Source 1: Berry Health Benefits Network, http://berryhealth.fst.oregonstate.edu/health_healing/fact_sheets/index.htm.
Source 2: http://www.telegraph.co.uk/news/uknews/1554956/Study-claims-blackcurrant-is-No-1-superfruit.html.
Source 3: C. Lister et al., The nutritional composition and health benefits of New Zealand tamarillos, Crop & Food Research
Report No. 1281, 2005, page 17, table 14: Antioxidant activity (as measured by the ABTS assay) of some foods and supplements on a per 100g basis and per standard serving.