Green tea is a familiar drink and a well-studied plant. Its leaves are rich in catechins, and the most studied catechin is called EGCG.
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From Anirva, the maker of Hair Radiance. This article is general information, not medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
- Green tea is rich in catechins. The most studied one is EGCG [1][2].
- In the lab, EGCG promoted the growth of human hair follicles. This was reported in a 2007 study [4].
- In mice, green tea polyphenols by mouth led to hair regrowth. One third of the mice that drank them regrew hair, against none of the mice that drank plain water [3].
- In a human trial, a supplement with green tea extract raised growing-hair density. In the trial, 66 women took it for 84 days. It was a blend [6].
- Hair Radiance contains 80 mg of green tea extract. Green tea by itself has not been tested by mouth for hair growth in people [7].
Three kinds of study explain why green tea extract appears in hair formulas. They are a lab study of human hair follicles, a mouse study by mouth, and a 2025 human trial of a blend. This article explains each one and how much is in Hair Radiance.
Facts at a glance
| Fact | Detail |
|---|---|
| Ingredient and form | Green tea (Camellia sinensis) leaf extract, 45% epigallocatechin as printed on the label [7] |
| Amount in Hair Radiance | 80 mg a day, in 3 capsules [7] |
| Percent of Daily Value | No Daily Value has been set [7] |
| Amounts used in studies | One capsule a day of a blend in the human trial. Mouse and lab amounts do not convert [3][4][6] |
| Kinds of evidence | Lab studies; a mouse study by mouth; one human trial of a blend; safety reviews [1][2][3][4][5][6] |
| Human studies cited here | 1 trial of a blend in 66 women. It is a preprint, not yet peer-reviewed [6] |
| Adult upper limit | None has been set. European regulators raised concerns at 800 mg or more of EGCG a day from supplements [2] |
| Last reviewed | [DATE] |
What is green tea extract?
Green tea comes from the leaves of the Camellia sinensis plant. The leaves are steamed and dried without fermenting [1]. Green tea and its extracts contain catechins and caffeine [1].
Hair Radiance contains 80 mg of green tea leaf extract [7].
How might green tea support hair?
EGCG acts on the cells that drive hair growth
At the base of each hair follicle sits a small group of cells called the dermal papilla. In a 2007 study, EGCG made these cells multiply in the lab [4]. The researchers linked this to two effects: more cell growth and less cell death [4].
EGCG and the enzyme that makes DHT
DHT is a hormone closely linked with pattern hair thinning. The body makes it from testosterone with an enzyme called 5-alpha reductase [5]. In lab tests without cells, EGCG was a potent inhibitor of this enzyme. In tests on whole cells, it was not [5].
This is a lab finding. Green tea has not been shown to lower DHT in people.
Does green tea help hair growth? What the research shows
The research on green tea and hair is still growing. It has three levels so far: human hair in the lab, mice, and one human trial of a blend.
In the lab, EGCG promoted the growth of human hair follicles (2007)
Researchers kept human hair follicles growing in the lab and added EGCG. Hair growth increased [4]. They also saw similar effects in the dermal papillae of human scalps [4].
In mice, green tea polyphenols by mouth led to hair regrowth (2005)
Researchers studied 60 female mice that had lost hair on the head, neck and back. Half received green tea polyphenols in their drinking water for six months. Half received plain water [3].
In the green tea group, 33% of the mice had significant hair regrowth. In the water group, none did [3]. Here the green tea was taken by mouth.
In 66 women, a supplement with green tea raised growing-hair density (2025)
This trial enrolled 66 women aged 18 to 52 with recent hair shedding. Half took one capsule a day of a supplement with green tea extract, bamboo extract and selenium. Half took a placebo. The trial ran for 84 days [6].
The density of growing hairs rose by 15.0 hairs per square centimeter in the supplement group, against 6.4 in the placebo group. Hair shedding in a pull test fell by 51%, against 24% with placebo [6]. No adverse events were reported [6].
The supplement was a blend, so the result cannot be credited to green tea alone. Its maker funded the trial, and the report is a preprint that has not yet been peer-reviewed [6].
