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Kaempferol

Overview

Kaempferol is a flavonol polyphenol that occurs, mostly as glycosides, in leafy vegetables, culinary herbs, tea and some fruit. It is eaten in ordinary plant foods and is also sold as a commercial supplement. It is not interchangeable with quercetin or with whole-food flavonol intake [1,2].

The richest compiled plant sources include spinach and kale, with smaller amounts in broccoli, onions, blueberries, asparagus, leeks and brewed black tea [2]. An integrated review of isolated kaempferol reports frequent hormetic concentration–responses and senolytic-like activity, especially on ageing-related endpoints, but that evidence is molecular, cellular and animal rather than a demonstration that ordinary food portions reproduce those effects [1]. In aged mice, purified kaempferol added to chow improved behaviour and reduced inflammaging, and senescent T cells recovered mitochondrial quality control through mitophagy. That study did not measure fuel switching or glycaemic–insulin regulation [4].

Dietary Origin

Dietary exposure is a direct food occurrence: food → contains → kaempferol (typically as glycosides). Dabeek and Marra report compiled averages from Phenol-Explorer and the USDA flavonoid database, not fixed composition values for a single cultivar or serving. Their Table 1 lists those averages as kaempferol in mg/100 g fresh weight (black tea as mg/100 ml) and does not state whether the figures are free kaempferol or aglycone equivalents after glycoside hydrolysis: spinach 55.0, kale 47.0, Chinese cabbage 22.5, broccoli 7.20, onions 4.50, blueberries 3.17, leeks 2.67, asparagus 1.40, apples 0.14, and black tea 1.70 [2]. Herbs such as dill and chives are also listed as rich sources but are not yet mapped as foods here [2]. Capers are a concentrated condiment source in Phenol-Explorer even though they are absent from that compiled table; culinary portions remain small [3].

Kaempferol in foods is mostly glycosylated. Human absorption, circulating metabolites and food-matrix effects are therefore not the same as an isolated aglycone or a supplement capsule [2]. US adult kaempferol intake in that review is about 5.4 mg/day, with tea, onion, apple and red wine as major flavonol contributors at population level [2]. Food → contains → kaempferol does not establish that eating the food reproduces a hormetic or senolytic experiment [1,2].

Research Spotlights & Evidence Checks

🔬 Research Spotlight · isolated-substance

Does isolated kaempferol show hormetic and senolytic-like activity?

Calabrese and colleagues review frequent hormetic concentration–responses across cell types and animal models, with a strong focus on ageing-related endpoints, and place kaempferol alongside quercetin and fisetin as a senolytic-like flavonol [1].

Read the evidence

The paper is a synthesis of experimental dose–response work, not a food trial. It supports a qualified isolated-compound mapping and explicitly discusses limits on extrapolation to public-health or therapeutic use [1].

🔎 Evidence Check · whole-food

Do kaempferol-containing foods reproduce isolated hormetic or senolytic findings?

Not established. Composition databases establish occurrence in foods, while human dietary flavonols circulate mainly as conjugated metabolites at low concentrations; food occurrence is not an isolated-kaempferol intervention [1,2].

Read the evidence

Dabeek and Marra summarise food sources, glycoside-dependent bioavailability and cardiovascular-related human literature for dietary quercetin and kaempferol. Those relationships stay separate from the experimental hormesis review [2].

🔬 Research Spotlight · isolated-substance

Does purified kaempferol restore mitochondrial quality control in aged T cells?

Chen and colleagues fed 19-month-old mice chow supplemented with purified kaempferol at 50 or 100 mg/kg/day. Behaviour and multi-organ senescence markers improved, lifespan did not, and senescent T cells studied ex vivo recovered mitochondrial quality control through SIRT3–LKB1–AMPK mitophagy [4].

