Onion Juice for Hair Growth

Smiling woman with pretty long hair holding an onion and looking into the camera

Are you tired of spending money on expensive hair care products that don’t seem to work? If you’re looking for a natural and budget-friendly solution to promote healthy hair growth and you don’t mind that onion smell, you may consider giving onion juice a try.

Onion juice has long been used as a natural hair care remedy due to its high sulfur content, which is often associated with healthy hair growth. Sulfur is present in amino acids that are vital for the production of keratin, a protein that is essential for healthy and lustrous hair. In addition to sulfur, onion juice contains other nutrients like quercetin and kaempferol, which have antioxidant and anti-inflammatory properties that may help stimulate hair growth and prevent hair loss.


In this post, we’ll take a closer look at the science behind onion juice for hair growth and provide step-by-step instructions for how to use it at home. We’ll also discuss some other natural hair growth remedies and compare their effectiveness. By the end of this post, you’ll have a better understanding of how onion juice can help you achieve the luscious, healthy locks you’ve always wanted.

What is Onion Juice and How Does it Work for Hair Growth?

A clear glass of strained onion juice next to a bowl of chopped onions on a table

Onion juice is exactly what it sounds like – the juice extracted from onions. It can be made by grating or blending a raw onion and then straining the resulting mixture to remove any solids. The resulting liquid is a pale yellow or orange color and has a strong, pungent smell.


There is some scientific evidence to suggest that crude onion juice may an effective way for some people to prevent hair thinning and even regrow hair. One study published in the Journal of Dermatology found that when applied to the scalp, crude onion juice was able to improve hair growth and thickness in people with alopecia areata, a type of hair loss that results in patchy baldness.

How Does Onion Juice Boost Hair Growth?

One possible explanation for how an onion juice treatment can reduce hair thinning and boost hair growth is its high sulfur content. Sulfur is a mineral that is essential for the production of keratin, the protein that makes up the majority of hair, skin, and nails. Sulfur also helps to stimulate blood flow to the scalp, which can help to nourish the hair roots and promote healthy hair growth.


In addition to sulfur, onion juice contains other nutrients that may contribute to its hair growth-promoting effects. For example, onion juice is a rich source of quercetin, a flavonoid with antioxidant and anti-inflammatory properties. Quercetin may help to reduce inflammation in the scalp and stimulate the production of new hair cells. Onion juice is also a good source of kaempferol, another flavonoid with antioxidant and anti-inflammatory properties. Kaempferol may help to protect hair follicles from damage and promote healthy hair growth.

Onion Juice for Hair Growth Recipe

Using onion juice for hair growth is relatively simple and can be done at home with just a few ingredients and tools. There are very few commercial onion juice hair products on the market – so most people who are experimenting with this in their hair care routine resort to DIY onion juice remedies.


Here’s a step-by-step guide for how to use onion juice for hair growth:


  1. Choose a fresh, firm onion and wash it thoroughly to remove any dirt or pesticides.
  2. Grate or blend the onion to extract the juice. You can use a grater or a blender to do this. If using a blender, you may need to add a little cool water to help blend the onion into a smooth mixture.
  3. Strain the juice through a fine-mesh sieve or cheesecloth to remove any solids. You should be left with a pale yellow or orange liquid.
  4. Apply the onion juice to your scalp and hair. You can do this using a dropper or cotton balls. Gently massage the juice into your scalp for a few minutes to help stimulate blood flow and encourage hair growth.
  5. Leave the onion juice on your scalp for about 30 minutes.
  6. Rinse the onion juice out of your hair using lukewarm water and a mild shampoo. Avoid using hot water, as this can cause the onion juice to penetrate deeper into the scalp, leading to increased irritation.
  7. Participants in this study applied onion juice to their scalp twice per day as a treatment for alopecia areata.

It’s important to note that onion juice can have a strong smell, which may linger even after you’ve washed it out of your hair. Some people find that the onion smell can be overwhelming, so you may want to consider using a conditioner or a few drops of essential oil to help mask the scent. Additionally, onion juice may cause skin irritation in some people, especially those with sensitive skin. If you experience any redness, itching, or burning after using onion juice, stop using it immediately and consult a healthcare provider.

Onion Juice Affects on Hair Follicles

close up photo of the back of a woman's hair covered in shampoo in the shower

One of the primary ways that onion juice stimulates hair growth is by increasing blood circulation to the scalp. Onion juice contains sulfur, which is believed to help improve circulation to the hair roots, which may help with improving hair quality.


In addition to increasing blood circulation, onion juice is also thought to have an antibacterial effect on the scalp. This can help to kill off any bacteria or fungi that may be hindering hair growth. Onion juice is also rich in antioxidants, which can help to protect the hair follicles from damage caused by free radicals.


