What is Methylene blue (as longevity product)?

The short answer

Methylene blue is a dark blue dye made in a lab.

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What it is

Type
Phenothiazine dye (small molecule, not a peptide)
Also known as
methylene blue longevity, methylene blue drops, provayblue
How it works
Redox dye; accepts and donates electrons.

Regulatory status

Not FDA-approved for this use How we label status

As of October 4, 2026, Methylene blue (as longevity product) is not FDA-approved. FDA has approved a drug for human use with the same active ingredient, for acquired methemoglobinemia (IV).

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Federal (FDA)
Approved Rx only as IV injection for acquired methemoglobinemia (ProvayBlue; generics)

References

Sources as of October 4, 2026

  1. Drugs@FDA: www.accessdata.fda.gov/scripts/cder/daf/index.cfm