Kid Ginseng

In Traditional Chinese Medicine the root is tai zi shen or hai er shen. It is slightly bitter and neutral, and enters the Spleen and Lung channels ^{31Reference 31Yang Y et al. · 2025ReviewChemical Properties, Preparation, and Pharmaceutical Effects of Cyclic Peptides from Pseudostellaria heterophylla — [review]View study →}.

Its actions are to replenish qi, strengthen the Spleen, generate fluids and moisten the Lungs ^{30,31Reference 30Hu DJ et al. · 2019ReviewChemistry, pharmacology and analysis of Pseudostellaria heterophylla: a mini-review — [review]View study →Reference 31Yang Y et al. · 2025ReviewChemical Properties, Preparation, and Pharmaceutical Effects of Cyclic Peptides from Pseudostellaria heterophylla — [review]View study →}.

It is used for fatigue, poor appetite, weakness after serious illness and dry cough ^{30,32Reference 30Hu DJ et al. · 2019ReviewChemistry, pharmacology and analysis of Pseudostellaria heterophylla: a mini-review — [review]View study →Reference 32Li H et al. · 2025ReviewAdvances in Pseudostellaria heterophylla Research: Current Status and Future Directions — [review]View study →}. It is also taken for spontaneous sweating, thirst and dry mouth.

It is regarded as the mildest of the qi tonics, and it is neutral where Asian ginseng is warm.

Western herbalists who work with Chinese herbs use kid ginseng as a gentle tonic for fatigue, convalescence, weak digestion and general weakness.

In a dinitrochlorobenzene atopic-dermatitis mouse model, topical whole extract lowered serum IgE, suppressed IL-4, IL-6 and IFN-γ expression and downregulated NF-κB ^{2Reference 2Choi et al. · 2017AnimalImmunomodulatory effects of Pseudostellaria heterophylla on Th1/Th2 levels in mice with atopic dermatitis — mouse model, in vivoView study →}.

In reserpine-treated mice with a “spleen deficiency” pattern, 75% ethanol extracts of roots from eight growing regions raised thymus and spleen indices and prolonged swimming and anoxia survival. Potency varied with where the root was grown ^{3Reference 3Gong et al. · 2001AnimalThe effect of Radix Pseudostellariae from 8 habitats on spleen-deficiency and immunologic function — mice, in vivoView study →}.

In vaccinated chicks, dietary polysaccharide raised specific antibody titres, IgG, IgA, IgM, CD3 and lysozyme with a quadratic dose-response, and shifted splenic gene expression toward IgA production and cytokine signalling ^{4,5Reference 4Zhu et al. · 2024AnimalDietary supplementation with Pseudostellaria heterophylla polysaccharide enhanced immunity and changed spleen mRNA expression in chicks — animal model, in vivoView study →Reference 5Wang et al. · 2025AnimalEffects of Pseudostellaria heterophylla polysaccharide on humoral immunity and splenic lymphocyte gene expression in chicks — animal model, in vivoView study →}.

Saponins promoted macrophage phagocytosis and lymphocyte chemotaxis through the CCL5/CCR4 axis ^{6Reference 6Chen et al. · 2026In vitroRadix Pseudostellariae saponins promote immunocyte migration and chemotaxis via the CCL5/CCR4 axis — animal model, in vitroView study →}.

Gap: No human immune-function data, and the effective preparations (high-dose polysaccharide, topical extract) are not the oral decoction.

Most of this work is on isolated polysaccharides and cyclic peptides. A polysaccharide from the root stimulated glucose uptake in cells ^{8Reference 8Chen et al. · 2016In vitroStructural elucidation of a novel polysaccharide from Pseudostellaria heterophylla and stimulating glucose uptake in cells — in vitroView study →}. A second polysaccharide, H-1-2, improved insulin secretion, blood glucose and glucose and insulin tolerance in type-2 diabetic models by suppressing hypoxia and restoring SIRT1 ^{7Reference 7Fang et al. · 2018In vitroNovel polysaccharide H-1-2 from Pseudostellaria heterophylla alleviates type 2 diabetes mellitus — in vitro and rat, in vivoView study →}.

A pectic polysaccharide stimulated insulin secretion from INS-1 β-cells ^{9Reference 9Chen et al. · 2018In vitroStructure of a pectic polysaccharide from Pseudostellaria heterophylla and stimulating insulin secretion of INS-1 cells — in vitroView study →}, and H-1-2 protected podocytes in diabetic kidney disease by restoring SIRT1 and blocking epithelial–mesenchymal transition ^{10Reference 10Li et al. · 2023In vitroPolysaccharide H-1-2 ameliorates high-glucose-induced podocyte dysfunction by restoring SIRT1 — mouse model, in vivo and in vitroView study →}.

An oligopeptide-enriched fraction lowered fasting glucose and improved lipids in streptozotocin-diabetic mice ^{11Reference 11Chen et al. · 2025AnimalIdentification of oligopeptide components from Pseudostellaria heterophylla and hypoglycemic effects in streptozotocin-induced type 2 diabetes mice — mouse model, in vivoView study →}. Intestinal T cells from rats given the polysaccharide PF40 improved insulin sensitivity in liver cells through PI3K/AKT signalling ^{13Reference 13Kan et al. · 2025In vitroIntestinal CD4+ T cells treated with Pseudostellaria heterophylla polysaccharide improve insulin resistance via PI3K/AKT signalling — in vitroView study →}.

