formylmethionine

Amino-acidMethionine derivative

What is it

N-formylmethionine (fMet) is a modified form of the amino acid methionine in which a formyl group is attached to the amino group. It serves as the initiator amino acid for protein synthesis in bacteria, mitochondria, and chloroplasts (but not in cytoplasmic protein synthesis in human cells).

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Biological role (research)

Strong Evidence

Essential to bacterial and mitochondrial protein synthesis (biology, not a supplement benefit).

Supplemental use

Mixed Evidence

No documented therapeutic benefit from oral supplementation.

How it works

In bacterial and mitochondrial ribosomes, fMet is loaded onto the initiator tRNA and added to the start of every protein. After translation, the formyl group and often the methionine itself are removed. In humans, fMet-containing peptides released from bacteria or damaged mitochondria are recognized as danger signals by formyl peptide receptors on neutrophils and other immune cells, triggering inflammation. There is no nutritional or therapeutic use for fMet supplementation; it is a research and diagnostic compound.

Dosage

Not used as a supplement. No human dose has been established.

When and how to take it

Not applicable.

1 commercial form

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N-formyl-L-methionine (research)

Primarily a research compound.

Not used as a consumer supplement.

Safety

As an isolated compound, formylmethionine is not commonly supplemented. Its presence in the body comes from internal protein synthesis and infections; supplementing it has no established role.

Who should be cautious

Not a recommended supplement for any population.

Interactions

Not applicable as a supplement.

Frequently asked questions

Is formylmethionine a useful supplement?⌄

No. It has no documented therapeutic benefit and is primarily a biochemistry research compound.

What does it do in the body?⌄

It is the starting amino acid for protein synthesis in bacteria and mitochondria. Free fMet peptides from infections act as inflammatory signals.

References

formylmethionine on Wikidata — Wikidata link

formylmethionine (ChEBI:182822) — ChEBI link

formylmethionine (PubChem CID 911) — PubChem link

formylmethionine on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on formylmethionine (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.