Melittin

melittin, honeybee venom main peptide, component of apitoxin (Apis mellifera venom)

Antimicrobial & antiviral

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Summary

Class: Naturally occurring 26-amino-acid amphipathic, cationic membrane-active peptide; the main toxin (~40–50% of dry weight) of honeybee venom
Mechanism: A detergent-like peptide that inserts into and lyses cell membranes — this is behind both its antimicrobial/anticancer activity in the lab and its toxicity and pain
Routes studied: In vitro and animal mostly; in people, almost all human exposure is via whole bee venom (stings or bee-venom acupuncture), not purified melittin
Half-life: Not well characterised in humans; cleared rapidly, binds membranes avidly
Storage: Research peptide; not a consumer product
Regulatory status: Not an approved drug anywhere. Whole bee-venom products are regulated variously; purified melittin is a research chemical

Doses are as reported in studies or by the community — never recommendations.

1What it is

Melittin is the main active component of honeybee (Apis mellifera) venom — a short, water-loving-and-fat-loving ("amphipathic") peptide that makes up a large fraction of the venom's dry weight. It is what makes a bee sting hurt and what makes the venom break open cells. It has been studied for decades as a model membrane-active peptide and, more recently, for possible antibacterial and anticancer uses.

Importantly, nearly all human experience is with whole bee venom, delivered by stings or by "bee-venom acupuncture," not with purified melittin. Isolated melittin is a laboratory compound. There is no established community practice of self-administering purified melittin, and doing so would carry a serious risk of membrane damage and allergic reaction.

2How it's thought to work

Membrane lysis. melittin molecules insert into lipid membranes and aggregate into pores, making the membrane leak and ultimately rupture. This non-selective mechanism hits bacterial, fungal, viral-envelope and human cell membranes alike — which is exactly why it is hard to use as a drug.

Anti-inflammatory vs pro-inflammatory. confusingly, melittin shows both. At some concentrations it activates phospholipase A2 and drives inflammation (part of a sting's effect); in other models low doses appear to dampen inflammatory signalling (NF-κB). The direction depends heavily on dose and context.

Anticancer interest. the same pore-forming action kills tumour cells in culture; research focuses on targeting or packaging melittin (e.g. in nanoparticles) so it hits cancer cells without destroying healthy ones.

The main toxin of bee venom, and a strong pore-former. It does not distinguish bacterial from human membranes, which is the obstacle every therapeutic attempt has run into.Schematic — not to scale

3What the research shows

Graded C/D

Antimicrobial activity

Melittin kills a broad range of bacteria and fungi , including some drug-resistant strains, and shows synergy with conventional antibiotics in lab studies. Activity in animals is limited by toxicity. No human antimicrobial use.

Graded C/D

Anticancer activity

Extensive in-vitro and rodent work reports melittin killing many cancer cell types and, in targeted/nanoparticle forms, slowing tumour growth in mice (reviewed 2023, Int J Mol Sci / Molecules). All preclinical; no approved human cancer therapy.

Graded B/—

Bee-venom acupuncture in people

Small human studies of whole bee-venom therapy report possible benefit in musculoskeletal and some neurological conditions, but these use whole venom (not purified melittin), are small and often poorly controlled, and the safety picture is dominated by allergic reactions. A 2018 review (Toxicon) concluded efficacy and safety are both inadequately established and noted reported deaths from anaphylaxis in people who had received the therapy.

Anti-inflammatory / autoimmune models

Rodent studies report reduced inflammation in arthritis and other models; mechanism and human relevance unclear given the opposite effects seen at other doses.

4Reported side effects and interactions

Literature-reported

melittin is directly cytotoxic and haemolytic (bursts red blood cells); it causes pain, local inflammation and tissue damage. Whole bee venom carries a real risk of anaphylaxis, which can be fatal; deaths have been reported with bee-venom acupuncture.

Community-reported

Community use of purified melittin: essentially none documented, and strongly discouraged by the toxicity and allergy risk. Bee-venom acupuncture is practised in some traditions but is outside this site's scope.

Theoretical. non-selective membrane toxicity means any systemic exposure risks haemolysis and organ damage.

Interactions. none formally established; the overriding issue is intrinsic toxicity and allergenicity, not drug interactions.

Markers researchers commonly monitor

No compound-specific human monitoring is established because melittin is not administered as a medicine. In research and in the context of bee-venom exposure, relevant measures include: No established safe self-use exists to monitor.

Marker	Why it's watched
Markers of haemolysis (haptoglobin, LDH, plasma free haemoglobin)	because melittin bursts red cells.
Tryptase / signs of anaphylaxis	the dominant acute risk with any bee-venom exposure.
CBC and CMP	general safety baseline in any animal or early human study.

Free for everyone. Safety information is never behind a paywall.

5Formulation and handling

Research peptide handled under laboratory conditions only. This is not a reconstitute-and-inject compound; no calculator link is provided, and self-administration is not a described or safe practice.

6Commonly studied alongside

Conventional antibiotics (synergy studies), other membrane-active antimicrobial peptides such as Pexiganan and the Human defensins, nanoparticle delivery systems (research context).

Informational cross-links. Not stack recommendations.

7Regulatory status by region

Region	Status (checked —)
United States	Purified melittin is a research chemical, not an approved drug; whole bee-venom products are not FDA-approved therapeutics
European Union	Not an authorised medicine
United Kingdom	Not licensed
Australia	Not an approved product
South Africa	Not registered
Sport	Not specifically listed by WADA; irrelevant to performance use

8Open questions

Can melittin be targeted or packaged so its membrane-lysing action spares healthy cells enough to be a usable drug?
Does the anti-inflammatory signal seen at low doses translate to anything useful in humans?
Can whole bee-venom therapy be made reliably safe given the anaphylaxis risk?

9References

1Raghuraman H, Chattopadhyay A (2007). Melittin: a membrane-active peptide with diverse functions. Biosci Rep. PubMed · DOI
2Memariani H et al. (2019). Melittin: from honeybees to superbugs — antimicrobial and antibiofilm potential. Appl Microbiol Biotechnol. PubMed
3Rady I et al. (2017). Melittin, a major peptide component of bee venom, and its conjugates in cancer therapy. Cancer Lett. PubMed · DOI
4Wehbe R et al. (2019). Bee venom: overview of main compounds and bioactivities. Molecules. PubMed · DOI
5Park JH et al. (2018). To bee or not to bee: the potential efficacy and safety of bee venom acupuncture in humans. Toxicon. PubMed

References are being resolved to PubMed/DOI identifiers; links search PubMed for the citation until then.

10Community

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Self-reported side effects Phase 2

Not enough data yet. 0 of the 50 members needed have logged this compound for 4+ weeks. We don't show anything below 50, so no one can be identified.

11Page history

30 Oct 2026Profile published — awaiting medical review

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