Hi Doctor, I Start In A Week Glutathione 1500 Mg

Hi doctor, I start in a week glutathione 1500 mg whith vitamin c of ivory caps whitening capsules and I stopped now because and i am afraid because it is not pharmaceutical product ,I wanted to know what it has side effects? I wanted to bleach my skin because I have lots of brown spots and birth mark .I am matte skin I dream of having a clear and white skin. please answer me.