An engineered oral micropatch carrying heterophyllin B outperformed metformin in diabetic mice. The delivery system raised the oral bioavailability of heterophyllin B to 66%, about 3.3 times that of the free compound ^{12Reference 12Chen et al. · 2026AnimalAn engineered micropatch for oral delivery of heterophyllin B in type 2 diabetes treatment — mouse model, in vivoView study →}.

Gap: Entirely preclinical. The strongest results depend on purified fractions or a drug-delivery vehicle, and no clinical glycaemic endpoint exists.

In rats swum to exhaustion, root polysaccharides raised catalase, superoxide dismutase and glutathione peroxidase and lowered malondialdehyde in skeletal muscle ^{14Reference 14Chen et al. · 2013AnimalProtective effects of Radix Pseudostellariae polysaccharides against exercise-induced oxidative stress in male rats — rat, in vivoView study →}.

In cobalt-chloride-stressed H9c2 heart cells, polysaccharide, saponin and cyclopeptide fractions each showed protective, malondialdehyde-lowering activity ^{15Reference 15Wang et al. · 2013In vitroProtective effects of fractions from Pseudostellaria heterophylla against cobalt-chloride-induced hypoxic injury in H9c2 cells — in vitroView study →}.

In diabetic vascular tissue, heterophyllin B drove Nrf2 nuclear translocation and NQO1 upregulation ^{16Reference 16Lin et al. · 2026In vitroHeterophyllin B ameliorates diabetic lower-limb ischemia by inhibiting SMOX to activate the Nrf2 antioxidant pathway — mouse model, in vivo and in vitroView study →}.

The antioxidant readouts are mostly secondary endpoints inside disease-model studies, measured in tissue.

Suppression of NF-κB and Toll-like-receptor signalling, with lower TNF-α, IL-6 and IL-1β, recurs across unrelated models. Whole extract downregulated NF-κB and MAPK in atopic-dermatitis skin ^{2Reference 2Choi et al. · 2017AnimalImmunomodulatory effects of Pseudostellaria heterophylla on Th1/Th2 levels in mice with atopic dermatitis — mouse model, in vivoView study →}.

A purified cyclic-peptide extract eased smoke-induced COPD in rats through the TLR4/MyD88 pathway ^{17Reference 17Lu et al. · 2020AnimalCyclic peptide extracts from Pseudostellaria heterophylla ameliorate COPD via the TLR4/MyD88 pathway — rat, in vivoView study →}.

Root polysaccharides reduced sepsis-induced liver injury through the gut-microbiota–TLR4/NF-κB axis ^{18Reference 18Wang et al. · 2025AnimalRadix Pseudostellariae polysaccharides alleviate sepsis-induced liver injury by modulating gut microbiota via the TLR4/NF-κB pathway — mouse model, in vivoView study →}.

There is no standalone anti-inflammatory study and no human biomarker data.

In bleomycin-induced pulmonary fibrosis in mice, heterophyllin B at 5 or 20 mg/kg/day reduced collagen deposition and epithelial–mesenchymal transition through AMPK activation and STING suppression ^{19Reference 19Shi et al. · 2022In vitroProtective effects of heterophyllin B against bleomycin-induced pulmonary fibrosis in mice via AMPK activation — mouse model, in vivo and in vitroView study →}.

Follow-up studies found that it added to the effect of the antifibrotic drug nintedanib while easing that drug’s diarrhoea ^{20Reference 20Chen et al. · 2025AnimalSynergistic effects of heterophyllin B with nintedanib against experimental pulmonary fibrosis in mice — mouse model, in vivoView study →}, and that its benefit depends on a gut-bacterial metabolite, 3-hydroxybutyric acid, which suppresses IDO1-mediated ferroptosis ^{21Reference 21Chen et al. · 2025AnimalMuribaculum intestinale-derived 3-hydroxybutyric acid from heterophyllin B attenuates pulmonary fibrosis through IDO1-mediated ferroptosis — mouse model, in vivoView study →}.

The work is on one compound, from a small number of groups.

Gap: Single-compound, single-disease evidence in mice. The whole root has not been tested for an antifibrotic effect, and there is no clinical fibrosis data.

Root polysaccharide given by mouth at 100–400 mg/kg dose-dependently restored forced-swim endurance and normalised neuroendocrine and immune disturbances in a poly(I:C)-induced chronic-fatigue mouse model ^{22Reference 22Sheng et al. · 2011AnimalPolysaccharide of Radix Pseudostellariae improves chronic fatigue syndrome induced by poly(I:C) in mice — mouse model, in vivoView study →}.

