Kaempferol (3,5,7-trihydroxy-2-(4-hydroxyphenyl)-4H-1-benzopyran-4-one) is a flavonoid found in many edible plants (e.g. tea, broccoli, cabbage, kale, beans, endive, leek, tomato, strawberries and grapes) and in plants or botanical products commonly used in traditional medicine (e.g. Ginkgo biloba, Tilia spp, Equisetum spp, Moringa oleifera, Sophora japonica and propolis). Numerous preclinical studies have shown that kaempferol and some glycosides of kaempferol have a wide range of pharmacological activities, including antioxidant, anti-inflammatory, antimicrobial, anticancer, cardioprotective, neuroprotective, antidiabetic, anti-osteoporotic, estrogenic/antiestrogenic, anxiolytic, analgesic and antiallergic activities.

Myricitrin is a naturally occurring polyphenol hydroxy flavonoid. Myricitrin has a variety of beneficial properties, such as antiviral, antimicrobial, antinociceptive, and anticarcinogenic activities. In particular, myricitrin possesses stronger oxidative resistance and free radical scavenging activity than other flavonol rhamnosides or quercetin. Myricitrin showed antipsychotic-like effects in animal models at doses that did not induce catalepsy or alter locomotor activity, suggesting that myricitrin may be a potential drug treatment for the positive symptoms of schizophrenia.

Pratol is an O-methylated flavone that can be found in Trifolium pratense and Caragana microphylla. It has been found to induce melanogenesis and stimulate tyrosinase activity in melanoma cells and may have potential as a tanning agent in the cosmetics industry. Pratol has also been investigated for potential anti-ischemic effects.

Quercitrin is known as a bio flavonoid antioxidant and was investigated extensively in its antioxidant potential in streptrozotocin (STZ)-induced diabetic rats. Quercitrin is also a constituent of the dye quercitron. Quercitrin can be found in Tartary buckwheat and in oaks species such as white oak or European red oak. Quercitrin has potential anti-inflammation effect that is used to treat heart and vascular conditions. Quercitrin offers protection against brain injury in mice by inhibiting oxidative stress and inflammation. Quercitrin also prevented CCl4 induced cerebral function disorders associated with its ability to inhibit the activities of monoamine oxidase (MAO), acetylcholine esterase (AChE) and the N-methyl-d-aspartate receptor 2B subunit (NR2B). Quercitrin suppressed the release of pro-inflammatory cytokines such as tumor necrosis factor alpha (TNF-α) and interleukin-6 (IL-6). Quercitrin may be a potential candidate to be developed as a neuroprotective agent. Quercitrin has been used previously as an antibacterial agent and has been shown to inhibit the oxidation of low-density lipoproteins and prevent an allergic reaction. It was demonstrated that quercitrin exerts protective effects against H2O2-induced dysfunction in lung fibroblast cells. Quercitrin has antiproliferative and apoptotic effects on lung cancer cells by modulating the immune response. There were significant increases in caspase-3 activity, loss of MMP, and increases in the apoptotic cell population in response to quercitrin in DLD-1 colon cancer cells in a time- and dose-dependent manner. These results revealed that quercitrin has antiproliferative and apoptotic effects on colon cancer cells. Quercitrin activity supported with in vivo analyses could be a biomarker candicate for early colorectal carcinoma.

Chrysin (aka 5,7-dihydroxyflavone) is a naturally occurring flavone found in honey, propolis, honeycomb, passion flowers, and Oroxylum indicum. Chrysin is used as an ingredient in dietary supplements and topical medications which are marketed to improve physical performance o treat various conditions. It has also been investigated for its immunoregulatory, anti-inflammatory an neuroprotective properties. Chrysin appears to be poorly absorbed and readily metabolize.