Hi  – yes, there are two ways to get glutathione:
1. We can produce it inside of our cells through methylation. And for that we need direct co-factors like the 3 amino acids glutamine, glycine and cysteine (hence why NAC supplement is so popular), and minerals like selenium, magnesium. Further upstream in the methylation cycle, we need vitamins B9, B12, B6 and methionine – another amino acid rich in animal meat.
2. We can also get it from the foods we eat. Here is a great list found in this study (scroll to p.6 for the list). Spinach, potatoes, squash, okra are some of the highest containing vegetables, and there are also some meats like beef and pork (which I know you can’t have). Take a look at the list and select based on your needs.

 go to https://sci-hub.se/ and copy/paste the DOI to open the study found here: https://www.tandfonline.com/doi/abs/10.1080/01635589209514173