6 Side Effects Of Onion Juice On Hair

onion juice side effect on hair
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Are there any side effects of onion juice on hair? Yes, there are definitely side effects of using onion juice on hair although this depends on how potent the concoction you made is. While onion juice is effective in preventing hair loss issues, it can also cause an itchy scalp, burning sensation, or leave a terrible odor in your hair.

There have been so many questions concerning how viable onion juice is for your hair. Does it have some side effects? The simple answer is yes, Onion juice contains a great level of vitamin A and also some dietary fibers, many antioxidants, and sulfur but the uninteresting part of these theories is that these can be unhealthy for your scalp when in excess.

Onion juice can actually be a really good way to grow your hair, Onion juice contains collagen that will help grow your hair really fast but like the saying goes thus; Every advantage comes also with some disadvantages.

Due to how fast this collagen in onion juice operates in your hair, these are some notable side effects of onion juice on your hair to take note of.

Onion Juice On Hair Explained

Onions have a long and very interesting history extending to all parts of the body. Onion juice has been used for years by Eastern and Western origins to promote oral health, osteoporosis Promotes healthy hair and skin.

Onion juice is believed to be a sure and effective way to boost your hair’s health. It helps promote hair regrowth and just like eating raw onions, it helps in boosting the level of antioxidant enzyme catalyze. Onion juice contains vitamins, minerals, and other essential nutrients that nourish your hair follicles however there are ways onion juice needs to be used to avoid side effects.

Using onion juice for hair is mostly safe but if you do have an allergy to onions then there are side effects to watch out for. When onion juice is added to hair, it can provide your hair follicles extra sulfur which in turn promotes collagen production.

Before you conclude on the negative results of onion juice, keep in mind that this only happens from excess or wrong usage. Onions are packed full of essential nutrients for hair and it is often used as hair growth remedy.

Here are some of the positive results from using onion juice correctly;

  • Hair strengthening
  • Prevents dandruff and hair loss
  • Increases hair volume
  • Better circulation
  • Improves hair growth
  • Increases shine.

But this post is not about the benefits of using onion juice for hair. This article is all about the disadvantages of using onion juice for hair.

6 Side Effects Of Onion Juice On Hair

Onions can indeed restore dry-damaged hair and it is often recommended as a natural alternative to hair loss products but some safety homemade rules need to be in place to avoid side effects. Before directly adding this hair care secret to your beauty routine, here are side effects that can be caused by incorrect usage.

1. May Cause Itchy Scalp

Nothing irritates more than having to scratch your hair consistently, Due to the level of sulfur contained in the onion itself, irritation to the scalp will occur if your hair is not properly washed after applying the onion juice.

Growing a long hair with onion juice is a good prospect but it is advisable to wash it from your hair thoroughly and do not use consistently, ensure it is once or twice in a week and make sure it is well blended.

2. May leave a Horrible Odour Behind

Onion Juice For Hair
Source: Pinterest

As great as onion juice is for your hair, the smell can be a total turn off.

After blending the onion, the advisable method is to use immediately because if stored for a while before using on your hair, it might lead to your hair itself smelling really bad even after washing off and this happens as a result of the level of collagen in it.

3. Burning Sensation

A burning sensation is one of the disadvantages of using onion juice on the hair.

Regular usage should totally be scratched if you do not want a burning scalp. Onion juice is not going to give you the desired result if used regularly, it will only burn the scalp.

Constant use of onion juice will give you a wound on your scalp and if proper care is not ensured, this might lead to an infection and most people have a sensitive scalp which might be worst. Possibly look for other remedies that might grow your hair.

4. May Cause Hair Loss

side effects of nonion juice

One of the side effects of onion juice on hair is that it may cause hair loss. Ironic right? A solution for hair growth causing hair loss. Well here’s how.

If your hair is really sensitive then you might want to avoid onion juice totally. Onion juice can be of more damage to the hair than nourishing it, Having hair loss is the total reversal of what you would have wanted so you can stick to essential oil to grow your hair.

5. Gives Scalp Eczema

The sulfur contained in onion juice will eventually dry out the oil that moisturizes your hair and this will lead to scalp eczema.

This is one major side effects of onion juice that should be considered before using it. Scalp Eczema happens after a lot of itching might have taken place.

6. Can Dry Out The Scalp

There are many side effects of using onion juice on hair, developing a dry scalp is one of them.

While adding onion juice to your hair care routine can easily restore your hair strength, using it without any emollient as aloe vera can easily cause it to dry out your hair. If you have a really sensitive scalp you should be sure to use a nourishing conditioner and avoid using it too often.

Excess use of onion juice can easily strip your hair of nutrients and lockout moisture thereby drying out your hair. It also contains sulfur which when in high concentration can dry out hair and strip it of its natural oil.


Is onion juice harmful to hair?

Onion juice is considered safe enough for hair provided it’s not used in excess. However, if you have an allergy to onions then you shouldn’t use onion juice on your hair. Onion juice should be used in moderation and better mixed with an emollient to avoid irritation.

What can I mix with onion juice for hair growth?

Onion juice used alone can easily irritate your scalp hence it’s best mixed with essential oils and soothing agents such as honey, coconut oil, olive oil, aloe vera, or tea tree oil.

Can I apply onion juice overnight?

Yes, you can choose to leave onion juice in your hair overnight and have it washed in the morning. This will give your hair enough time to benefit from it but is important to do a patch test for few minutes to make sure there is no irritation before using overnight.

Can I apply onion juice daily?

Yes, it’s fine to use onion juice daily but you should avoid applying plain onion juice directly to your scalp and hair. It is best to have it mixed with coconut oil or olive oil to help retain moisture.

How do you get rid of the smell of onion juice out of your hair?

The smell of onion juice might be a bit difficult to get rid of from your hair. However, experts recommend washing your hair with citrus shampoo with essential oil as part of its ingredients. After shampooing, take half a lemon and squeeze inside water and use as a final rinse.

Can I mix onion juice with coconut oil for hair?

Yes, onion juice can be mixed with any carrier oil for hair growth. Mixing onion juice wit coconut oil provides your hair with double benefits and coconut oil has amazing anti-bacteria properties that helps prevent itching and any side effects of using onion juice.

Can I leave onion juice on my hair for a week?

Yes, you can leave onion juice in your hair for as long as you want if you can bear the smell and don’t have sensitive skin on the scalp.

Does onion juice fade hair color?

Onion juice can help increase catalase which is an enzyme that can naturally help darken your hair. However, it can help reverse grey hair and also treat thin hair.

Does onion juice have side effects on hair?

Yes! As discussed above, onion juice can irritate the skin on your scalp thereby causing reactions such as itching, dandruff, hair loss, dry scalp, eczema, and dry hair.

How often should onion juice be applied to hair?

If you can tolerate the smell of onion juice for a long then it should be used 3 times a week. Leave it in for 30 minutes or longer if you can tolerate the smell and then wash it off.

Final Thoughts

Onion juice has its benefits and so do its side effects. You can try adding honey to your onion juice to help reduce its potency or rather use essential oil to grow your hair. See how to grow your hairline using onion juice.

Read more hair care tips on our site:


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