Polysaccharide supplementation also raised exercise tolerance and lowered blood lactate in swim-tested rats ^{14Reference 14Chen et al. · 2013AnimalProtective effects of Radix Pseudostellariae polysaccharides against exercise-induced oxidative stress in male rats — rat, in vivoView study →}, and the eight-region spleen-deficiency study prolonged swimming and anoxia survival ^{3Reference 3Gong et al. · 2001AnimalThe effect of Radix Pseudostellariae from 8 habitats on spleen-deficiency and immunologic function — mice, in vivoView study →}.

The water-extracted polysaccharide is reasonably close to a decoction. The evidence is a small number of rodent studies using endurance endpoints, with no human fatigue or convalescence trial.

Heterophyllin B reduced liver fat and oxidative stress in metabolic-dysfunction-associated steatotic liver disease in mice, adding to the benefit of intermittent fasting through GLP-1R activation ^{23Reference 23Li et al. · 2025In vitroHeterophyllin B enhances the benefits of intermittent fasting in MASLD via GLP-1R activation — mouse model, in vivo and in vitroView study →}.

Root polysaccharides lowered liver-injury markers and restored the intestinal barrier in septic mice through the gut-microbiota–TLR4/NF-κB axis ^{18Reference 18Wang et al. · 2025AnimalRadix Pseudostellariae polysaccharides alleviate sepsis-induced liver injury by modulating gut microbiota via the TLR4/NF-κB pathway — mouse model, in vivoView study →}.

Both models involve a co-intervention or a specific insult. There is no direct hepatotoxin-protection data and nothing in humans.

Brain-permeable heterophyllin B reversed amyloid-β-induced axonal atrophy and improved memory retrieval in mice, acting through splenic T-helper modulation and neurite regeneration ^{24Reference 24Deng et al. · 2022AnimalHeterophyllin B, a cyclopeptide from Pseudostellaria heterophylla, improves memory via immunomodulation and neurite regeneration in Aβ-induced mice — mouse model, in vivoView study →}. It also improved cognition in APP/PS1 mice through a vagus nerve–spleen–gut microbiota–brain circuit ^{25Reference 25Jiang et al. · 2025AnimalHeterophyllin B alleviates cognitive disorders in APP/PS1 mice via the spleen–gut-microbiota–brain axis — mouse model, in vivoView study →}.

Root polysaccharide reduced amyloid burden and changed gut flora in 5×FAD mice ^{26Reference 26He et al. · 2024AnimalPseudostellaria heterophylla polysaccharide mitigates Alzheimer’s-like pathology via the microbiota–gut–brain axis in 5×FAD mice — mouse model, in vivoView study →}.

Gap: All in transgenic or insult models of Alzheimer’s disease, with no clinical data.

The root is used in Chinese folk medicine for digestive-system cancers ^{27Reference 27Gui et al. · 2025AnimalPseudostellaria heterophylla ameliorates colorectal cancer by remodeling the tumor immune microenvironment — mouse model, in vivoView study →}. An aqueous extract suppressed MC38 colorectal tumour growth in mice without obvious toxicity. It reduced tumour CCL5, cut M2 macrophage recruitment and increased CD8⁺ T-cell infiltration through JNK inhibition ^{27Reference 27Gui et al. · 2025AnimalPseudostellaria heterophylla ameliorates colorectal cancer by remodeling the tumor immune microenvironment — mouse model, in vivoView study →}.

A PD-L1-targeted nanoparticle carrying heterophyllin B improved checkpoint-inhibitor efficacy in a gastric-cancer allograft ^{28Reference 28Wei et al. · 2025AnimalPD-L1 antibody-modified nanocomposite loaded with heterophyllin B for gastric cancer — mouse model, in vivoView study →}. This is a formulation study rather than a test of the herb.

Gap: Two mouse tumour models, one dependent on an engineered nanoparticle; no whole-herb dose-finding and no human oncology data.

Toxicity. Kid ginseng has a long history as a food and medicine, and no serious adverse effects have been reported. A 2025 review classes it as a low-toxicity herb ^{1Reference 1Lei et al. · 2025ReviewTraditional uses, phytochemical constituents, pharmacological properties, and quality control of Pseudostellaria heterophylla (Miq.) Pax — reviewView study →}. In animal studies the whole extract has been given without obvious toxicity, for example in a mouse colorectal cancer model ^{27Reference 27Gui et al. · 2025AnimalPseudostellaria heterophylla ameliorates colorectal cancer by remodeling the tumor immune microenvironment — mouse model, in vivoView study →}.

Glucose-lowering drugs. Isolated polysaccharides and peptides from the root lower blood sugar in animals ^{7,11Reference 7Fang et al. · 2018In vitroNovel polysaccharide H-1-2 from Pseudostellaria heterophylla alleviates type 2 diabetes mellitus — in vitro and rat, in vivoView study →Reference 11Chen et al. · 2025AnimalIdentification of oligopeptide components from Pseudostellaria heterophylla and hypoglycemic effects in streptozotocin-induced type 2 diabetes mice — mouse model, in vivoView study →}. Concentrated extracts should be used with care alongside diabetes medicines. No drug-interaction study has been done.

Regulatory status. The root is official in the Chinese Pharmacopoeia as Radix Pseudostellariae. There is no WHO, ESCOP, EMA/HMPC or Commission E monograph.