Overall, the sulfur and other nutrients found in onion juice may help to nourish the hair follicles, improve circulation to the scalp, and protect the hair from damage, leading to healthier and stronger hair growth. While more research is needed to fully understand the mechanisms behind onion juice’s effects on hair growth, many people have reported positive results when using it as a natural hair loss treatment.

Onion Juice for Scalp Health

In addition to its potential effects on hair regrowth, onion juice may also be beneficial for scalp health, including fighting off scalp infections. This again relates to the sulfur in onion juice, a mineral with known antifungal and antibacterial properties, as well as keratolytic activity.


In the past, sulfur has been widely used to treat a variety of dermatological disorders such as acne, rosacea, seborrheic dermatitis, dandruff, pityriasis versicolor, scabies, and warts. Its antimicrobial properties make it effective in combating bacteria and fungi that can cause these skin conditions.


Sulfur is also a keratolytic agent, meaning it helps to soften and break down excess keratin on the skin’s surface. This can be beneficial for those with dandruff, as excess keratin can contribute to the formation of dandruff flakes.

Other Natural Hair Growth Remedies

In addition to onion juice, there are several other natural remedies that may help promote hair health. Some of the most popular options include:

Coconut Oil

Coconut oil is a rich source of fatty acids and other nutrients that may help to nourish the hair and scalp.

Castor Oil

Like coconut oil, castor oil is rich in fatty acids and other nutrients that may help nourish hair follicles. It is also high in ricinoleic acid, an Omega-9 fatty acid that has anti-inflammatory and analgesic properties.

Aloe Vera

Aloe vera is a plant with a long history of use in traditional medicine. It is rich in antioxidants and has anti-inflammatory and moisturizing properties.

Apple Cider Vinegar

Apple cider vinegar is a popular natural remedy for a variety of hair and scalp concerns. It is rich in acetic acid, which has antimicrobial and pH balancing properties. This study combined apple cider vinegar with garlic oil and minoxidil to use as a hair loss treatment for patients with alopecia areata.

Potato Juice

Potato juice is a relatively less well-known natural remedy for hair growth, but it does contain several nutrients that may be beneficial for the hair and scalp. Potato juice is rich in vitamins A, C, and B6, as well as minerals like potassium and iron. This Japanese Study demonstrated that the oil derived from Sweet potatoes was able to stimulate hair regrowth in mice.

Olive Oil

Olive oil is a popular natural remedy for hair growth due to its rich nutrient profile and moisturizing properties. It is a good source of monounsaturated fatty acids, vitamins E and K, and antioxidants, which can help to nourish the hair and scalp. When applied to the hair and scalp, olive oil may help to improve hair’s elasticity, reduce breakage, and promote healthy hair growth. This 2004 study published in the peer-reviewed journal PLOS One demonstrated that olive oil stimulated hair regrowth in mice.


Each of these natural remedies has its own set of benefits and drawbacks, and what works for one person may not work for another. It’s important to consider your own hair type and needs when deciding which remedy to try.


If you’re interested in incorporating natural remedies including onion juice for hair into your routine, it’s a good idea to start with small amounts and gradually increase the frequency and quantity as needed. As with any new product or treatment, it’s important to pay attention to how your hair and scalp react and adjust your routine accordingly. Most importantly, discuss your efforts for boosting hair growth with a licensed healthcare professional.

Onion Juice vs. Prescription Medications for Promoting Hair Regrowth

woman's hand holding three pills

If you’re considering using onion juice to promote hair growth, you may be wondering how it compares to prescription medications that are commonly used for this purpose. Here is a brief overview of some of the key differences between the two options:

Mechanism of Action

Onion juice is believed to work by increasing blood circulation to the scalp and by providing the hair follicles with nutrients that are necessary for healthy growth. Prescription medications, on the other hand, typically work by inhibiting the production of certain hormones, including DHT, that can cause hair loss, or by stimulating the hair roots to enter the growth phase of the hair growth cycle.


Both onion juice and prescription medications have been shown to be effective in promoting hair growth in some individuals. However, the evidence for the effectiveness of onion juice is largely anecdotal, and more research is needed to determine its true efficacy. On the other hand topical treatment medications like Minoxidil have been extensively studied for decades with a long track record of success for a significant amount of patients experiencing certain types of hair loss.

Side Effects

In moderation, onion juice is generally considered to be a safe and well-tolerated treatment for hair loss, with few reported side effects aside from the onion juice smell. Prescription medications like oral finasteride, on the other hand, can cause a range of side effects, including gastrointestinal upset, skin irritation, and sexual dysfunction.


Onion juice is an extremely inexpensive treatment option, as it can be easily prepared at home using fresh onions. Prescription medications, on the other hand, can be quite expensive, especially if they are not covered by insurance.


Overall, onion juice and prescription medications are two potential options for treating hair issues, and the best choice will depend on an individual’s specific needs and preferences. It is important to discuss any treatment decisions with a healthcare provider to determine the most appropriate course of action.

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