Leave-in conditioners can be tricky -- pick the right one for your hair type and your mane looks soft, glossy and full. Make the wrong choice and you'll wind up with a flat, lifeless oil slick. Three testers with varying hair textures tried conditioning products that promised to tame flyaways, detangle, moisturize and leave a brilliant shine. Did these tall-order serums pass or fail?

Hair sold in Asia ends up on US women

When hair comes in to G&G Hair Extension, it all looks just about the same -- long, straight, black. Pretty much like what it is -- hair from the heads of women in countries like India and China.

But with some twisting and curling and combing and dyeing, by the time the hair leaves the store, it can look like the perfect fit for a lot of women's heads -- Hispanic, black, white.

Behind this process, however, are several global factors that have caused many changes to the business in recent years.

Hair extensions and weaves, for decades a part of the hair-care repertoire of black women, have become increasingly popular among other ethnic groups, along with a growing roster of celebrity clientele.

And the supply itself is changing, as women who used to have long, unprocessed hair perfect for extensions have started to change their styles.