Black Currant

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/A560E292A8A026C2A8CDAEB9AFE00259/S0007114520004468a.pdf/blackcurrant-ribes-nigrum-lowers-sugar-induced-postprandial-glycaemia-independently-and-in-a-product-with-fermented-quinoa-a-randomized-crossover-trial.pdf