Do not oxidize the disulfide , avoid contact with reducing agents (cysteine, glutathione, DTT)
Here's how the two codes compare side by side: Can 90471 and 96372 be billed together

Food Choices: What to Favor and What to Avoid Grilled chicken breast, turkey Fish and seafood (salmon, cod, shrimp) Eggs and egg whites Greek yogurt and cottage cheese Beans, lentils, and legumes Lean beef (sirloin, 93% ground) Protein shakes (when appetite is suppressed) Leafy greens: spinach, kale, romaine Broccoli, cauliflower, Brussels sprouts Whole grains: brown rice, quinoa, oats Chia seeds (fiber + protein in small portions) Apples, pears, berries Beans and legumes (fiber + protein) Avocado Olive oil Nuts and seeds Fatty fish (salmon, mackerel) Sodas and sweetened drinks Fruit juices and sports drinks Sweetened coffee drinks Candy, pastries, flavored yogurt Packaged snack foods with added sugar Fried foods (worsens nausea significantly) Fast food Fatty processed meats Chips, crackers, refined snack foods White bread, white pasta, white rice Alcohol (amplifies GI side effects) Spicy or highly acidic foods Large, heavy meals High-fat, high-sodium fast food Unsaturated fats from olive oil, avocado, and fatty fish may support GLP-1 secretion and provide important fat-soluble vitamins (A, D, E, K)

Randomized controlled trial of oral glutathione supplementation on body stores of glutathione. Eur J Nutr
However, the effects of the BASs on GLP-1 secretion are controversial