I am a medium brown skinned girl.. I am under treatment for my acne scarring and asked my derm to give a medicine for skin glow and lightening. She prescribed me ethiglo tablets with 500mg L-glutathione. I have read in sites saying that one should take minimum of 2000mg glutathione per day in two doses for effective lightening in 2-3 weeks. So for achieving a visible skin lightening what is the dosage should I take and is there any substitute available for ethiglo because 2400rs for 30 tablets us way too expensive and I can't afford it if I have to increase the dosage. Please help me out. I seriously want to brighten my skin. And please suggest me something which will be visibly effective.