adds synthesis cost. Manufacturing complexity puts per-mg pricing at $7-16/mg vs $2-5/mg for shorter peptides. The branded product an internationally approved branded product (approved abroad) reinforces the higher reference price.
Can I get thymosin alpha-1 from a compounding pharmacy?
TA-1 was on FDA 503A Category 2 list as of 2024, meaning US compounding pharmacies cannot legally produce it. Some clinics still offered it through 2023, but legitimate compounding has tightened. Research vendors are the documented option for buyers in this category.
This article is for educational and informational purposes only. It is not medical advice and should not be used to diagnose, treat, or prevent any condition. Consult a licensed healthcare provider before using any peptide.
