Top sources include: Gelatin Collagen Bone broth Pork rinds/pork skins Turkey and chicken (especially dark meat with skin on) Spirulina Sesame seeds Pumpkin seeds Cysteine- and Glutamine-Rich Foods Many protein-rich foods supply both of these amino acids: Whey protein (one of the most well-researched foods for raising blood and cellular glutathione levels) 21 22 Chicken and turkey Beef and pork Fish Yogurt and cottage cheese Tofu and tempeh Cruciferous Vegetables Broccoli, cauliflower, Brussels sprouts, kale, cabbage, collard greens, bok choy, radish, watercress, and arugula are rich in sulforaphane and related compounds
Reactions to the B12 itself could also occur, but they are extremely rare
Int J Mol Epidemiol Genet 7(3):105114 Dekker E, Tanis PJ, Vleugels JLA, Kasi PM, Wallace MB (2019) Colorectal cancer
These subgroups were as follows: I