Does Green Tea Oil Regrow Hair? We Investigated

And over the past few years, there’s been a new claim doing the rounds: it supposedly regrows hair.

Seriously?

We decided to dig into this properly. Not by trawling through forum testimonials or sponsored posts, but by examining the actual scientific literature. Real studies, with researchers, rigorous protocols, and measurable outcomes.

What we found is genuinely interesting. 33% regrowth in mice, human follicles lengthening by 180% in laboratory conditions, and a molecule that appears to target a baldness mechanism finasteride completely misses.

Intriguing stuff. But hold off on ordering those supplements just yet. As so often happens in medicine, the devil’s in the details. And these details really do matter.

Baldness: a question of enzymes and genetics

Before we talk about green tea, it’s worth understanding what’s actually going on when your hair starts thinning.

Male pattern baldness, in the vast majority of cases, comes down to hormones. Your body produces testosterone, nothing unusual there. The trouble starts when an enzyme called 5α-reductase converts some of that testosterone into DHT.

For your sensitive hair follicles, DHT is a slow-acting poison.

It latches onto receptors in the follicles and gradually causes them to shrink. Hair becomes finer, shorter, and eventually stops appearing altogether. This process is known as follicular miniaturisation.

Here’s where things get interesting: this 5α-reductase enzyme exists in two distinct forms. Type 2 is found mainly in the prostate and deep within hair follicles. Type 1 sits in the skin and scalp.

Finasteride, the go-to medication for hair loss, primarily blocks type 2. It works, certainly, but type 1 carries on doing its thing unchecked.

Green tea, however, appears to target type 1 specifically. That’s a rather significant distinction.

EGCG: not your average molecule

What sets green tea apart from the endless parade of ‘natural remedies’ flooding the market is a molecule with a rather cumbersome name: epigallocatechin-3-gallate. We call it EGCG for obvious reasons, and it’s this compound that’s responsible for most of the interesting properties.

EGCG makes up between 50 and 80% of green tea’s catechins. It’s the most potent, the most researched, and the one showing the most promising effects on hair.

Back in 1995, American researchers made a discovery that caught the scientific community’s attention: EGCG specifically inhibits type 1 5α-reductase. Not type 2. Type 1, the one finasteride doesn’t touch.

Put simply, green tea and finasteride work on different levels. In theory, they could actually complement each other.

But EGCG isn’t just blocking one enzyme. It appears to act on at least seven distinct mechanisms involved in hair growth.

It stimulates proliferation of dermal papilla cells, the tiny factories that produce your hair. It activates the ERK and Akt signalling pathways, which promote growth. It protects follicles from apoptosis, the programmed cell death that speeds up balding. It downregulates androgen receptors. It alters the expression of dozens of microRNAs involved in the hair cycle. It activates something called the Sonic Hedgehog pathway (yes, named after the video game character, that’s genuinely what scientists call it). And it combats oxidative stress, which weakens follicles.

Impressive on paper, certainly. But does any of this actually translate into real hair on real heads?

What the research shows

Laboratory results: rather spectacular

The landmark study here comes from Kwon and his team at Seoul National University, published in 2007. The researchers cultured human hair follicles with EGCG and measured what happened.

The results caught everyone off guard.

Treated follicles grew 180% longer than control follicles. Nearly three times the growth. At the optimal concentration of 5 micromolars, EGCG massively boosted dermal papilla cell proliferation.

Another team in 2016 took things further. They discovered EGCG protected these same cells against DHT damage. How? By modifying the expression of 53 different microRNAs, some of which saw their levels jump 330-fold. Cellular reprogramming, in effect.

Animal studies: 33% regrowth

The most robust animal study comes from Esfandiari and Kelly, published in 2005. Sixty mice with spontaneous hair loss were split into two groups and monitored over six months.

The group given green tea polyphenol extract showed significant regrowth in 33% of cases. The control group? Zero regrowth. A statistically highly significant difference (p=0.014).

Another study by Kim in 2011 tested EGCG applied topically to mice whose hair loss was induced by testosterone. The outcome: noticeably reduced hair loss and decreased follicular apoptosis. Notably, EGCG lowered androgen receptor expression without affecting testosterone or DHT levels. A different mechanism that could potentially complement conventional treatments.

