I saw a difference after the third go. By the sixth go, it had really given my blonde tresses a boost. For you Sun-In fans, we hate to break it to you, but you might want to think twice. While it might seem like a natural method — hey, it says "sun" right in the name! — it's not actually a safe way to lighten hair. "That kind of product causes a chemical reaction with your hair. If you want to dye it later on, you have to remember that it will still be there and could cause damage later in the game," says Friedman. If you have been using a hair-lightening product before heading to the salon, fess up to your colorist to avoid breakage. Can’t Avoid Bleach? Take the Proper Precautions

Even some previously brassy streaks of blonde, hidden underneath the top layers of hair, had been lifted, too.

As a natural, medium-toned blonde, I have used Sun In products in the past, but that bright yellow spray often made your hair the same hue. Formulated with a winning blend of citrus and chamomile, John Frieda’s Lightening Spray will brighten your hair up to two shades, leaving you looking like you were kissed by the sun. For the best results, apply to wet hair and follow up with a blow dry and curling wand or flat iron. Hairdresser Brooke Evans of Brooke Evans Ironbridge salon, says: “Sometimes darker hair can be lifted at a low level – but using peroxide at home is risky, it can really damage your hair. If used incorrectly, there’s a big risk of damage.”

It comes down to how the sun affects melanin, which is the pigment that gives hair and skin color, says Dr. Annie Gonzalez, a board certified dermatologist at Riverchase Dermatology.Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We’ve all got it: a triangle of tresses on our private parts. Yes, we’re talking about pubic hair, folks. And there’s a wild tangle of info out there… READ MORE