Can Onion Water Truly Boost Hair Growth? Scientific Insights Revealed

In the quest for stronger, healthier, and shinier hair, people try a variety of unconventional remedies. From apple cider vinegar rinses to beer treatments, the list is endless. But have you ever considered onion water? Advocates swear by its ability to enhance hair growth and fortify strands. But is this kitchen concoction truly effective? We turned to experts to uncover the truth.

SEE ALSO: 15 Essential Foods for Promoting Hair Growth, Strength, and Overall Health

Advantages of Using Onion Water for Hair

To prepare onion water, simply soak chopped raw onions in a container of water. Over time, the water absorbs the onion's juices, which are packed with sulfur, flavonoids, and antioxidants. This nutrient-rich liquid is then applied directly to the scalp and hair.

According to Brendan Camp, MD, FAAD, a board-certified dermatologist at MDCS Dermatology in New York City, onion water may enhance hair strength and appearance by maintaining scalp and follicle health while protecting against oxidative stress.

Candace Spann, MD, FAAD, a board-certified dermatologist based in Las Vegas, highlights additional scalp benefits. She explains that the sulfates in onion water can alleviate scalp dermatitis, reduce itchiness, and potentially stimulate hair growth.

While the effectiveness of onion water for significant hair growth remains debated, some studies suggest it can boost blood circulation to the scalp. A 2002 review found that nearly 87% of individuals with alopecia areata experienced hair regrowth after applying onion water twice daily. However, quercetin, a flavonoid in onions, though known to enhance blood flow, does not influence hormones like DHT, making it ineffective for treating pattern baldness.

In summary, while onion water for hair is an intriguing concept with potential benefits, there isn’t enough evidence to declare it the most effective method for hair growth, especially compared to FDA-approved treatments like minoxidil. That said, it’s worth trying if you’re interested in natural remedies for hair growth.

Potential Side Effects of Applying Onion Water to Hair 

DIY beauty treatments can pose risks to your skin and hair. Professionally developed products are carefully formulated with precise ingredient concentrations and preservatives to prevent harmful bacteria growth.

Nathan Newman, MD, FAAD, a board-certified dermatologist and cosmetic surgeon, warns that DIY solutions are often highly concentrated and may lead to adverse reactions such as scalp irritation, redness, itching, or rashes.

Another notable downside is the strong odor. Dr. Newman also points out that frequent use of onion juice could cause temporary hair discoloration, particularly in individuals with lighter hair, potentially resulting in a yellowish tint.

Key Considerations Before Using Onion Water for Hair Growth

If you’re intrigued by the idea of using onion water, Korab mentions that there are hair care products available that contain onion water, extract (allium cepa extract), or juice. These products are often blended with additional nourishing ingredients, offering a balanced formula that combines the benefits of onions with other elements to improve overall hair health.

However, if you’re dealing with significant hair loss and want effective solutions, products containing minoxidil or finasteride are your best options. These ingredients are supported by extensive scientific research demonstrating their effectiveness.

Dr. Spann explains, "Minoxidil is the only FDA-approved topical treatment for hair loss. Topical finasteride has also shown promising results for some individuals." Dr. Camp also recommends ketoconazole shampoo, which can address dandruff, promoting a healthier scalp and, in turn, stronger, shinier hair.

For those experiencing persistent hair loss or scalp issues, Dr. Newman advises consulting a dermatologist. "It’s crucial to identify the underlying causes of hair loss, which can range from hormonal imbalances to autoimmune conditions or infections. A dermatologist can provide tailored medical treatments to address these issues effectively," he says.