skin whitening using glutathione: Second week using Met-tathione Brand

I am on my halfway through one bottle of the glutathione Met-tathione brand. During the first week of using it, I noticed that I had a different glow in my face. Actually, my face became lighter compared to other parts of my body. However, as I continue using the product, I noticed that my skin goes back to its original color. I do not know what went wrong. Maybe because my first week was just psychological effect on my part. I wanted to have lighter skin, and as a reaction of my body, it whitens itself. Nevertheless, as I continue to use it, I am now thinking maybe this product is just an exaggerated advertisement stunt. I do not go under the sun as much as before because I wanted to have a whiter skin and with the help of Met-tathione but now I do not see any effect on my part. For the record, my dosage is two capsules in the morning and evening together with 500mg of vitamin C. I am 74 kilos with a height of 5 feet 10 inches. Even with this result, I am positive that I will still attain that whiter skin that I aspire.