If you eat these foods regularly, your glycine intake may already be meaningful supplement only what food does not cover
This form is vital for people under oxidative stress and depleted of natural GSH stores, whether due to illness (liver disease, Crohns, ME/CFS, Lyme, etc.) or toxic exposure (mold, environmental toxins, heavy metals, chemo, etc.) Nebulized (inhalable) glutathione : Used primarily for respiratory issues, such as lung damage in firefighters and asthma/COPD sufferers
Until proper human trials are conducted, users are essentially volunteering as test subjects in an uncontrolled experiment with their own bodies.
If your high B12 is from supplements or injections, stopping or reducing the dose will allow levels to return to normal over weeks to months