January 28, 2011
No, you're not dreaming … and you are right: this cosmetic product you liked so much, that gave you so much pleasure, is no longer as good as it was. Well, what did happen?

The likely explanations

• Food for thought number one : You've modified your habits. "People scrupulously use a product at first," says April Armstrong, an assistant professor of dermatology in the University of California. "However, one makes some adaptation of his own along the time." And when one doesn't apply, say, an anti-aging serum or an acne lotion the way i should, results are not there.
• Food of thought number two : The product has been used for too long a time. For example, silicone -based hair products can build up, causing hair fibers to react differently to them after a while, according to Carmine Minardi, a co-owner of the Minardi Salon, in New York City.
• Other possibilities : "Changes in diet, climate, and your hormones may subtly affect the way a product responds," says Ni'Kita Wilson, a cosmetic chemist in Fairfield, New Jersey. So the oil-free moisturizer that did the job in humid summer months may not offer enough hydration …