J Clin Gastroenterol (1997) 25 Suppl 1:S17985
(This explains why hydroquinone has long been used for melasma removal , where brown or gray-brown patches of skin appear on foreheads, cheeks, chins and bridge of the nose.) In smaller doses (of at most 2%), hydroquinone can be purchased over-the-counter but pigment removal products with at least 4% hydroquinone concentration (considered to be the most effective concentration), require a prescription from a skin care specialist
It is not intended for human consumption, veterinary use, diagnosis, treatment, cure, or prevention of any disease
Emulsion and Ampoule: Take a moderate amount and apply from the inside to the outside of the skin
At therapeutic doses in healthy individuals, glutathione regenerates within hours to days after acetaminophen use