KLOW vs Thymosin Alpha-1
Which should you choose? Here's what you need to know.
The short answer
KLOW and Thymosin Alpha-1 are both immune / inflammation peptides, but they work differently. A multi-peptide blend sold for gut and immune support. Composition varies between vendors — check the COA before comparing prices. A thymic peptide that modulates immune function. FDA-orphan drug approved and used clinically in many countries for immune support. Compare vendor pricing and availability below.
On 19 Sep 2026 Peptide Compare tracked 44 vendors selling KLOW, cheapest in stock $0.875 per mg at Modern Research, and 37 selling Thymosin Alpha-1, cheapest $3.85 per mg at Step One.
KLOW
Immune / InflammationA multi-peptide blend sold for gut and immune support. Composition varies between vendors — check the COA before comparing prices.
Thymosin Alpha-1
Immune / InflammationA thymic peptide that modulates immune function. FDA-orphan drug approved and used clinically in many countries for immune support.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options. Prices verified Sep 19, 2026.
KLOW
Thymosin Alpha-1
$69.99
Starting from
$37.00
$7.16
Avg. price per mg
$8.69
44
Vendors selling it
37
46 options
In stock now
38 options
9.1/10
Top trust score
9.0/10
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Where does this data come from?
We re-check vendor prices continuously and score vendors on Finnrick blind-test results — samples bought anonymously and sent to a lab, not vendor claims. No vendor can pay to rank higher. See our full methodology.