In humans: this is where it gets tricky

Let’s be honest: rigorous clinical trials examining green tea alone for hair loss are thin on the ground. Very thin, actually.

The most robust study comes from Song and colleagues, published in 2023. A randomised, double-blind trial involving 88 participants over 24 weeks.

Results showed a significant increase in hair density (+5.9%, p=0.014) and hair diameter.

The snag? The tested formulation (called BLH308) contained green tea alongside persimmon leaf and sophora extracts. There’s no way to separate out green tea’s individual contribution.

A 2017 pilot study (Nichols et al.) on a supplement containing green tea found 80% of participants reported improvement, with a 5.9% increase in terminal hairs. Same problem though: combined formulation, and just 10 participants.

The honest summary: solid laboratory evidence, encouraging animal results, but no large-scale clinical trials testing EGCG or green tea on its own in humans with typical pattern baldness.

Safety: mostly reassuring, with caveats

Applied topically, EGCG has an excellent tolerability profile. Studies haven’t reported any significant skin irritation. A 10% EGCG lotion applied to the scalp over four days caused no issues whatsoever.

That’s a notable advantage over minoxidil, which triggers contact dermatitis in some users.

Oral use requires more caution. There’s a documented case of acute hepatitis in a patient taking concentrated green tea extracts for hair loss. Histology confirmed drug-induced liver damage.

The patient recovered completely after stopping the treatment, but it’s a useful warning. This is an isolated case, yes, but it underscores an important point: ‘natural’ doesn’t automatically mean ‘safe.’ Concentrated green tea extracts, particularly at high doses over extended periods, can stress the liver.

Some sensible precautions:

• Stick to recommended dosages if taking green tea capsules
• Don’t combine with other supplements that may affect liver function
• See a doctor promptly if you develop unexplained tiredness, nausea, or yellowing of the skin
• Get medical advice if you’re pregnant or breastfeeding
• Avoid altogether if you have existing liver problems

Practical application

You’ve read all this and still fancy giving it a go? Fair enough. Here’s what the research suggests about effective dosages.

Topical application (probably the safest approach): studies used concentrations between 2 and 10% EGCG or green tea extract. In practice, look for hair serums or lotions containing EGCG. Apply daily to the scalp with gentle massage. Give it at least three months before drawing any conclusions.

Oral supplements: The tested formulations typically contained between 200 and 500 mg of EGCG daily. Don’t exceed recommended doses. Concentrated green tea extracts aren’t without risk.

One crucial point: product quality varies enormously. EGCG content can differ threefold between supplements. Choose products that clearly state their catechin or EGCG concentration.

And as with any hair treatment, patience is essential. Hair growth cycles take time. Six months is the minimum to properly assess whether something’s working.

Important limitations

Let’s be clear about what green tea can and can’t realistically achieve.

What it might do:

• Slow the miniaturisation of follicles that are still active
• Create a more favourable environment for growth
• Complement other treatments by targeting type 1 5α-reductase
• Reduce scalp inflammation

What it probably won’t do:

• Wake up follicles that have gone permanently dormant
• Match the proven effectiveness of finasteride or minoxidil
• Restore a full head of hair to a scalp that’s been bald for years

The comparison with established treatments is telling:

Green tea works through a different mechanism. That’s both its potential strength and its limitation. It might play a useful supporting role, but there’s simply not enough evidence yet to consider it a front-line treatment.

When to consider other options

Green tea, like all gentler treatments, has its limits.

If your hair loss is already well established, if you’ve passed Norwood stage III, your temples have receded significantly, and your crown’s been thinning for years, natural remedies alone won’t reverse things.

For areas where hair follicles have permanently shut down, there’s really only one solution: a hair transplant in Turkey.

Dr Emrah Cinik, with over 20 years’ experience in hair restoration, offers treatment plans combining the best of different approaches. Modern techniques like Sapphire FUE and DHI can restore natural density where follicles have given up. PRP, included in all packages, optimises graft survival and stimulates follicles that remain viable.

The smart approach is combining strategies: transplantation to rebuild what’s gone, medical treatment to preserve what’s left. And there’s certainly scope to incorporate treatments like green tea for their complementary effects on type 1 5α-reductase.

A free consultation provides a proper assessment. Where exactly do you stand? Which follicles can still be saved? Is surgery the answer, or will conservative treatment do the job? The answers depend entirely on your individual situation.

