How about cosmetics or inner beauty products containing glutathione?

Just a little while ago, a glutathione cream was being sold on a home shopping channel, and as I kept looking at it, from a lump

I almost bought it. Is glutathione effective for skin improvement?

I've seen that applying it is better than eating it, but regarding glutathione products taken for inner beauty...

There were various options, and I suppose they advertise the cream as better, but they said on home shopping...