Onion Oil For Hair Growth: A Complete Guide

Onion oil is a potent natural remedy used to stimulate hair growth and enhance scalp health. Rich in sulfur and antimicrobial properties, onion oil supports the production of collagen and keratin, the building blocks of healthy hair. Onion oil has become a popular remedy for hair growth and scalp health. Extracted directly from onions, onion oil for hair also has herbal and antimicrobial properties that support healthy hair and scalp. While effective for restoring hair texture and managing scalp infections, onion oil is not a cure for genetic baldness. 

Many who have used onion oil for hair growth and scalp-related problems have reported side effects; however, these are typically minimal, ranging from mild itching to scalp irritation due to the acidic nature of onions. Encouraging a healthy head of hair is not just about using a single ingredient; it is about consistency, which yields the best results. Although onion oil is not a one-stop solution or a cure for all hair and scalp problems, it is effective in restoring hair to its natural state. Read on to find out more about onion hair oil benefits, usage, side effects, and more.

What is onion hair oil? 

Onion oil is a topical hair product extracted from onions or onion bulbs by steam distillation, solvent extraction, or infusion with oils such as coconut or olive oil. It is designed to boost hair growth, strengthen hair follicles, and reduce hair fall.

Onion oil is rich in sulphur, which is a key element in the production of keratin – a protein which forms the structure of hair strands. Additionally, onion oil’s antioxidant properties improve the scalp environment with nutrients.

Benefits of onion oil for hair 

If you are using onion oil for hair growth, you may notice that it strengthens hair follicles and improves scalp health, but it cannot cure pattern baldness or reverse hair loss.

To ensure a healthy scalp, onion oil helps maintain and balance the pH of the scalp and hair roots. 

Read the table below to know what onion oil can and cannot do: 

Onion oil makes hair care easier because of its nutrient-rich composition. The antioxidants and flavonoids in onion oil boost blood flow to hair follicles and allow light to reflect for a more natural, glossy shine.

It also acts as a natural conditioner, reducing frizz and dryness and leaving hair smoother and easier to manage.  This can be done by applying it correctly and consistently over time.

How to use onion hair oil correctly 

Since onion oil is relatively lightweight and slightly sticky in nature, it aids scalp absorption fairly easily. Follow these steps to ensure your scalp and hair get the full benefits of onion oil: 

Step 1: Prepare the warm oil blend

• Warm the onion oil slightly before applying it directly to the scalp.

• Warm it by placing the onion oil container in warm to hot water for 10 minutes.

Step 2: Ensure your scalp is clean and dry

• A clean and dry scalp is the ideal condition for onion oil to work.

• This ensures maximum absorption in the scalp.  

Step 3: Massaging the oil into the scalp 

• Using just your fingertips, massage the warm oil into your scalp.  

• Apply the circular massage technique for 5 to 10 minutes and gently massage the oil across your entire scalp.

• Using fingernails to massage the scalp will cause scalp irritation and burning. 

Step 4: Let it sit for 2 hours or more

• Let it sit for a duration of 30 minutes to 2 hours.

• Best results have been observed when left overnight.   

To witness ideal improvement in hair strength and scalp health, onion oil should be used 2–3 times per week.

What is the best time to apply onion hair oil? 

Applying onion oil to your hair depends on factors, like contact time, pollution, and comfort levels.

The recommended time to apply onion oil to your hair is at night, as it allows the nutrients to penetrate the scalp.

Here are some key differences between daytime and nighttime applications:  

In general, it is recommended to apply onion oil during the night because:  

• Hair follicles are in repair mode during sleep hours. 

• Stress levels (cortisol) are lower.  

• Improved blood circulation during sleep because the body has a natural tendency to rejuvenate, repair, and recover.  

How long does onion hair oil take to show results?

Onion hair oil is not an overnight cure for hair thinning, hair fall, or shedding. It takes 3 to 6 months of consistent use (2-3 times per week) to show visible results. Some usage observations have shown a significant reduction in hair fall within the first 6 to 12 weeks. However, this takes months of consistent use.

Here are some key timelines you should be aware of:

• 1 to 2 weeks: Reduction in scalp itchiness.
• 3 to 6 weeks: Hair shedding decreases.
• 6 to 8 weeks: Improvement in hair texture and decrease in hair fall.
• 3 to 6 months: Noticeable changes in hair weightage, thickness, and shine.

It is important to note that onion hair oil benefits individuals seeking to improve the shine and texture of their hair. 

Best onion hair oil/juice combinations 

Onion oil works with a variety of carrier oils. These provide the best results and can also be implemented as popular home remedies.  

