# Kaempferol (3,5,7-trihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/kaempferol-357-trihydroxy-2-4-hydroxyphenyl-4h-chromen-4-one
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-02
**Evidence Score:** 1 / 10
**Category:** Compound
**Also Known As:** 3,5,7-trihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one, Kaempferol aglycone, Robigenin, Pelargidenolon, C₁₅H₁₀O₆

## Overview

Kaempferol is a polyhydroxylated flavonol that exerts [antioxidant](/ingredients/condition/antioxidant) and [anti-inflammatory](/ingredients/condition/inflammation) effects by inhibiting key signaling nodes including NF-κB, PI3K/AKT, MAPK, and COX-1/2, while selectively inducing apoptosis in cancer cells through RSK2 binding and modulation of Bcl-2/BAD/p53 ratios. Preclinical data demonstrate anti-inflammatory activity at concentrations of 10–50 μM (reducing TNF-α and IL-1β) and cardioprotective effects in ischemia-reperfusion models, though robust human clinical trial evidence remains absent.

## Health Benefits

- **Antioxidant Defense**: Kaempferol scavenges [reactive oxygen species](/ingredients/condition/antioxidant) (ROS) and upregulates heme oxygenase-1 (HO-1), restoring superoxide dismutase (SOD) balance; in vitro studies show significant oxidative stress reduction across a 5–200 μmol/L concentration range.
- **[Anti-Inflammatory](/ingredients/condition/inflammation) Activity**: Kaempferol dose-dependently suppresses TNF-α, IL-1β, IL-6, and IL-18 at 10–50 μM via Akt/NF-κB inhibition and COX-1/2 blockade, with additional suppression of iNOS, COX-2, and CRP demonstrated in cell culture models.
- **Cardioprotective Effects**: In cardiac fibroblast models, 12.5–25 μg/mL kaempferol suppresses pro-fibrotic and inflammatory cytokines including IL-6 and IL-18; ischemia-reperfusion studies show it elevates Bcl-2 and [mitochondrial](/ingredients/condition/energy) cytochrome c while reducing Bax and cytoplasmic cytochrome c to limit cardiomyocyte apoptosis.
- **Anticancer Potential**: Kaempferol prolongs MAPK pathway activation to trigger apoptosis in MCF-7 (breast) and A549 (lung) cancer cell lines by binding RSK2 at Val82 and Lys100 residues, reducing Bcl-2 and elevating BAD and p53 expression, while sparing normal cells.
- **Rheumatoid Arthritis Modulation**: Kaempferol suppresses ERK-1/2, p38, JNK, and NF-κB in experimental arthritis models, reducing joint inflammation; it also inhibits Src kinase to curb COX-2 expression in inflamed tissue.
- **Cytoprotection Against Lipotoxicity**: Kaempferol neutralizes 7β-hydroxycholesterol-induced toxicity in vascular smooth muscle cells, suggesting a protective role against oxysterol-driven atherosclerotic processes.
- **[Neuroprotective](/ingredients/condition/cognitive) and Metabolic Support**: Epidemiological data link higher dietary kaempferol intake to reduced risk of chronic degenerative diseases; preclinical models suggest benefits in metabolic and neuroinflammatory contexts via PI3K/AKT pathway inhibition and NF-κB suppression.

## Mechanism of Action

Kaempferol exerts its effects through multi-target modulation of [inflammatory](/ingredients/condition/inflammation) and survival signaling cascades. It competes with ATP for binding to PI3K, blocking downstream AKT phosphorylation and reducing cell survival and proliferation signals in both cancer and inflammatory cell contexts; simultaneously, it inhibits Src kinase activity, thereby suppressing COX-2 transcription in tumor-promoting environments. At 40 μM, kaempferol blocks NF-κB nuclear translocation, diminishing transcription of pro-inflammatory genes including those encoding TNF-α, IL-1β, IL-6, iNOS, and COX-2, while also inhibiting MAPK subfamily members ERK-1/2, p38, and JNK in rheumatoid and oncological models. In the apoptotic axis, kaempferol binds RSK2 (a downstream MAPK effector) at Val82 and Lys100, sustaining pro-apoptotic signaling that upregulates BAD and p53 while downregulating Bcl-2; concurrently, it upregulates HO-1 to buffer [oxidative stress](/ingredients/condition/antioxidant) in normal cells, creating a differential selectivity between malignant and healthy tissue.

## Clinical Summary

No completed randomized controlled trials specifically isolating kaempferol as an intervention with reported numerical effect sizes, confidence intervals, or defined sample sizes are documented in the current peer-reviewed literature. Epidemiological data from dietary surveys and cohort studies suggest that populations with higher habitual flavonol intake exhibit reduced chronic disease burden, but these findings cannot be attributed solely to kaempferol given the complexity of dietary exposures. Preclinical in vivo rodent models support [anti-inflammatory](/ingredients/condition/inflammation), cardioprotective, and antiproliferative endpoints, providing biological plausibility for future human trials. Overall, clinical confidence in kaempferol supplementation for specific health outcomes remains low, and therapeutic application in humans awaits properly designed phase I/II safety and efficacy trials.

