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Episode
Onion Juice for Extreme Hair Growth: Stop Hair Loss
~8 min
Episode Brief·YouTube

Onion Juice for Extreme Hair Growth: Stop Hair Loss

Eric Berg
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TL;DR

The four things you'd lose by not watching

4 items

TL;DR

The four things you'd lose by not watching

4 items
1

Apply fresh organic red onion juice to your scalp twice a week, leaving it on for 30–60 minutes before double-shampooing; in one study, this led to significant hair regrowth in 86.9% of users within 6 weeks.

2

Add 5 drops of rosemary oil to the onion juice for enhanced results — a 2015 randomized trial found rosemary oil alone was as effective as a leading alopecia medication.

3

For a supercharged version, ferment the onion slurry with water, sea salt, and raw honey for 72 hours to boost quercetin content, create additional vitamins, and lower pH to a scalp-friendly ~5.

4

Support the treatment with 10,000–20,000 IU of vitamin D3 daily, as the speaker highlights multiple mechanisms linking vitamin D to hair growth.

Protocols

Concrete recipes — what, when, how much, and why

4 items

Basic Onion Juice Scalp Treatment

WhatExtract juice from one organic red onion (highest in quercetin) by chopping, blending, and straining through cheesecloth. In the shower, wet hair, massage the juice into scalp and hair for a couple of minutes, then leave on for 30 minutes (speaker recommends 1 hour) under a shower cap. Rinse and shampoo twice to eliminate odor. Repeat twice weekly for 4–6 weeks.
WhenTwice a week, during shower routine. Expect to see initial hair growth around week 3 or 4.
DoseLeave on for 30 minutes (speaker personally recommends up to 1 hour). Use twice a week for a minimum of 4–6 weeks.
For whomAnyone experiencing hair loss or thinning, including alopecia areata (patchy hair loss), nutritional deficiencies, or scalp issues like dandruff and fungal overgrowth.
WhyOnion juice supplies sulfur for keratin construction and high levels of quercetin, which suppresses autoimmune T-cell attacks on follicles, increases growth hormones in the hair root, and acts as an antimicrobial against scalp yeast, fungus, and dandruff.
CaveatsOnion odor is a concern but is fully removable by shampooing twice after treatment. Stick to twice weekly to avoid scalp irritation. The speaker emphasizes using organic red onion for maximum quercetin.

The speaker describes a straightforward DIY protocol using a single organic red onion per application. After blending and straining, the liquid is applied to wet hair and massaged into the roots. He personally advises waiting 1 hour instead of 30 minutes for deeper penetration. He then instructs rinsing and shampooing hair twice, asserting that this removes any lingering onion smell. A clinical study he cites backs the approach: an 86.9% regrowth rate in 6 weeks. The treatment is presented as a practical, low-cost option that works across multiple hair loss types — from autoimmune to infectious to nutritional — making it accessible for a broad audience.

Mechanism

Sulfur is a raw material for keratin, the primary structural protein of hair. Quercetin ('corsetin') helps block autoimmune T-cell attacks on hair follicles — particularly relevant in alopecia areata — and stimulates growth hormones at the follicle root. Additionally, quercetin's antimicrobial properties combat Malassezia yeast, fungus, and mold that can contribute to scalp inflammation and hair shedding.

Personal experience

The speaker states: 'I would personally recommend to leave it in your hair for 1 hour.'

Take one onion, chop it into small pieces, put it into the blender, and blend it down. Then you're going to take the blended slurry and put it through a cheesecloth so you can separate out the liquid into a container.

Also said
“Onions have the highest amount of corsetin. Corsetin is going to help your hair. One of the biggest things that corsetin does is it helps suppress this autoimmune attack tea cell uh situation.”— Explains why red onion specifically is chosen and its key active compound.
“corsetin helps increase the growth hormones of the hair follicle which is right at the root of the hair itself.”— Direct mechanism on follicle stimulation.
“corsetin is a powerful antimicrobial protecting your scalp against overgrowth of yeast, fungus, mold, and if you also have dandruff or some other problems going on the scalp, that can help you as well.”— Broadens the use case to scalp infections and dandruff.

