Glutathione vs LL-37
Which should you choose? Here's what you need to know.
The short answer
Glutathione and LL-37 are both immune / inflammation peptides, but they work differently. A tripeptide antioxidant naturally produced in cells. The body's master antioxidant, studied for immune support, detoxification, and skin brightening. The only human cathelicidin antimicrobial peptide. Plays a key role in innate immune defense against bacterial, viral, and fungal infections. Compare vendor pricing and availability below.
On 20 Sep 2026 Peptide Compare tracked 48 vendors selling Glutathione, cheapest in stock $0.025 per mg at Step One, and 39 selling LL-37, cheapest $5.40 per mg at Alpha Omega.
Glutathione
Immune / InflammationA tripeptide antioxidant naturally produced in cells. The body's master antioxidant, studied for immune support, detoxification, and skin brightening.
LL-37
Immune / InflammationThe only human cathelicidin antimicrobial peptide. Plays a key role in innate immune defense against bacterial, viral, and fungal infections.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options. Prices verified Sep 20, 2026.
Glutathione
LL-37
$19.00
Starting from
$34.99
$0.64
Avg. price per mg
$17.22
48
Vendors selling it
39
45 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.