## Nutritional Profile

Kaempferol is a pure aglycone flavonol (molecular formula C₁₅H₁₀O₆; molecular weight 286.24 g/mol) with no caloric, macronutrient, or conventional micronutrient value as an isolated compound. In food matrices, kaempferol concentrations range from approximately 2–10 mg/100g in raw kale and spinach to trace amounts in most other vegetables and fruits. It is predominantly present in plants as glycosylated forms (kaempferol-3-glucoside, kaempferol-3-rutinoside, astragalin) that require intestinal hydrolysis by β-glucosidases before absorption as the free aglycone. Bioavailability is estimated at less than 10% for the free compound due to extensive first-pass [metabolism](/ingredients/condition/weight-management); the presence of dietary fat, gut microbiota composition, and the specific glycoside form all significantly influence absorption efficiency.

## Dosage & Preparation

- **Dietary Sources (Natural Form)**: Kaempferol is consumed as part of whole foods; kale, raw broccoli, spinach, endive, leeks, and strawberries provide milligram-level quantities per 100g serving; no standardized dietary target exists.
- **Standardized Plant Extracts**: Available as components of moringa leaf extract, ginkgo biloba extract, or fenugreek extract standardized to defined flavonol percentages (e.g., 24% flavone glycosides in ginkgo); kaempferol content per dose varies by source.
- **Isolated Kaempferol Supplements**: Pure kaempferol capsules or powders are commercially available, typically in doses of 50–500 mg/day; no clinically validated optimal human dose has been established.
- **Nano-formulations**: Nanoparticle-encapsulated kaempferol (liposomal, PLGA, or chitosan matrices) is under preclinical investigation and demonstrates superior bioavailability and cellular uptake compared to free compound; not yet commercially standardized.
- **Bioavailability Note**: Free kaempferol has low oral bioavailability due to rapid phase II [metabolism](/ingredients/condition/weight-management) (glucuronidation and sulfation); food-matrix effects, lipid co-administration, and nano-encapsulation improve absorption; timing with high-fat meals may modestly enhance uptake.
- **Research Concentrations (In Vitro Reference Only)**: [Anti-inflammatory](/ingredients/condition/inflammation) effects observed at 10–50 μM; NF-κB inhibition at 40 μM; these do not directly translate to equivalent human oral doses.

## Safety & Drug Interactions

Kaempferol is generally considered safe when consumed through dietary sources, and isolated supplementation has not been associated with significant adverse events in the limited available human exposure data; however, comprehensive human toxicology studies are lacking, and a formally established tolerable upper intake level does not exist. At high experimental concentrations, kaempferol has shown estrogenic activity in vitro, raising theoretical concerns regarding use in hormone-sensitive conditions such as estrogen receptor-positive breast cancer, endometriosis, or uterine fibroids, though human relevance at dietary doses is unconfirmed. Kaempferol may interact with cytochrome P450 enzymes (notably CYP3A4 and CYP1A2) and P-glycoprotein transporters, potentially altering the pharmacokinetics of co-administered drugs including certain chemotherapeutics, anticoagulants, and immunosuppressants. Pregnant and lactating women should exercise caution and avoid high-dose supplementation given the absence of safety data in these populations; standard dietary intake through whole foods is not considered a concern.

## Scientific Research

The evidence base for kaempferol is heavily weighted toward preclinical in vitro and in vivo research, with the majority of mechanistic data derived from cell culture studies using cancer cell lines and rodent models of [inflammation](/ingredients/condition/inflammation), ischemia-reperfusion, and arthritis. No large-scale, well-powered randomized controlled trials (RCTs) in human subjects with quantified outcomes have been published as of current literature reviews, representing a significant gap between mechanistic promise and clinical validation. Epidemiological cohort analyses have observed inverse associations between dietary flavonol intake (including kaempferol from food sources) and incidence of certain cancers and [cardiovascular](/ingredients/condition/heart-health) events, though these associations do not establish causality and are confounded by overall dietary pattern. The emergence of nano-formulation and pharmacokinetic optimization studies signals growing translational interest, but definitive human dose-response or efficacy trials are still lacking, placing kaempferol firmly in the preclinical-to-early-translational stage of evidence development.

## Historical & Cultural Context

Kaempferol was not historically isolated or used as a pure compound; rather, its botanical sources have long histories of medicinal application across multiple traditional systems. In Ayurvedic medicine, kaempferol-rich plants such as moringa (Moringa oleifera) and fenugreek have been employed for [anti-inflammatory](/ingredients/condition/inflammation), diuretic, and rejuvenating purposes for over 2,000 years. Traditional Chinese Medicine incorporated ginkgo biloba — one of the richest kaempferol-containing botanicals — in formulas for [cognitive](/ingredients/condition/cognitive) support and circulatory health, a use documented in the Shen Nong Ben Cao Jing. European herbalism historically used quercetin- and kaempferol-containing plants such as elder and hawthorn for heart and inflammatory conditions, though the phytochemical identity of their active constituents was not characterized until modern analytical chemistry emerged in the 19th and 20th centuries.

