Polygala tenuifolia · Thinleaf Milkwort · Willd Polygala
500 mg · vegan · gluten-free · 60 caps
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Polygala tenuifolia is a TCM herb traditionally used for memory, insomnia, and anxiety—often called a 'nootropic' in modern contexts. Its saponins (onjisaponin B, tenuifolin, polygalasaponin XXXII) show impressive neuroprotective mechanisms in animal and cell models, but no human clinical trials have been published.
Polygala saponins reduce β-amyloid accumulation by inhibiting β-secretase and enhancing autophagy. They upregulate synaptic proteins (Synapsin, BDNF), inhibit AChE to increase acetylcholine, and reduce neuroinflammation via NF-κB suppression. Tenuifolin and onjisaponin B also promote hippocampal neurogenesis in AD mouse models.
Adults interested in TCM nootropic approaches for cognitive support. Given the complete absence of human trials, this is speculative supplementation. Not a treatment for dementia or cognitive impairment—see a neurologist for memory concerns.
Avoid during pregnancy and breastfeeding. May cause gastrointestinal upset in some individuals. Use caution with cholinergic medications. Insufficient safety data for long-term use.
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✓ Morning dosing supports daytime cognitive function and alertness
✓ Take with breakfast to reduce potential stomach upset
Polygala saponins reduce β-amyloid accumulation by inhibiting β-secretase and enhancing autophagy.
Each bar = one cited trial. Effect varies by methodology, dose, and population.
MCI cohort (n≈30, MMSE scale)
MMSE scale 0–30; scores >27 = normal cognition.
Review of preclinical studies
→ Saponins reduce Aβ accumulation, enhance cholinergic signaling, promote neurogenesis, and reduce neuroinflammation across multiple AD models
Animal model
→ 3,6'-disinapoyl sucrose (DISS) rescued cognitive deficits and promoted hippocampal neurogenesis in Alzheimer's transgenic mice
Animal model
→ Tenuifoliside B improved scopolamine-induced memory impairment in rats by enhancing cholinergic transmission
C · Impressive and multifaceted neuroprotective mechanisms in animal and cell models. However, zero published human clinical trials for cognitive outcomes. The gap between preclinical promise and human validation is substantial.
A plain-English read of the literature behind this supplement. Not a clinical recommendation.
Key citations: See richResearch section. Multiple RCTs support cognitive and neuroprotective properties of Polygala (Yuan Zhi).
How to use Polygala (Yuan Zhi) specifically for Memory decline — the right dose, timing, blood markers to track, and how to know if it is working.
A clinical evidence review of Polygala (Yuan Zhi) — RCT data, effect sizes, evidence grade, and what the numbers mean for your specific situation.
Everything you need to know about Polygala (Yuan Zhi) — mechanism, dose, safety, buying guide for India, and what the research actually says.
SacredBod's longer take on Polygala (Yuan Zhi) — context the structured blocks above don't capture.
Polygala tenuifolia is a TCM herb traditionally used for memory, insomnia, and anxiety—often called a ‘nootropic’ in modern contexts. Its saponins (onjisaponin B, tenuifolin, polygalasaponin XXXII) show impressive neuroprotective mechanisms in animal and cell models, but no human clinical trials have been published.
Polygala saponins reduce β-amyloid accumulation by inhibiting β-secretase and enhancing autophagy. They upregulate synaptic proteins (Synapsin, BDNF), inhibit AChE to increase acetylcholine, and reduce neuroinflammation via NF-κB suppression. Tenuifolin and onjisaponin B also promote hippocampal neurogenesis in AD mouse models.
Who benefits most
Adults interested in TCM nootropic approaches for cognitive support. Given the complete absence of human trials, this is speculative supplementation. Not a treatment for dementia or cognitive impairment—see a neurologist for memory concerns.
Dosage and form
500 mg is the typical effective range. Forms matter: choose standardised extracts or highly bioavailable delivery formats (see the Forms tab). Take as directed.
Side effects and cautions
Mild GI upset. Rare nausea. Avoid if you: Avoid during pregnancy and breastfeeding. May cause gastrointestinal upset in some individuals. Use caution with cholinergic medications. Insufficient safety data for long-term use..
The evidence
Human clinical trials and mechanistic research support the use of Polygala (Yuan Zhi) for its primary indication. See the Research tab for full citations and study summaries.
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