Glutathione + Vitamin C IV Therapy for Skin Brightening in Seattle The Food and Drug Administration (FDA) warns the public on the dangers associated with the use of injectable lightening agents such as glutathione and Vitamin C. In the Philippines, several health and Vitamin C vs Glutathione whats the difference? Both brighten the look of skin but they work in different ways. Vitamin C helps visibly brighten and improve the appearance of sun damage while 25% Vitamin C + Glutathione Clinical Serum for Brightening & Dark Spots