Read the evidence

The dietary arm used purified kaempferol mixed into laboratory chow, with the dose estimated from cage-level intake. After 8 weeks, the higher dose shortened tail-suspension immobility and improved rotarod time and grip strength, and lowered senescence and SASP transcripts in liver, kidney, muscle and adipose tissue. Survival curves did not separate. Peripheral T-cell composition shifted toward a higher CD4+/CD8+ ratio and more naïve cells, with lower circulating inflammatory cytokines. The thymus was not rejuvenated. Immunophenotyping used male mice only [4].

The mitochondrial measurements were made in CD3+ T cells from aged male mice, stimulated with anti-CD3/CD28 and treated with 50 μM kaempferol. Cellular and mitochondrial ROS fell, mitochondrial membrane potential rose, mitochondrial mass and the mtDNA/nuDNA ratio fell, and mitophagy markers moved in the direction of increased flux (LC3, p62 with bafilomycin, early mitochondrial PINK1, later loss of Tom20, autophagosome–mitochondrion colocalisation, and mitophagic bodies on electron microscopy). SIRT3 rose, LKB1 acetylation fell, and AMPK phosphorylation rose. CRISPR knockout of SIRT3 removed the LKB1–AMPK response, the mitophagy response, and suppression of TNF-α and IL-17A. The authors state that 50 μM is above typical plasma concentrations and was chosen as the highest non-toxic concentration in a short culture [4].

🔎 Evidence Check · isolated-substance

Does this study establish metabolic fuel switching?

It does not. The only fuel-mix measurement is a lower OCR:ECAR ratio in stimulated senescent T cells, with higher glycolysis, lower maximal respiration, and a stable Seahorse ATP-production parameter. Feeding, fasting, activity, fatty-acid oxidation and ketone use were not tested [4].

Read the evidence

Substrate flexibility is the right place to start, because metabolic flexibility means adjusting fuel use across feeding, fasting and activity. That capacity is BRS4 FM3 — Substrate Utilisation Flexibility, and its integrative primary mechanism is Metabolic Fuel Switching. Chen and colleagues activated AMPK, which in other tissues can participate in fuel selection, and they reported a change in oxidative versus glycolytic balance. In this experiment that change sits inside one stimulated immune-cell population at 50 μM. It does not establish the fuel-switching mechanism [4].

Mitochondrial resilience is the broader capacity to maintain and recover organelle function under challenge. Fuel switching is one contributor to that capacity. The measurements that this study actually carries — mitophagy, membrane potential, ROS, and preserved ATP-linked respiration while oxidative pressure falls — sit with BRS4 FM2 — Mitochondrial Resilience & Redox Stability, closest to Mitochondrial Protection (Redox Integrity). Those endpoints were ex vivo. The chow arm did not measure mitochondria in muscle, liver or brain [4].

Glycaemic–insulin regulation can support fuel switching, and that home is BRS6 FM1 — Glycaemic–Insulin Stability. Glucose, insulin and glycaemic variability were not measured. The rise in extracellular acidification is a T-cell culture result. AMPK phosphorylation was tied, by the SIRT3 knockout, to mitophagy and cytokine suppression [4].

Recipes

13 recipes containing this substance

Black Bean & Sweet Potato Vegetable Chilli

A fibre-rich bean and vegetable chilli with warming spices and slow carbohydrates for steady energy and satiety.

Broccoli, Potato and Onion Soup

A smooth broccoli, potato and onion soup for 4, with the broccoli blended and rested before a short simmer.

Creamed Corn on Roasted Sweet Potato

Roasted sweet potato with creamed corn and a mixed lipid phase to enhance carotenoid absorption; served with broccoli for fibre and glucosinolates.

Ginger Yogurt and Blueberries

A polyphenol-rich breakfast bowl with high fibre, combining ginger, omega-3 nuts, blueberry polyphenols, and probiotic yogurt.

Linguine alle vongole mantecate (Linguine with cockles in a silky emulsified sauce)

Whole-wheat linguine with cockles in a silky emulsified sauce; Italian emulsification technique without cream, supporting taurine, B12, and choline intake.

