Asparagus, avocados, okra, and spinach contain high amounts of gluthathione, along with many other important vitamins and minerals
This answer can be reached much more easily and without using radiopharmaceuticals by documenting a single high blood ammonia concentration or by rectal ATT
Theres a meatiness in some Japanese rums (my traumatic encounter with Seven Seas attests to the peculiarity of the profile) which points in this direction, and while the overall quality cant be denied, it is something of a connoisseurs rum and I mean that not to be snobby, but to illustrate that if you have had a ton of rums and are looking for something unique, this one comes close
Punchoo R, Dreyer G, Pillay TS
Okras Nutritional Benefits Okra is packed with important vitamins and minerals, including vitamin B6, B1, folic acid, magnesium, and manganese, making it an excellent methylation-supporting food