Type of Study Human Clinical Study
Placebo-controlled, double-masked, crossover study
Study Setup Participants:12 male and female Duration:4 weeks Dosage:50 mg Blackcurrant Anthocyanins per day 
Key findings 50 mg Black currant Anthocyanins per day reduced the pressure in the eye statistically significant after 2 weeks and after 4 weeks of treatment. This decrease, however, was not observed in the placebo group, where no anthocyanins were given.The results show that oral administration of Black currant Anthocyanins may induce a beneficial decrease in eye pressure levels in patients with glaucoma as well as in healthy persons.
Authors  Hiroshi Ohguro, Ikuyo Ohguro, Saeko Yagi
Organisation Sapporo Medical University School of Medicine, Sapporo, Japan
Full research text Available at https://www.liebertpub.com/doi/pdf/10.1089/jop.2012.0071