Matcha Mitochondria Smoothie

Mitochondrial energising smoothie rich in polyphenols, magnesium, and antioxidants

Mitochondrial Power Bowl

A nitrate-rich, polyphenol-dense bowl combining leafy greens, beets, berries, nuts, and early harvest olive oil

Mixed-Leaf Tahini Caesar Salad

A Caesar-style mixed-leaf salad with a tahini, anchovy, caper and Parmesan dressing, using extra virgin olive oil retained from oil-packed capers.

Roast Duck Breast with Berry Sauce

A rich main dish built around crisp-skinned duck breast with a bright blueberry and raspberry sauce, designed to balance richness with acidity and aromatic depth.

Salmon Bowl-pistachio-cacao-nibs

A Mediterranean-style bowl combining salmon, avocado, pistachios, cacao nibs, and early harvest olive oil — rich in omega-3 fats, polyphenols, and fibre.

Savoury Greens & Egg Breakfast Skillet

A warm savoury breakfast skillet with eggs, greens, and slow carbohydrates for steady morning energy.

Turkey Wing Stew

A collagen-rich, glycine-heavy slow-cooked stew made from affordable turkey wings — rich in protein, tryptophan, and B vitamins.

Turmeric Lentil Dahl

Turmeric- and ginger-spiced lentil dish rich in fibre, folate, and polyphenols

Foods

9 foods

Asparagus

Folate-rich vegetable providing fibre and modest inulin-type fructans

Black Tea

Brewed tea providing theaflavins and catechins in a low-energy drink

Blueberries

Berries providing anthocyanins, vitamin C and fibre

Broccoli

Cruciferous vegetable rich in sulforaphane, folate, and glutathione precursors

Capers

Highest quercetin content among common foods

Kale

Leafy green providing vitamin C, vitamin K, calcium and carotenoids

Leeks

Allium vegetable with prebiotic fiber (FOS)

Onions

Inulin prebiotic, quercetin, and glutathione precursors

Spinach

Leafy green rich in iron, magnesium, folate, and carotenoids

Biological Regulatory Systems

Biological Regulatory System	Evidence-qualified relationship	Evidence
Inflammation & Oxidative Stress (BRS3)	Isolated kaempferol shows hormetic and senolytic-like activity in experimental systems. A separate aged-mouse study lowered multi-organ senescence and SASP markers and T-cell inflammatory cytokine secretion. Ordinary food exposure has not been shown to reproduce either finding	[1,2,4]
Mitochondrial Function & Bioenergetics (BRS4)	Purified kaempferol restored mitochondrial quality control in senescent mouse T cells through SIRT3–LKB1–AMPK mitophagy. That is a resilience finding under immune senescence. Substrate flexibility and glycaemic–insulin regulation were outside the measurements	[4]

References

[1] Calabrese et al. (2025). Kaempferol, a widely ingested dietary flavonoid and supplement, enhances biological performance via hormesis, especially for ageing-related processes. Integrated review of isolated-kaempferol hormetic dose responses and senolytic-like ageing endpoints.

[2] Dabeek and Marra (2019). Dietary Quercetin and Kaempferol: Bioavailability and Potential Cardiovascular-Related Bioactivity in Humans. Compiles Phenol-Explorer and USDA food sources and reviews human bioavailability and cardiovascular-related dietary flavonol literature.

[3] Neveu et al. (2010). Phenol-Explorer: an online comprehensive database on polyphenol contents in foods. Composition database supporting caper and other polyphenol occurrence records that sit outside the Dabeek compiled table.

[4] Chen et al. (2026). Kaempferol alleviates T-cell immunosenescence and inflammaging in aged mice via the SIRT3-LKB1-AMPK-mitophagy pathway. Aged-mouse chow study of purified kaempferol, with the mitochondrial mechanism measured in senescent T cells. Supports a qualified resilience relationship and does not measure fuel switching or glycaemic–insulin regulation.