How Keeping Glutathione Levels Up Can Benefit Your Health & Your Vitamin D Status GrassrootsHealth Figure 3 from Glutathione synthesis. Semantic Scholar Homocysteine and methionine are key amino acids with a vital connection to glutathione one of your body's most important substances! Methionine is abundant in many foods, so protein isn't the culprit, Ways to Boost Your Glutathione Levels for Optimal Health Deanna Minich