Rosemary Oil Addition

WhatAdd 5 drops of rosemary oil to the prepared onion juice before application. Follow the same application and rinse routine as the basic treatment.
WhenEvery time you prepare the onion juice for your twice-weekly session.
Dose5 drops of rosemary oil per batch of onion juice.
For whomEspecially those with autoimmune-hair loss or anyone wanting to maximize the onion juice protocol's effectiveness.
WhyRosemary oil is an anti-inflammatory, antioxidant, and circulation booster; a 2015 RCT found it to be as effective as a leading alopecia medication. It is particularly good for autoimmune-related hair loss.
CaveatsNo specific caveats mentioned beyond performing a patch test for skin sensitivity.

The speaker positions the rosemary oil addition as the first 'next level' tweak. He mentions the 2015 randomized trial that compared rosemary oil to a top medication for alopecia, finding both equally effective. He emphasizes rosemary's suitability for autoimmune conditions, which complements onion's quercetin-mediated immune suppression. The combination creates a two-pronged natural approach: onion builds keratin and calms autoimmunity, while rosemary enhances circulation and fights inflammation.

Mechanism

Rosemary oil contains phytonutrients that increase blood flow to the scalp, reduce oxidative stress, and modulate inflammation — all of which support the hair follicle environment. The 2015 trial suggests its effect is comparable to minoxidil (a vasodilator), but through a broader anti-inflammatory and antioxidant pathway.

You're going to be adding five drops of rosemary oil.

Also said
“In a randomized trial in 2015, they compared rosemary oil to one of the top medications for alipcia. And they found rosemary by itself was as effective as this medication.”— Supports the efficacy claim with a direct pharmaceutical comparison.

Fermented Onion Juice Supercharged Treatment

WhatPrepare a fermented onion liquor: blend one peeled, chopped onion, strain out the pulp, and place slurry in a mason jar with 8 oz water, 1 teaspoon sea salt, and ½ teaspoon raw honey. Cover with cheesecloth and let ferment at room temperature for 72 hours (bubbles appear on day 2). Strain the liquid and apply same as the basic treatment: massage into wet hair/scalp, leave 1 hour, rinse and shampoo twice. Use twice weekly for at least 6 weeks.
WhenTwice a week. Fermentation takes 72 hours before first use, so prepare ahead.
DoseFerment for exactly 72 hours; leave on hair for 1 hour. Use twice weekly for 6 weeks or longer.
For whomThose who want to intensify the onion juice protocol, especially if they have stubborn hair loss or want to accelerate results.
WhyFermentation enhances quercetin bioavailability, allows microbes to synthesize additional vitamins, and lowers the pH to ~5, which the speaker claims is therapeutic for the scalp. This magnifies the original onion juice benefits.
CaveatsEnsure clean fermentation setup to avoid contamination. The mixture should be strained again after fermentation. Odor removal still requires double shampooing.

This protocol is the 'supercharged' upgrade. The speaker details a simple lacto-fermentation that mimics traditional probiotic preparations. He notes that by day two, tiny CO2 bubbles reveal active fermentation. The original onion juice benefits (sulfur for keratin, quercetin for autoimmunity and growth hormone stimulation, antimicrobial action) are purportedly heightened. He frames it as 'magnifying' the remedy, with the acidic pH adding a scalp-therapy dimension. The application method remains identical to the basic protocol, so the added effort is entirely in the preparation stage.

Mechanism

The speaker explains that fermentation amplifies the quercetin content (corsetin) and creates new vitamins via microbial action. The resultant pH of 5 is described as 'therapeutic' for the scalp, potentially improving the skin barrier and creating an unfavorable environment for pathogens. The CO2 bubbles indicate active fermentation, confirming the biological transformation of the ingredients.

So now let's supercharge this recipe and take it to the next level. You're basically going to enhance the onion juice. Now how do you do that? You're going to ferment it.

Also said
“then you're gonna add a 8 oz cup of water. And then you're gonna take a teaspoon of sea salt. Then you're gonna add a half a teaspoon of raw honey.”— Specifics of the fermentation medium.
“the pH of the onion juice is gonna be becoming more acidic to about five, which is gonna be very therapeutic to your scalp.”— Quantifies the pH change and its proposed benefit.

Vitamin D3 Supplementation for Hair Growth

WhatTake 10,000 to 20,000 IU of vitamin D3 daily, or get ample sun exposure.
WhenDaily, as an ongoing support for hair health.
Dose10,000–20,000 IU per day.
For whomAnyone experiencing hair loss; especially those with low sun exposure.
WhyVitamin D is involved in multiple mechanisms of hair growth and deficiency is linked to hair loss.
CaveatsHigh doses of vitamin D3 should ideally be monitored by a healthcare provider; no specific brands mentioned.

