Code: DEFEND · Immune

The training program for the immune system’s security team.

What it is

28-amino-acid peptide from the thymus gland.

Which cells it talks to

T-cells, dendritic cells, natural killer cells.

What it tells them to do

Immune signaling and T-cell maturation.

How the code runs

Activates toll-like receptors on immune cells and boosts T-cell responses.

What the research says

Human trials for hepatitis B and as a vaccine/treatment adjunct.

Regulatory status

Approved outside the U.S. (Zadaxin). Not FDA-approved. Not on FDA’s May 2026 category list.

Where to get it

Every body reads these codes a little differently, so every order includes a simple online intake and provider review before it ships. Shop online or explore the full peptide library.

This page is educational and is not medical advice. Peptides are not right for everyone. Some items require an online intake and provider approval. Individual results vary. Regulatory status reflects public FDA information as of October 2026 and can change.