Immune Peptides

Our immune peptides are the compounds studied for how the immune system responds and regulates itself: Thymosin Alpha-1, thymulin in 10mg and 100mg, the antimicrobial peptide LL-37 and the anti-inflammatory tripeptide KPV.

Looking for something else? See our healing and recovery peptides and anti-aging peptides, or browse all research peptides.

What are immune peptides?

Thymosin alpha-1 and thymulin both come from the thymus, the organ where T cells mature. Thymosin alpha-1 is a 28-amino-acid peptide, approved in some countries as thymalfasin. Thymulin is a nine-amino-acid hormone that only works when bound to zinc, and its levels fall with age.

LL-37 is the only cathelicidin antimicrobial peptide humans make. It kills microbes directly and also signals to immune cells. KPV is a small alpha-MSH fragment studied in colitis and skin inflammation models.

For the published research behind this range, start with this PubMed search.

Immune Peptides in our range

How to choose immune peptides

Choose by the side of immunity you’re studying. Thymosin alpha-1 and thymulin are the usual picks for T-cell work, LL-37 for antimicrobial and barrier models, and KPV for inflammation.

Thymulin comes in a 100mg vial as well as 10mg, which costs far less per milligram for long studies.

Immune peptides: formats and prices

There are 5 products in this range: five freeze-dried vials. Prices run from $40.00 to $185.00. One of them is on sale right now. Every product page lists the amount, the format and the SKU, so you can compare like for like before you order.

Purity and testing for our immune peptides

Every batch in this range is checked by HPLC-MS, which measures purity and confirms the molecular weight in one test. Most products test above 99% purity, and each product page states its figure. Vials are vacuum-sealed after freeze-drying to keep air and moisture out.

Store sealed vials in the freezer at -20°C and reconstitute with sterile bacteriostatic water when you’re ready. Every vial page lists the concentration you’ll get for each volume of water. Mixed vials go in the fridge at 2 to 8°C and should be used within 28 days.

Bulk pricing on immune peptides

Most products here come in packs as well as single vials. Pick 2, 5, 10, 15 or 20 in the Quantity menu on the product page, and the price per unit drops by 10% to 30%. Packs ship as individual sealed vials, so you only open what you need.

Immune peptides FAQ

Are your immune peptides in stock?

Yes. Everything listed here is in stock and ready to ship.

Are immune peptides for human use?

No. Everything we sell is for laboratory research only and isn’t approved for human or veterinary use.

How pure are they?

Most test above 99% by HPLC-MS. Each product page shows the purity figure for that product.

Is there a bulk discount?

Yes. Choose a pack of 2 to 20 in the Quantity menu on any product page and save between 10% and 30%.

Do I need anything else?

Sterile bacteriostatic water to reconstitute the vials, and a fridge and freezer for storage.

Buy immune peptides online

Pick a product above, add it to your cart and check out in a couple of minutes. Everything on this page is in stock, and bulk packs bring the price down further. Not sure this is the right range? See all research peptides.

For laboratory research use only. Not for human or veterinary use.

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