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"In a double-blind, placebo-controlled study conducted by Nakaishi et al. a powdered anthocyanin concentrate derived from black currants was provided to a number of participants.[1][unreliable medical source?] Participants received one of three doses of anthocyanins to measure if the result occurred in a dose-dependent manner. The period of dark adaptation was measured prior to and two hours following supplementation in all participants. Results from this experiment indicate that anthocyanins significantly accelerated dark adaptation at merely one dose level compared to the placebo.[1] Observing the data as a whole Nakaishi et al. concluded that anthocyanins effectively reduced the dark adaptation period in a dose-dependent manner.[1]
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