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Featured Image Credit: Instagram/@iamcardib
The singer, 29, shared a photo of her hair on Instagram, followed by a video of it looking super sleek and long.
She wrote: "My last 2 washes I been boiling onions and using the water to wash my hair. I used to do this 6 years ago when I started my healthy hair growth journey.
"I stopped cause I got really lazy. It's odorless and I notice that it’s been giving a shine to my hair."
Fans and followers were stunned by the post, with one person commenting: "I used to do that too."
Meanwhile, another said: "Wow. So many tricks! I’m doing my wash this weekend."
And a third added: "Let me put a pot of onions on rn."
Another wrote: "Your hair has grown so much sis! it looks so healthy and beautiful."
Meanwhile, the official Instagram account added: "If cardi washes her hair with onion water, we wash our hair with onion water."
But a sixth pointed out: "I have to try boiling the onions .. I was juicing them and left it too long .. & for an entire year, anytime my hair was blowed out or straightened it smelled like Sofrito."
According to information on Healthline about using onion juice on your hair, researchers have found that "the anti-inflammatory and antimicrobial properties of onions may help you grow your hair or enhance its healthy appearance".
According to a 2018 study in the Journal of Drug Delivery and Therapeutics, researchers created an onion shampoo by combining onion extract to a natural shampoo of coconut, castor, eucalyptus oils and cleansers.
They said that when it was applied to the scalp for five minutes, not only did it not cause irritation, but it also promoted hair growth and moisturised dry hair and scalp.
Before trying any new techniques on your hair, it's best to seek the advice of a professional.
In other hair news, we recently told you about the woman who was left 'ugly crying' over her new hair 'do.
TikToker @rosaamazapan explained that visiting the hair salon was supposed to be a special treat after she had finished an exam.
But the style certainly wasn't what she expected, taking to the video streaming platform to explain she was left 'ugly crying' at the results.
She said: "Sorry for the ugly crying and the cussing but mostly sorry for letting you guys see this terrible haircut!"
You can read more on that here.