Many recent studies have focused on herbal remedies and their pharmacological effects on metabolic syndrome. Crataegus pinnatifida has been widely used for cardiovascular function. Its leaves, fruits and seeds have various active substances such as, flavonoids, triterpenic acids and sesquiterpenes, which through different mechanisms can be beneficial in metabolic syndrome. Flavonoids found in the leaves of hawthorn and the fruit extracts contain two triterpenic acids, which are responsible for these benefits. 
Dehghani S, Mehri S, Hosseinzadeh H. The effects of Crataegus pinnatifida on metabolic syndrome: A review. Iran J Basic Med Sci. 2019 May;22(5):460-468. doi: 10.22038/IJBMS.2019.31964.7678. PMID: 31217924; PMCID: PMC6556496.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6556496/