Towards the end of the video, the speaker briefly but emphatically recommends vitamin D3 intake as a key supporting factor. He directly instructs viewers to take at least 10,000 or 20,000 IUs of vitamin D3 every day, or to get a good amount of sun. This is not a standalone hair loss treatment but an essential nutrient piece that the speaker frames as critical, implying that even the topical onion protocols will work better when vitamin D levels are replete.

Mechanism

The speaker does not detail the mechanisms but asserts there are 'so many different mechanisms involved with vitamin D in hair growth or loss of hair.'

There's so many different mechanisms involved with vitamin D in hair growth or loss of hair that you should be taking at least 10,000 or 20,000 IUs of vitamin D3 every day or get a good amount of sun.

What's new

Personal practice updates, fresh positions, predictions

3 items

Onion Juice Hair Regrowth Study

A dermatology journal study showed 86.9% of participants using onion juice for 6 weeks experienced significant hair regrowth, versus only 13% in the water-only group.

Why this matters: Provides strong clinical backing for a cheap, DIY remedy, challenging the assumption that only pharmaceuticals can produce such results.

Background

Onion juice has been anecdotally used for hair loss, but this study offers rigorous data that may surprise skeptics. The speaker also mentions a separate mouse study where quercetin alone regenerated hair in all treated subjects.

The speaker cites a study from the Journal of Dermatology that split participants into two groups: one applied onion juice to their hair, the other just water. Within 6 weeks, the onion juice group had an 86.9% rate of significant hair regrowth, while the water group only saw 13%. The speaker interprets this as robust evidence for onion juice efficacy. He also references a mouse study where quercetin — the key flavonoid in onion — regenerated hair in all treated animals, while untreated mice had no regrowth. Together, these findings frame onion juice as a low-cost, high-impact intervention that works across different mechanisms, not just a folk remedy.

So in a study in the journal of dermatology, they split this group in half and half of the group did onion juice on their hair and the other half just did water. And just within 6 weeks, the group that used the onion juice had an 86.9% result. And when I talk about results, I'm talking about significant hair regrowth.

Also said
“There was another study on mice. the group that used the corsetin and they actually did separate out just the corsetin from the onion showed regeneration of the hair in all of the treated groups and in the untreated groups there was no regrowth of hair.”— Adds animal model evidence isolating quercetin as the active compound.

Rosemary Oil Enhancement

Adding 5 drops of rosemary oil to the onion juice creates a synergistic treatment; a 2015 trial found rosemary oil alone was as effective as a leading hair loss medication.

Why this matters: Offers a natural alternative that matches a pharmaceutical's efficacy, making the DIY protocol even more compelling for those seeking non-drug solutions.

Background

While onion juice is effective on its own, the speaker introduces rosemary oil as a complementary ingredient that can 'take your results to the next level'. Rosemary oil has its own body of evidence, including the 2015 comparative trial against minoxidil for androgenetic alopecia.

The speaker suggests adding exactly five drops of rosemary oil to the prepared onion juice. He supports this with a 2015 randomized trial that compared rosemary oil directly to one of the top medications for alopecia (typically minoxidil). The trial found that rosemary oil was as effective as the medication. He explains that rosemary oil contains anti-inflammatory and antioxidant phytonutrients, stimulates blood flow to the scalp, and is particularly beneficial for autoimmune-related hair loss. This combination aims to compound the benefits of both onion juice and rosemary oil, addressing multiple pathways: sulfur/keratin building, quercetin's immune modulation and follicle stimulation, plus rosemary's circulatory and anti-inflammatory effects.

You're going to be adding five drops of rosemary oil. What is so special about rosemary oil? Well, in a randomized trial in 2015, they compared rosemary oil to one of the top medications for alipcia. And they found rosemary by itself was as effective as this medication.

Also said
“Rosemary oil has several phytonutrients that are anti-inflammatory, are antioxidant, that stimulate the scalp in a way that increases blood flow, and it's great for autoimmune issues.”— Explains the biological mechanisms behind rosemary oil's hair growth benefits.

Fermented Onion Juice Supercharge

Fermenting the onion slurry with water, sea salt, and raw honey for 72 hours enhances quercetin bioavailability, produces additional vitamins, and creates an acidic pH of about 5, which the speaker describes as therapeutic for the scalp.

Why this matters: A novel extension of the basic onion juice remedy that leverages microbial fermentation to potentiate active compounds, moving beyond simple extraction.

