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Side-by-side comparison

Thymosin Alpha-1

Cellular PeptideSafety 8/10

Immune-modulation research

vs

LL-37

Safety 6/10
Thymosin Alpha-1
LL-37
Cheapest price
$18.75 /5mg
$27.50 /5mg
Vendors stocking
18
12
Safety rating
8/10
6/10
Mol. weight
3,108.3 g/mol
—
Administration
Subcutaneous injection
Topical

Price Comparison — 2026

Thymosin Alpha-1

VendorPrice
Ascension Peptides$18.75 /5mgBuy →
Optimum Formula$20.25 /5mgBuy →
Hydro Research$26.00 /5mgBuy →
Amino Club$31.99 /5mgBuy →
Polar Peptides$32.40 /5mgBuy →
SomaChems$39.99 /5mgBuy →
+12 more vendors →

LL-37

VendorPrice
Ascension Peptides$27.50 /5mgBuy →
Peptira$39.00 /5mgBuy →
Pantheon Peptides$63.50 /5mgBuy →
SomaChems$63.99 /5mgBuy →
Modern Aminos$64.00 /5mgBuy →
Biotech Peptides$86.00 /5mgBuy →
+6 more vendors →

Vendors Carrying Both

11 vendors stock both Thymosin Alpha-1 and LL-37 — convenient if you want to bundle an order.

Ascension PeptidesThymosin Alpha-1: $18.75LL-37: $27.50Visit →
PeptiraThymosin Alpha-1: $59.00LL-37: $39.00Visit →
Pantheon PeptidesThymosin Alpha-1: $48.60LL-37: $63.50Visit →
SomaChemsThymosin Alpha-1: $39.99LL-37: $63.99Visit →
Modern AminosThymosin Alpha-1: $44.00LL-37: $64.00Visit →
Biotech PeptidesThymosin Alpha-1: $65.00LL-37: $86.00Visit →
Polar PeptidesThymosin Alpha-1: $32.40LL-37: $86.39Visit →
Core PeptidesThymosin Alpha-1: $74.50LL-37: $89.00Visit →
LeoLab RxThymosin Alpha-1: $60.00LL-37: $90.00Visit →
PeptuviaThymosin Alpha-1: $147.50LL-37: $91.00Visit →
BioLongevity LabsThymosin Alpha-1: $64.98LL-37: $94.97Visit →

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

LL-37

FDA: Not FDA-approved

Endogenous cathelicidin; naturally occurring; potential pro-inflammatory at very high doses only

Explore Further

Thymosin Alpha-1

Full profile →Cheapest deals →

LL-37

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