Native IGF-1 binds with high affinity to insulin-like growth factor binding proteins (IGFBPs), which sequester the peptide in circulation and substantially reduce its free bioavailable fraction
EBioMedicine 47 , 402413 (2019)
Think of it like going to the gym
Plant Foods that Contain Glutathione While the focus of this review has been on foods and dietary-derived nutrients for the purpose of supporting antioxidant defenses, primarily by increasing glutathione levels and enzymes related to glutathiones activity, it is worthwhile to note that there are several foods that contain the thiol-rich compounds, glutathione, NAC, and cysteine (Table 2)
Depression: A meta-analysis of 5 RCTs (n=574) found that NAC significantly improved depressive symptoms, particularly in individuals with high baseline symptom severity (Fernandes et al., J Clin Psychiatry, 2016) [73]