The ultimate guide to hair oils for hair growth, including their exact benefits, how to use them, and the products the pros swear by for long, lush strands.

Another theory, she says, revolves around rosemary oil’s anti-inflammatory and antimicrobial properties, which could possibly help support a “healthy scalp environment.” (An inflamed scalp can weaken hair follicles and potentially result in shedding.)

It's tempting to believe the hype about castor oil, but it's worth digging a little deeper first. Is this humble product as powerful as people suggest? Can it really regrow hair when applied topically — and if so,

Rapunzel, is that you?