Inadequate secretion of intrinsic factor, resulting from lesions that destroy the gastric mucosa (ingestion of corrosives, extensive neoplasia), and a number of conditions associated with a variable degree of gastric atrophy (such as multiple sclerosis, HIV infection, AIDS, certain endocrine disorders, iron deficiency, and subtotal gastrectomy)
Thighs and glutes are also common sites
Controversy: Whether current data justify clinical use in fertility, given limited human trials and mechanistic gaps
there is no FDA-approved human dose
Advocates suggest that regular glutathione injections can help even out skin tone and minimize the appearance of dark spots or marks, providing a clearer complexion