Gian Carlo Tenore, Domenico Caruso, Giuseppe Buonomo, Maria D’Avino, Rita Santamaria, Carlo Irace, Marialuisa Piccolo, Maria Maisto, and Ettore Novellino (2018) Annurca Apple Nutraceutical Formulation Enhances Keratin Expression in a Human Model of Skin and Promotes Hair Growth and Tropism in a Randomized Clinical Trial. J. Med. Food 21(1) 90-103
This study investigated the hair growth-promoting effects of Annurca apple extract, a type of apple rich in oligomeric procyanidins, particularly procyanidin B2, found in abundance in Southern Italy.
However, a 2019 critical review of this study raised concerns regarding the clinical trial methodology (introduced in the next paper)
Key Highlights:
In vitro study: Annurca apple extract significantly promoted keratin protein expression in human skin cells.
Clinical trial: Participants receiving Annurca apple extract for two months exhibited a remarkable increase in hair growth, density, and keratin content compared to the control group.