What to do about plural and singular?
I'd say plural but the best way is to use the most commonly used form on packages for your country --Tacite (talk) 21:35, 29 July 2015 (CEST)
Some Japanese food products (i.e. jelly candies) include collagen amount in their nutrition table. (コラーゲン) --Tacite (talk) 10:24, 22 September 2019 (CEST)