Are onions the secret to luscious eyebrows?

Raise your hand if you want Cara Delevingne brows.

According to one beauty blogger, the solution is something you probably have sitting in your kitchen: Onions.

In a recent Instagram post, blogger Huda Kattan (of the hugely popular site HudaBeauty) posted a video of fellow beauty blogger Farah Dhukai rubbing raw onions all over her eyebrows.

“Onion juice has sulphur which speeds up the growth of hair and makes it thicker,” Kattan writes in the caption, recommending those wanting faster-growing brows massage the onion juice onto their brows for five minutes, let it dry completely and then wash it off with cold water.

Now, HudaBeauty has let us in on a ton of beauty secrets – but is this one of them? Well, kind of.

ALSO SEE: Watch: How to fill in your eyebrows

Dermatologist Kavita Mariwalla tells Allure that sulphur has been proven to aid in hair growth, although not for brows specifically.

“Sulphur is important in hair, however applying onion juice does not mean that the sulfur is incorporated into the hair strand. Rather, the sulphur acts as a natural anti-inflammatory,” she tells the magazine. “Scientists tested onion juice for alopecia areata in a 2002 Journal of Dermatology article and had women apply onion juice to the scalp. Those that did that had better hair regrowth than those who used tap water alone. But the reason the onion juice worked on these women is because some of the alopecia was a result of seborrheic dermatitis that was causing inflammation on the scalp, and sulphur in the onion juice is anti-bacterial and can lessen that.”

She goes on to say that the reason for thin/sparse brows is often overplucking or waxing – so the onions may not make a huge difference.

ALSO SEE: Lacking full brows? Fake it with grooming products

However, she says there’s no harm in trying, as long as you’re careful not to get the juice in your eyes. And she says you would have to do the process daily for at least two weeks before any results would be noticeable.

But if onions already make you cry when you’re making dinner, what about if you get them in your eyes?

“Onions contain enzymes that can cause tearing, inflammation, and burning of the eyes, so putting onion juice in close proximity to your eyes can lead to these symptoms because the enzymes in the onion can travel through the air and don’t need to come in direct contact with your eyes to cause the pain and discomfort,” optometrist Nicole Sangani tells Allure. “There’s limited medical evidence confirming the actual physiologic effects or long-term damage from getting onion juice in your eyes, so it would be advisable to avoid this method or be very careful not to allow the onion to come in direct contact with your eyes.”

Maybe it’s best to stick to your brow filler for the time being.

Would you try onions on your eyebrows? Let us know by tweeting @YahooStyleCA.