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Defensin

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Also called: Beta Defensin, Defensin HNP-3 (human), alpha-Defensin 6

By The Health Stacks Research TeamUpdated September 15, 2026

Defensins are small proteins that act like shields for the body. They are part of the immune system and help fight off germs like bacteria and viruses. These proteins are found in many places, such as the skin, the gut, and on the surfaces of the lungs. Scientists study them to learn how the body protects itself from getting sick. They are grouped based on their shape and the way they are built inside the body.

The main job of defensins is to kill bad bacteria and stop viruses from entering cells. They work by poking holes in the germs or sticking to them to stop them from growing. Research shows they are very important for keeping the gut healthy and preventing infections in wounds. Some studies look at how they can help with diseases like diabetes or fight germs that are resistant to regular drugs. They act fast and are a key part of the body's first line of defense.

While defensins show promise, they are not yet sold as medicines. Scientists are still trying to understand exactly how they work and how to make them stable in the body. There is no standard dose for humans yet, and most research is done in labs or animals. Some defensins can be affected by high salt levels in the body, which might stop them from working. More testing is needed to see if they are safe and effective for people to use as treatments.

Research-stageEarly-stage — evidence so far is mostly cell, animal, or preliminary human studies. Not an approved medicine. Verified confidence80–100 — backed by strong, well-corroborated sources (peer-reviewed research, clinical guidelines). Our highest confidence tier.

Benefits

What Defensin Helps With

The benefits people report — backed by research.

Antimicrobial & antiviral (3)

Antimicrobial activity against Gram-negative bacteria, Candida, and enveloped viruses 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Antimicrobial activity against Gram-positive and Gram-negative bacteria 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Antifungal, antiparasitic, and antiviral activity 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →

More reported benefits (5)

Binding of LPS in septic shock models 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Defensin family peptides contribute to intestinal innate immunity 90/100Rated 90/100Source typePeer-reviewed studyIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Putative tumor suppressor activity in multiple cancer types 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Immune modulation 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →Angiogenesis 72/100Rated 72/100Source typeEstablished referenceIndependent sources1Every claim links to the page it came from, and stronger sources rate higher. Full methodology →

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Evidence

Research Citations (47)

Every claim above traces back to a source you can check — here are 47 of them.

  • Lactobacillus crispatus modulates epithelial cell defense against Candida albicans through Toll-like receptors 2 and 4, interleukin 8 and human β-defensins 2 and 3.

    2013 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Human antimicrobial peptides: defensins, cathelicidins and histatins.

    2005 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Defensins in innate immunity.

    2011 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Plant defensins.

    2002 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Antibacterial Activity of Plant Defensins

    95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Antibacterial Activity of Plant Defensins.

    2019 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • The fungal defensin family enlarged

    95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • The fungal defensin family enlarged.

    2014 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Primate defensins.

    2004 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • The Defensins Consist of Two Independent, Convergent Protein Superfamilies

    95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • The Defensins Consist of Two Independent, Convergent Protein Superfamilies.

    2016 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Convergent evolution of defensin sequence, structure and function

    95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Convergent evolution of defensin sequence, structure and function.

    2017 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Evolution of cnidarian trans-defensins: Sequence, structure and exploration of chemical space

    95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source
  • Evolution of cnidarian trans-defensins: Sequence, structure and exploration of chemical space.

    2019 95/100Rated 95/100Source typePeer-reviewed studyIndependent sourcesstill being verifiedEvery claim links to the page it came from, and stronger sources rate higher. Full methodology →
    Source

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