Harvest time affects antioxidant capacity, total polyphenol and flavonoid content of Polish St John’s wort’s (Hypericum perforatum L.) flowers by Katerina Makarova, Joanna J. Sajkowska-Kozielewicz, Katarzyna Zawada, Ewa Olchowik-Grabarek, Michał Aleksander Ciach, Krzysztof Gogolewski, Natalia Dobros, Paulina Ciechowicz, Hélène Freichels, Anna Gambin

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