Supplement analysis backed by scientific evidence · PT

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Limited evidenceJoints & skin

Tremella

Tremella fuciformis is marketed as a plant-based hyaluronic acid alternative for skin, but that claim rests on the polysaccharide's water-binding chemistry in a beaker, not on oral trials. The only real human RCT tested cognition, not skin, and it was small.

What the science says

  • The 'plant hyaluronic acid' skin claim is chemistry, not clinical evidence Limited evidence

    Tremella polysaccharide is a highly branched glucuronoxylomannan that holds several hundred times its weight in water and, in lab measurements, has water-retention comparable to or exceeding hyaluronic acid. That property supports its use as a topical humectant in cosmetic formulations; there is no published placebo-controlled trial showing that swallowing Tremella improves skin hydration, elasticity, or wrinkles in humans.

  • Cognition in subjective cognitive impairment Limited evidence

    The one decent human trial randomized 75 adults with subjective cognitive impairment to 600 or 1,200 mg/day of Tremella fuciformis or placebo for 8 weeks and reported improvement on some computerized memory subtests in the active groups. It was a single small, short, single-centre study with multiple endpoints and no replication, which is not enough to call Tremella a nootropic.

  • Immune and metabolic effects Limited evidence

    Tremella polysaccharides show antioxidant, immunomodulatory, and glucose- and lipid-lowering activity in rodent and cell models, and the fungus is a good source of soluble fiber. No controlled human trial has demonstrated a clinical metabolic or immune benefit at supplement doses.

Dosage & safety

Studied doseThe cognition RCT used 600-1,200 mg/day of standardized extract for 8 weeks. Commercial skin-focused capsules commonly supply 100-500 mg/day of polysaccharide extract, below anything tested. As a food, dried Tremella is rehydrated and cooked, typically 5-10 g dry per serving.
SafetyA widely eaten food in East Asia with a good tolerability record; trial adverse events were mild and comparable to placebo. Its main hazard is not the mushroom itself: improperly stored rehydrated Tremella (and the related soaked fungus dishes) can grow Pseudomonas cocovenenans and produce bongkrekic acid, which has caused fatal food poisonings — never soak it at room temperature for extended periods. Theoretical antiplatelet activity means caution alongside anticoagulants or before surgery. Not studied in pregnancy. Not banned in sport.

Scientific references

Where to buy

Real Mushrooms, Tremella, Mushroom Extract Powder, 5.29 oz (150 g)

View on iHerb

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