One thing’s certain though: acting early is always the wisest move. The follicles we preserve today are the hairs we keep tomorrow.

Key takeaways

Green tea isn’t just another miracle cure being flogged on social media. Behind the marketing, there’s genuine scientific data, identified mechanisms of action, and encouraging laboratory and animal results.

EGCG targets type 1 5α-reductase, the one finasteride misses. It’s a complementary approach rather than a competing one.

In vitro studies demonstrate impressive stimulation of follicular growth. Animal studies confirm a real effect on hair regrowth.

The caveat, and it’s a big one, is the absence of high-quality human clinical trials. We can’t say with any certainty today that drinking green tea or applying EGCG to your scalp will regrow hair the way we can say it about minoxidil or finasteride.

It’s a promising avenue, not a proven solution. A potential complement, not a first-choice treatment.

If you want to try it, the risks are low with topical application. If taking it orally, be sensible about dosage. Either way, don’t expect miracles if your hair loss is already advanced.

Research continues. Perhaps in a few years we’ll have the evidence that’s currently lacking. For now, green tea deserves its place in the hair care toolkit, but in its proper position: as a potential ally, not a miracle cure.

Scientific references

Kwon, O. S., Han, J. H., Yoo, H. G., Chung, J. H., Cho, K. H., Eun, H. C., & Kim, K. H. (2007). Human hair growth enhancement in vitro by green tea epigallocatechin-3-gallate (EGCG). Phytomedicine, 14(7–8), 551–555. https://doi.org/10.1016/j.phymed.2006.09.009

Liao, S., & Hiipakka, R. A. (1995). Selective inhibition of steroid 5 alpha-reductase isozymes by tea epicatechin-3-gallate and epigallocatechin-3-gallate. Biochemical Pharmacology, 50(11), 1893–1896. https://pubmed.ncbi.nlm.nih.gov/7575552/

Esfandiari, A., & Kelly, A. P. (2005). The effects of tea polyphenolic compounds on hair loss among rodents. Journal of the National Medical Association, 97(8), 1165–1169. https://pmc.ncbi.nlm.nih.gov/articles/PMC2576011/

Shin, S., Kim, K., Lee, M. J., et al. (2016). Epigallocatechin gallate-mediated alteration of the microRNA expression profile in 5α-dihydrotestosterone-treated human dermal papilla cells. Annals of Dermatology, 28(3), 327–334. https://doi.org/10.5021/ad.2016.28.3.327

Kim, Y. Y., No, S. U., Kim, M. H., et al. (2011). Effects of topical application of EGCG on testosterone-induced hair loss in a mouse model. Experimental Dermatology, 20(12), 1015–1017. https://doi.org/10.1111/j.1600-0625.2011.01353.x

Song, J. Y., Kim, M. J., & Kim, H. J. (2023). Efficacy and safety of persimmon leaf formulated with green tea and sophora fruit extracts (BLH308) on hair growth: A randomized, double-blind, placebo-controlled clinical trial. Journal of Cosmetic Dermatology, 22(12), 3383–3390. https://doi.org/10.1111/jocd.16024

Nichols, A. J., Hughes, O. B., Canazza, A., & Zaiac, M. N. (2017). An open-label evaluator blinded study of the efficacy and safety of a new nutritional supplement in androgenetic alopecia: A pilot study. Journal of Clinical and Aesthetic Dermatology, 10(2), 52–56. https://pmc.ncbi.nlm.nih.gov/articles/PMC5367873/

Hiipakka, R. A., Zhang, H. Z., Dai, W., Dai, Q., & Liao, S. (2002). Structure-activity relationships for inhibition of human 5alpha-reductases by polyphenols. Biochemical Pharmacology, 63(6), 1165–1176. https://doi.org/10.1016/s0006-2952(02)00848-1

Van der Weide, J. (2009). Acute hepatitis after treatment for hair loss with oral green tea extracts (Camellia sinensis). Acta Clinica Belgica, 64(4), 368–369. https://pubmed.ncbi.nlm.nih.gov/19637786

Dhariwala, M. Y., & Ravikumar, P. (2019). An overview of herbal alternatives in androgenetic alopecia. Journal of Cosmetic Dermatology, 18(4), 966–975. https://doi.org/10.1111/jocd.12930