Here are some of the best onion oil combinations for specific hair needs:  

• Coconut oil is useful for hair nourishment.  
  
  This works best when coconut oil and onion juice (not onion oil) are mixed in equal parts and then massaged into the scalp.
  
  The moisturising properties of coconut oil help relieve scalp dryness and itchiness.
    

• Castor oil contains 90% ricinoleic acid, which is anti-inflammatory and antimicrobial.  

A combination of castor oil and onion oil is rich in sulphur and antioxidants, which stimulate hair growth and strengthen hair follicles. 

• Rosemary oil, coupled with onion oil/juice, is a popular natural remedy for hair fall, thinning, and scalp health. 
  
  

• Aloe vera, with onion oil/juice, is a powerful remedy that soothes scalp irritation, itching, and redness. 
  
  Aloe vera’s natural cooling properties prevent the burning sensation on the scalp caused by onion oil/juice.

How to make onion oil for hair at home

Onion oil is an affordable and natural solution for your hair and scalp troubles.

To make it at home, get these ingredients together:

• Medium-sized red onions x 2
• Coconut oil x 1 cup

Some optional items to add:

• Methi seeds, curry leaves, or rosemary oil

Making onion hair oil at home

Making onion hair oil at home isn't exactly rocket science. Here’s what you need to do to get a good oil blend:

1. First peel and then finely chop the onions.
Then, blend the chopped onions into a paste and strain to extract the juice.

2. Pan-heat the carrier oil (let's assume coconut oil) on a low flame.

3. Mix and stir the coconut oil with the onion juice.

4. Turn off the heat and let the mixture cool at room temperature.

5. Strain off excess residue. 

6. Store the mixture/blend in a cool and dry place. 

7. Use within 3 weeks to avoid any spoilage.

Side effects of onion oil on hair  

Onion oil is a great natural remedy for scalp health, but because of its high sulphur content, it can cause side effects, like skin irritation, itching, redness, and has a particularly strong odour.   

If used excessively, it can clog follicles and hair roots. This will prevent hair from growing.  

When mixed with other carrier oils, if it is not washed thoroughly, expect an increase in oil buildup on the scalp, excess fungal growth, and increased itching and white flakes.  

Due to its acidic nature, if left on for too long, it may clog pores around the forehead and back of the neck, ultimately leading to acne.  

Other temporary side effects may include sudden hair shedding in the initial phases of usage, mostly due to the inflammation of the roots, which causes hair to be pushed out of the follicle prematurely.  

Who should avoid onion hair oil? 

Onion oil is a great natural remedy for those looking to add to their current treatment of hair loss, and for individuals seeking better scalp health and thicker hair.
However, here is who should avoid using onion hair oil

• Individuals with sensitive/reactive scalps.
• People with pre-existing scalp and skin conditions, like psoriasis, eczema, and dermatitis. 
• Persons with open wounds, acne, skin infections, and recent cuts. 
• Anyone with high scalp heat. 
• Anyone allergic to onions should avoid using onion hair oil. 
• Patients who have recently undergone a hair transplant.  

Frequently Asked Questions

1. Can I leave onion hair oil overnight?

Yes, this will not cause problems. Leaving onion oil on your scalp overnight helps it absorb all its nutrients.

However, if you suffer from a sensitive, oily, or itchy scalp, you should avoid using onion oil.

2. Can I use onion hair oil daily?

Onion oil is excellent for stimulating hair growth and improving scalp health. Its recommended frequency of usage is 2 to 3 times per week. 

3. Does onion hair oil thicken hair?

Onion oil thickens hair directly by reducing hair breakage, strengthening hair follicles strong, and boosting scalp circulation. 

4. Will onion hair oil make my hair smell?

Yes, onion oil will make your hair smell only when applied. This happens due to its high sulphur content. The only other instance of hair odour may occur when the hair is not washed properly after applying onion oil or juice. 

5. Can onion oil regrow hair? 

Onion oil may help reduce hair fall, improve hair thickness, and shine. Since the evidence is limited, it is not a guaranteed cure for hair loss. 

References

1. https://www.rjpponline.org/HTML_Papers/Research%20Journal%20of%20Pharmacognosy%20and%20Phytochemistry__PID__2025-17-1-5.html
2. https://pubmed.ncbi.nlm.nih.gov/12126069/
3. https://www.medicalnewstoday.com/articles/319515
4. https://wjpr.s3.ap-south-1.amazonaws.com/article_issue/350f1a9ef200a69e78ba40be1dc062da.pdf
5. https://ijprajournal.com/issue_dcp/A%20Review:%20onion%20Allium%20cepa.pdf

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