COLLAGEN TREATMENT —the protein that helps strengthen hair to prevent breakage, heat damage, and frizz—is vitally important for maintaining strong and healthy hair.

Keratin treatments have generated a lot of buzz in the last few years, and not necessarily for a great reason: The salon service that turns frizzy, curly strands into miraculously silky hair is (downside) often made with formaldehyde. And while we can debate all day long about whether it's safe to use, it all boils down to what you think is worth it and if you trust the stylist and salon behind the service. .