Supplement analysis backed by scientific evidence · PT

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Limited evidenceJoints & skin

Tremella (Snow Fungus)

An edible mushroom whose polysaccharides hold water well in a test tube. It is marketed as an oral moisturiser, but the human data are almost entirely topical or on unrelated outcomes.

Evidence last reviewed: August 2026

What the science says

  • Skin hydration Limited evidence

    The moisture-binding capacity of Tremella polysaccharide is documented in laboratory work, and a cosmetic formulation study found that a snow mushroom hand product improved skin moisture where it was applied. There is no published randomised trial showing that swallowing Tremella improves skin hydration.

  • Cognitive function Limited evidence

    One randomised controlled trial in adults with subjective cognitive impairment reported improvements on some memory measures after Tremella fuciformis extract. It is a single small study with no independent replication, and it is unrelated to the skin claims the supplement is usually sold on.

Dosage & safety

Studied doseOral trials have used a few hundred milligrams per day of standardised extract for around eight weeks. No oral dose for skin hydration has been established, since that research is essentially all topical.
SafetyEaten as a food for centuries and well tolerated in short trials. Mushroom allergy is possible. Tremella polysaccharides show anticoagulant activity in laboratory work, so people on blood thinners should check with a clinician. No data in pregnancy.

Scientific references

Where to buy

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