From my research into sources of nutrition, the ingredients in bold are considered questionable. Many of them are synthetic nutrients and those can be processed with coal tar which is a known carcinogen. Menadione is banned in human food and in pet food is several countries around the world because it is considered to be a carcinogen. Since they refer to so many of their added ingredients as “supplements” it is difficult to know whether they are synthetic or not.
Nutri-berries lists maltodextrin as its 8th ingredient which is problematic for humans as shown in the graphic below. Maltodextrin is used as a thickener, filler or preservative in many highly processed foods. It’s an artificially produced white powder that can be enzymatically derived from any starch, most commonly made from corn, rice, potato starch or wheat. It is a highly processed filler made from GMO corn that has no nutritive value. It spikes blood sugar, suppresses the natural growth of probiotics causing an inappropriate immune response to bacteria at the cellular level. It can also cause food allergies. While this information is presented for humans, I studied enough comparative anatomy and physiology to know that most toxins that create problems for humans can certainly create problems for other animals including parrots.
Along with other highly processed foods, I don't feed or recommend Nutri-berries or their other parrot food products.
INGREDIENTS IN NUTRI-BERRIES
Hulled white proso millet, corn (GMO?), oat groats, peanuts (animal grade?), hulled canary grass seed, red millet, safflower, maltodextrin, rapeseed, wheat, soybean meal, corn syrup, dicalcium phosphate, corn oil, ground limestone, glycerin, gelatin, whole egg, iodized salt, canola oil, choline chloride, DL-methionine (an amino acid), citric acid, mixed tocopherols (a preservative), calcium propionate (a preservative), vitamin E supplement, ascorbic acid, niacin supplement, manganese proteinate, zinc proteinate, carotene, calcium pantothenate, biotin, riboflavin supplement, sodium selenite, menadione sodium bisulfite complex (source of vitamin K activity), pyridoxine hydrochloride, copper proteinate, thiamine mononitrate, vitamin B12 supplement, vitamin D3 supplement, natural colors, folic acid.