While glutathione is widely thought to whiten the skin significantly, it really doesn't whiten it very much at all. Also it takes a very long time before any changes are noticeable, however small they are.
As to the safety of taking Glutathione with Alpha lipoic acid + Vitamins C and E, this is totally safe assuming the dosages are normal.
As a side note, glutathione taken orally is not absorbed very well by the body, typically over 90% of it is broken down before being absorbed. It is not bioavailable in its un-acetylated form. For the best bioavailability and absorption look for Acetyl glutathione supplements, precursors such as R-ALA and NAC can also help boost your GSH levels. Once again, if skin whitening is your goal you may be disappointed, but it will certainly do wonders for your overall health. Including the appearance and health of your skin, hair and nails.