Skin-Smoothing Shots

Collagen
You can have two types of collagen (the fibrous protein that holds the skin together) injected: human (purified from cadavers) and bovine (purified from cows). It's best for lines around the lips, depressed acne scars and lip enlargement. While human collagen requires no allergy testing, bovine collagen does (two allergy tests are administered a month apart before the substance can be injected).
Cost: from $300 per treatment.
Lasts: about six months.
Possible side effects: temporary redness and swelling. While there has been concern about contracting mad-cow disease from bovine collagen, experts say this isn't likely. The concern that collagen injections can trigger autoimmune diseases like lupus is also unfounded, experts say.
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