The e-mail invitation was pink, with red lipstick kisses dancing around the words "Botox Party!" The host, Dr. Ken Bermudez, a plastic surgeon in San Francisco, promised food, refreshments and fun.

One shopper says: "Lightweight, non-greasy, and effective. Over time, it noticeably improves the appearance of fine lines and tired eyes. Absorbs quickly and works well under moisturizer or sunscreen.

The question is: Can these products live up to such lofty claims? To find out, I tested each one of them for several consecutive days, with the goal of targeting my nasolabiel lins: the lines that run ...