glutathione helps with blood flow 9 Health Benefits of Glutathione - Wikipedia

Tiredness may result from reduced caloric intake due to appetite suppression, gastrointestinal side effects limiting food consumption, dehydration from vomiting or diarrhea, changes in blood glucose levels, or metabolic adjustments during significant weight loss

Earl AM, Losick R, Kolter R (2008) Ecology and genomics of Bacillus subtilis

Use of proteomics to demonstrate a hierarchical oxidative stress response to diesel exhaust particle chemicals in a macrophage cell line

Having treated thousands of patients with various types of foot pain, including plantar fasciitis, I can tell you that its rarely just a foot issue

Crystal and solution structural studies of mouse phospholipid hydroperoxide glutathione peroxidase 4

Your body weight and current age