Because glutathione levels decline as you age, and glycine can help slow the glutathione slide, it's a good idea to keep your levels high by eating protein rich foods, like organic poultry, grass fed How to Optimally Support Glutathione Levels in the Body? HOLOLIFE Center Glutathione: Myths vs. Facts , **Myth:** Glutathione supplements work instantly., **Fact:** Glutathione levels need time to build up in the body, and the benefits may take weeks to become Quantitative real time imaging of glutathione Nature Communications