## Synergistic Combinations

Kaempferol demonstrates synergistic [anti-inflammatory](/ingredients/condition/inflammation) and anticancer activity when combined with other flavonoids such as quercetin, as both compounds share overlapping PI3K/AKT and NF-κB inhibitory mechanisms that together produce additive or supra-additive pathway suppression. In nano-formulation research, pairing kaempferol with curcumin or resveratrol in co-delivery systems enhances cellular uptake and prolongs bioavailability while simultaneously targeting complementary apoptotic and [antioxidant](/ingredients/condition/antioxidant) pathways. Kaempferol has also been noted to potentiate the efficacy of certain conventional chemotherapeutic agents in preclinical models, possibly through modulation of Bcl-2 family proteins that influence drug-induced apoptotic sensitivity, though clinical validation of these combinations is not yet available.

## Frequently Asked Questions

### What foods are highest in kaempferol?

Kaempferol is most concentrated in cruciferous and leafy green vegetables, with raw kale, spinach, endive, and broccoli providing approximately 2–10 mg per 100g serving. Other notable sources include leeks, chives, strawberries, grapes, ginkgo biloba, moringa leaf, and green tea; cooking can reduce kaempferol content by 20–50% depending on method and duration.

### Does kaempferol have proven anticancer effects in humans?

As of current literature, kaempferol's anticancer effects have been demonstrated in preclinical in vitro and in vivo studies — particularly in breast (MCF-7) and lung (A549) cancer cell lines — but no completed human clinical trials with measurable effect sizes have been published. Epidemiological data suggest associations between higher dietary flavonol intake and reduced cancer incidence, but these do not establish kaempferol specifically as causally protective in humans.

### What is the recommended dosage of kaempferol supplements?

No clinically validated human dose for isolated kaempferol supplementation has been established, as large-scale RCTs are lacking. Commercial supplements typically range from 50–500 mg per day; in vitro anti-inflammatory effects are observed at 10–50 μM concentrations, but direct translation of these figures to equivalent oral doses in humans has not been validated, and bioavailability of the free compound is estimated at below 10%.

### Is kaempferol safe to take with medications?

Kaempferol may inhibit cytochrome P450 enzymes CYP3A4 and CYP1A2 as well as P-glycoprotein drug transporters, which could alter plasma levels of drugs processed through these pathways including certain chemotherapeutics, anticoagulants like warfarin, and immunosuppressants such as cyclosporine. Anyone taking prescription medications should consult a healthcare provider before using high-dose kaempferol supplements, as formal drug interaction studies in humans are not yet available.

### How does kaempferol work as an anti-inflammatory?

Kaempferol reduces inflammation by blocking NF-κB nuclear translocation at approximately 40 μM, suppressing transcription of pro-inflammatory genes including TNF-α, IL-1β, IL-6, iNOS, and COX-2. It also inhibits the PI3K/AKT signaling axis by competing with ATP for PI3K binding, and directly inhibits COX-1 and COX-2 enzyme activity, collectively reducing inflammatory mediator synthesis in a dose-dependent manner demonstrated across 10–50 μM in cell culture models.

### What is the most bioavailable form of kaempferol, and how does absorption compare across different sources?

Kaempferol bioavailability varies significantly depending on source and food matrix; glycoside forms (bound to sugars in plants) typically show lower direct absorption than aglycone forms, though gut microbiota can convert glycosides to active aglycones. Supplemental kaempferol absorption is enhanced by lipids and may be further increased through quercetin co-administration, while tea and onion sources provide naturally chelated forms that improve intestinal uptake. Studies show peak plasma concentrations occur 1–2 hours post-ingestion, with total bioavailability ranging from 4–30% depending on formulation and individual gut microbiota composition.

### Who would benefit most from kaempferol supplementation based on current research?

Individuals with chronic inflammatory conditions (rheumatoid arthritis, inflammatory bowel disease), elevated oxidative stress markers, or metabolic syndrome may benefit most from kaempferol, given its demonstrated dose-dependent suppression of pro-inflammatory cytokines (TNF-α, IL-6, IL-1β) and ROS-scavenging capacity. People with poor dietary intake of kaempferol-rich foods (leafy greens, berries, cruciferous vegetables) and those seeking cardiovascular or neuroprotective support also represent target populations. However, optimal candidates should have confirmed biomarkers of inflammation or oxidative stress, as benefits are most evident in pre-existing dysregulation rather than general wellness.

### How does kaempferol's antioxidant mechanism differ from other common flavonoids like quercetin or luteolin?

Kaempferol's antioxidant potency is moderately lower than quercetin (due to fewer hydroxyl groups on its B-ring) but comparable to luteolin; however, kaempferol uniquely upregulates heme oxygenase-1 (HO-1) and restores superoxide dismutase (SOD) balance through cellular signaling rather than direct free-radical quenching alone. While quercetin shows broader cytochrome P450 inhibition, kaempferol demonstrates more selective Akt/NF-κB pathway modulation, making it particularly effective for inflammatory conditions. The 3,5,7-trihydroxy-4H-chromen-4-one structure of kaempferol provides optimal binding to intracellular antioxidant enzymes, distinguishing its mechanism from purely scavenging flavonoids.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*