If your enzymes are under-functioning due to genetics or high stress, taking a precursor may not be as effective as taking the final product
Kidney transplantation and cystine-depleting therapy with oral and topical cysteamine have transformed cystinosis from a universally fatal childhood disorder into a treatable chronic disease, with many adults achieving normal lives
Raghu G, Berk M, Campochiaro PA, Jaeschke H, Marenzi G, Richeldi L, Wen F, Nicoletti F, Calverley P (2020) The multifaceted therapeutic role of N-Acetylcysteine (NAC) in disorders characterized by oxidative stress
Oh- Evan Brand: Here's one thing
Kirkman CD Biotic delivers 40 billion CFU per serving from three probiotic strains: Saccharomyces boulardii, Lactobacillus plantarum, and Lactobacillus rhamnosus
PLoS One 8 , e55407, doi: 10.1371/journal.pone.0055407 (2013)