Tryptophan was used as a control amino acid (100 M, 1 mM, 10 mM)
Glutathione decreases as we age and can also decrease with some environmental factors such as stress, infection, poor diet, or chronic disease (source)
According to Mayo Clinics drug and supplement reference, intramuscular B12 (the form used in MIXTs B12 injection protocols) is well-established for restoring B12 status quickly in clinically deficient patients and is often used when oral supplementation is poorly absorbed
The copper peptide group showed statistically significant improvements in skin density (ultrasound), collagen content (histology), and visual wrinkle depth outcomes that exceeded both the vitamin C and tretinoin groups by week 12
~ AlphaMD Most men have never considered that the trillions of bacteria living in their digestive tract have anything to do with their testosterone levels
Additionally, a few cells also express CYP27B1 and synthesize the physiologically active 1,25(OH)D