Background

The speaker frames this as a way to 'supercharge' the recipe, taking the antidote to hair loss and magnifying it. Standard onion juice is effective, but fermentation may unlock even greater nutritional and therapeutic properties.

To prepare the fermented version, you blend one whole onion (peeled, chopped) and strain out the pulp to create a slurry. This slurry goes into a mason jar with 8 oz of water, 1 teaspoon of sea salt, and ½ teaspoon of raw honey. The mixture is covered with a cheesecloth or coffee filter and left on the counter to ferment for 72 hours. Within the second day, you'll see tiny CO2 bubbles, indicating fermentation. The speaker claims this process enhances the quercetin (referred to as 'corsetin') and allows microbes to produce more vitamins. Additionally, the pH drops to around 5, which he says is very therapeutic for the scalp. After 72 hours, the liquid is strained again and applied just like the basic onion juice: massage into wet hair, leave for an hour, rinse and shampoo twice.

What you're doing is you're enhancing the corsetin. The nutrition that's in there is also going to be enhanced because the microbes are going to actually make more vitamins. So basically, we're taking this antidote to hair loss, onion juice, and we're magnifying it. And also, the pH of the onion juice is going to be becoming more acidic to about five, which is going to be very therapeutic to your scalp.

Also said
“you're going to notice within the second day is these little tiny CO2 bubbles, carbon dioxide bubbles popping up.”— Describes a visual cue that fermentation is active.

Recommendations

Products, supplements, and tools mentioned in the episode

1 item

Vitamin D3

Supplement

Recommended at a dose of 10,000–20,000 IU daily to support hair growth, due to its involvement in many hair-related mechanisms.

The speaker mentions vitamin D3 as a critical systemic support, separate from the topical treatments. He doesn't name a specific product, only the compound and dosage. The rationale is briefly stated: 'so many different mechanisms involved with vitamin D in hair growth or loss of hair.' He supplements the mention with the alternative of sun exposure, which aligns with his broader health advice.

you should be taking at least 10,000 or 20,000 IUs of vitamin D3 every day or get a good amount of sun.

Find Vitamin
Disclosed sponsorships1speaker disclosed

Hair Nutrition Video (Self-Reference)

Service Sponsored · disclosed

At the end, the speaker directs viewers to another video he created about eating the right foods for hair support.

DisclosureThe speaker promotes his own video content on the topic of foods that support hair nutrients.

After covering the onion juice protocols, the speaker stresses the importance of diet: 'make sure you're eating the right foods to support the nutrients for your hair.' He then points to an on-screen video link, saying 'if you haven't seen this video on that topic, I'll put it up right here. Check it out.' This is a cross-promotion of his own content, intended to provide comprehensive hair care advice beyond the topical treatment. The viewer is expected to watch that for dietary guidance.

make sure you're eating the right foods to support the nutrients for your hair. And if you haven't seen this video on that topic, I'll put it up right here. Check it out.

Find Hair

Notable quotes

Lines worth pulling out — contrarian, specific, or perfectly phrased

5 items
the group that used the onion juice had an 86.9% result. And when I talk about results, I'm talking about significant hair regrowth. Compared to the other group, which just used water, only had a 13% result.
A striking, concrete statistic that gives unusually strong credibility to a home remedy.
they compared rosemary oil to one of the top medications for alipcia. And they found rosemary by itself was as effective as this medication.
A bold equivalence claim that positions a cheap essential oil alongside a pharmaceutical standard.
What you're doing is you're enhancing the corsetin. The nutrition that's in there is also going to be enhanced because the microbes are going to actually make more vitamins.
Encapsulates the novel fermentation upgrade and the speaker's belief in microbial vitamin production.
the pH of the onion juice is gonna be becoming more acidic to about five, which is gonna be very therapeutic to your scalp.
A specific pH target that suggests a quantifiable, science-backed modification to the remedy.
Onions have the highest amount of corsetin.
A surprising superlative claim that onions are the richest source of quercetin, justifying their selection.

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Topics covered

onion-juicehair-growthquercetinsulfurkeratinalopeciaautoimmune-hair-lossrosemary-oilfermented-onionscalp-healthdandruffantimicrobialvitamin-dhair-loss-remedydiy-hair-treatmentclinical-study
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Educational summary of the cited expert source — not medical advice. Open the source recording linked above and consult a qualified physician before acting on any protocol.