Hi Pinkelice,
Do you mean Regenerist Daily Regenerating Serum? I love this stuff, nothing quite works to moisturize, smooth, and firm the skin on my face like this product. Quite frankly, I'm not sure why it works so well. Olay's claim is that "Regenerist Daily Regenerating Serum uses a concentrated form of an exclusive amino-peptide complex and combines it with Olay moisture to offer the maximum regeneration and hydration" Vitamins E and B are also listed as an ingredient. Who really knows if the concentration levels are high enough to make a difference or even if these ingredients make a difference period. What I do know, is that in the six months I've been using this product there has been a marked improvement in the condition (smaller pores, fine lines reduced, brighter tone) and elasticity of my skin.
Hope this helps