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Limited evidenceEye health

Dendrobium

An orchid used in Chinese medicine as a yin tonic for dryness, including dry eyes. The dry-eye research is genuinely interesting but entirely in rats, cells and mice — no human trial has been published.

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What the science says

  • Relief of dry eye Limited evidence

    Dendrobium extracts alleviated dry eye disease in a rat model by regulating aquaporin expression and MAPK/NF-kB signalling. The effect was measured in animals, and no clinical trial has tested dendrobium in people with dry eye.

  • Stimulating tear and mucous secretion Limited evidence

    Polysaccharides from Dendrobium officinale were shown to induce aquaporin 5 translocation by activating M3 muscarinic receptors in vitro, a mechanism consistent with promoting fluid secretion. This is cell-level evidence for a plausible pathway, not a demonstrated clinical effect.

  • Corneal repair Limited evidence

    Nanovesicles derived from Dendrobium officinale enhanced corneal epithelial repair and reduced inflammation in a mouse dry eye model. This is early-stage preclinical work on an experimental preparation, not the extract sold as a supplement.

Dosage & safety

Studied doseNo clinically studied dose. Traditional decoction use is 6–12 g of dried stem per day; extract capsules typically list 500–1000 mg without trial support.
SafetyLong culinary and medicinal use in East Asia with few documented problems, but formal human safety data are lacking. Dendrobium products have been associated with adulteration by stimulants such as DMAA and phenethylamine derivatives in the sports supplement market — buy only from suppliers who test for this. Avoid in pregnancy and breastfeeding for lack of data. Some Dendrobium species contain alkaloids with cardiovascular activity, so species labelling matters.

How to take it

TimingTiming does not matter - no dose or schedule has been clinically studied.
With food?With food; it has a long culinary history in East Asia and is well tolerated that way.
Worth knowingSpecies labelling matters: some Dendrobium species contain alkaloids with cardiovascular activity, and 'Dendrobium extract' on a label tells you nothing about which one.

Interactions

With medications

  • blood pressure medication, stimulants and MAO inhibitors

    The plant itself has no documented interactions, but sports supplements labelled Dendrobium have repeatedly been found spiked with DMAA and other phenethylamine stimulants, which are dangerous with all three. avoid any pre-workout or fat-burner listing Dendrobium, and buy only from suppliers who test for stimulant adulterants

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does dendrobium help dry eyes?

Only in animals and cells: dendrobium extracts relieved dry eye in a rat model, but no human trial has been published, so the evidence is limited.

Is dendrobium safe in pre-workout supplements?

Be wary: sports supplements labelled dendrobium have repeatedly been found spiked with DMAA and other phenethylamine stimulants, which are dangerous with blood pressure medication, stimulants and MAO inhibitors. Buy only from suppliers who test for stimulant adulterants.

How much dendrobium should I take?

There is no clinically studied dose of dendrobium; traditional use is 6-12 g of dried stem per day, and extract capsules list 500-1000 mg without trial support. Species labelling matters, because some Dendrobium species contain alkaloids with cardiovascular activity.

Scientific references

Related in Eye health

Herbal medicines: what the evidence says (335)