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Side-by-side comparison

Thymosin Alpha-1 vs TB-500 — Price & Profile Comparison

Thymosin Alpha-1

Cellular PeptideSafety 8/10

Immune-modulation research

vs

TB-500

Cellular PeptideSafety 6/10

Tissue repair research

Thymosin Alpha-1
TB-500
Cheapest price
$37.50 /10mg
$28.19 /10mg
Vendors stocking
24
29
Safety rating
8/10
6/10
Mol. weight
3,108.3 g/mol
4,963 Da
Administration
Subcutaneous injection
Subcutaneous injection

The short answer

Thymosin Alpha-1 vs TB-500: which to choose

TB-500 is the cheaper option — roughly $28 vs $38 for the lowest verified listing. TB-500 is the more widely stocked of the two (29 vendors vs 24). Thymosin Alpha-1 carries the higher safety rating (8/10 vs 6/10). Both are cellular peptide compounds, so the decision usually comes down to price, evidence, and tolerability rather than use case.

Price Comparison — 2026

Thymosin Alpha-1

VendorPrice
Ascension Peptides$37.50 /10mgBuy →
Optimum Formula$40.49 /10mgBuy →
Hydro Research$52.00 /10mgBuy →
Glacier Aminos$57.59 /10mgBuy →
GLP-1 Research Lab$60.00 /10mgBuy →
Amino Club$63.98 /10mgBuy →
+18 more vendors →

TB-500

VendorPrice
Alpha Peptides$28.19 /10mgBuy →
Woosh Labs$35.99 /10mgBuy →
Averix Labs$35.99 /10mgBuy →
Midwest Peptide$44.99 /10mgBuy →
Ascension Peptides$50.00 /10mgBuy →
Glacier Aminos$53.09 /10mgBuy →
+23 more vendors →

Vendors Carrying Both

17 vendors stock both Thymosin Alpha-1 and TB-500 — convenient if you want to bundle an order.

Woosh LabsThymosin Alpha-1: $89.99TB-500: $35.99Visit →
Ascension PeptidesThymosin Alpha-1: $37.50TB-500: $50.00Visit →
Glacier AminosThymosin Alpha-1: $57.59TB-500: $53.09Visit →
Apex Peptide SupplyThymosin Alpha-1: $89.99TB-500: $59.99Visit →
Amino ClubThymosin Alpha-1: $63.98TB-500: $63.98Visit →
Optima SupplyThymosin Alpha-1: $65.00TB-500: $65.00Visit →
GLP-1 Research LabThymosin Alpha-1: $60.00TB-500: $70.00Visit →
Polar PeptidesThymosin Alpha-1: $64.79TB-500: $70.19Visit →
SomaChemsThymosin Alpha-1: $79.98TB-500: $71.98Visit →
Hydro ResearchThymosin Alpha-1: $52.00TB-500: $72.00Visit →
Modern AminosThymosin Alpha-1: $88.00TB-500: $76.00Visit →
CertaPeptidesThymosin Alpha-1: $99.95TB-500: $83.81Visit →
Pinnacle Peptide LabsThymosin Alpha-1: $93.49TB-500: $84.98Visit →
Liv Pure WellnessThymosin Alpha-1: $110.00TB-500: $110.00Visit →
Core PeptidesThymosin Alpha-1: $149.00TB-500: $140.00Visit →
LeoLab RxThymosin Alpha-1: $120.00TB-500: $160.00Visit →
BioLongevity LabsThymosin Alpha-1: $129.97TB-500: $164.97Visit →

Safety Notes

Thymosin Alpha-1

FDA: Approved in 30+ countries

11,000+ patients in 30+ trials; well-tolerated; approved as Zadaxin globally; excellent safety record

TB-500

FDA: Not FDA-approved

Parent protein TB4 has Phase II data; fragment widely used anecdotally; proangiogenic concern theoretical

Explore Further

Thymosin Alpha-1

Full profile →Cheapest deals →

TB-500

Full profile →Cheapest deals →
All current deals →Browse all peptides →
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