Now that Botox has been approved by the Food and Drug Administration, fans of cosmetic quick fixes are buzzing about the next miracle injectable. It's Restylane, a synthetic hyaluronic acid that, like collagen, can fill in facial lines and plump up lips. It's already a hit in Europe and Canada, though its maker has yet to seek approval in the U.S. But last week it completed its U.S. clinical study, and the results were impressive. Restylane outperformed a collagen-based substance by a 6-to-1 ratio. Unlike collagen, which lasts only about three months for some patients, Restylane can last six months or...
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