27 citations
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September 2017 in “Journal of Medicinal Food” In this study, researchers found that a polyphenolic extract from Annurca apples, high in procyanidin B2, increased hair growth, density, and keratin content in healthy subjects after 2 months of use, and stimulated keratin biosynthesis in vitro.
2 citations
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November 2019 in “Journal of Medicinal Food” 
13 citations
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December 2019 in “Nutrients” In human follicular cells, this study found that an Annurca apple-based dietary supplement may stimulate the production of hair keratins, suggesting potential benefits for hair growth.
November 2019 in “Journal of Medicinal Food” 
18 citations
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October 2018 in “Nutrients” This study found that Annurca apple polyphenolic extracts reprogram hair follicle metabolism in mice, enhancing mitochondrial activity and keratin production while inhibiting some metabolic pathways.