Study summary
| Study | What was used | Result |
|---|---|---|
| Kwon et al., 2007 [4] | EGCG on human hair follicles and cells in the lab | Hair growth increased; hair cells multiplied |
| Esfandiari and Kelley, 2005 [3] | Green tea polyphenols in drinking water; 60 mice; 6 months | Hair regrowth in 33%, against 0% with water |
| Lacetera et al., 2025 [6] | Green tea, bamboo and selenium capsule by mouth; 66 women; 84 days | Growing-hair density up by 15.0, against 6.4 with placebo |
How much green tea extract is in Hair Radiance compared with the studies?
| Source | Amount a day | Notes |
|---|---|---|
| Hair Radiance (3 capsules) | 80 mg of extract | 45% epigallocatechin, as printed on the label [7] |
| Human trial, 2025 | One capsule, given as 280 mg | Green tea extract with bamboo extract and selenium [6] |
| Green tea as a drink | 90 to 300 mg of EGCG | What tea drinkers get, by a European estimate [2] |
| Level of concern for supplements | 800 mg or more of EGCG | From a 2018 European review [2] |
Hair Radiance provides 80 mg of green tea extract. At 45%, that is about 36 mg of the catechin named on the label, by our calculation. This modest amount is less than tea drinkers get from their cups each day [2].
22 ingredients, including 80 mg of green tea extract
Hair Radiance is a daily three-capsule supplement that pairs green tea leaf extract with vitamins, other plant extracts and probiotic strains. Every ingredient and amount is listed on the label.
See Hair RadianceIs green tea extract safe? Safety and interactions
Green tea as a drink has no reported safety concerns for adults [1]. Green tea extracts in capsules can cause nausea, constipation, stomach discomfort and a rise in blood pressure in some people [1].
Liver problems have been reported with green tea extracts, and they are uncommon [1]. In a 2018 review, European regulators linked 800 mg or more of EGCG a day from supplements with early signs of liver effects [2]. Hair Radiance has 80 mg of extract in total [7].
Green tea contains caffeine. It can also interact with some medicines, including the beta-blocker nadolol, atorvastatin and raloxifene [1].
Green tea is one part of Hair Radiance
Hair Radiance is a daily three-capsule hair growth supplement with 22 ingredients: vitamins, minerals, plant extracts, an amino acid and three probiotic strains. They were chosen to support healthy hair growth, to help promote silky, smooth hair, and to strengthen and maintain healthy hair. Green tea leaf extract is one of them.
Hair Radiance has not been clinically tested as a finished product. For this reason, we cannot say how its ingredients work together.
Every ingredient and amount is listed on the label [7].
If you are deciding
Here is the case in brief. In the lab, EGCG promoted the growth of human hair follicles [4]. In mice with hair loss, green tea polyphenols by mouth led to regrowth in one third of the animals [3]. In a trial of 66 women, a supplement with green tea extract raised growing-hair density more than a placebo did [6]. Green tea by itself has not yet been tested by mouth for hair in people. Hair Radiance supplies 80 mg of extract a day, a small amount with a wide safety margin [2][7]. The directions are three capsules a day with food [7].
The short version
In the lab, EGCG promoted the growth of human hair follicles. In mice, green tea polyphenols by mouth led to hair regrowth. In one human trial, a blend with green tea extract raised growing-hair density. Hair Radiance provides 80 mg of green tea extract a day.
Frequently asked questions
Does green tea help hair growth?
Does green tea block DHT?
In lab tests without cells, EGCG was a potent inhibitor of the enzyme that makes DHT. In tests on whole cells, it was not [5]. Green tea has not been shown to lower DHT in people.
Does drinking green tea help hair?
This has not been tested in people. In the mouse study, the green tea polyphenols were given in drinking water [3].
What is EGCG?
Is green tea extract safe?
Does green tea extract have caffeine?
Yes. Green tea and its extracts contain caffeine [1].
Does green tea interact with medicines?
It can. Examples are the beta-blocker nadolol, atorvastatin and raloxifene [1].
How much green tea extract is in Hair Radiance?
Each serving of three capsules has 80 mg of green tea leaf extract [7].
References
- National Center for Complementary and Integrative Health, National Institutes of Health. Green Tea: Usefulness and Safety. Last updated February 2025. https://www.nccih.nih.gov/health/green-tea (accessed October 7, 2026).
- European Food Safety Authority. EFSA assesses safety of green tea catechins. News item, April 18, 2018. https://www.efsa.europa.eu/en/press/news/180418 (accessed October 4, 2026).
- Esfandiari A, Kelley P. The effects of tea polyphenolic compounds on hair loss among rodents. J Natl Med Assoc. 2005;97:1165-1168. PMID: 16035581.
- Kwon OS, Han JH, Yoo HG, Chung JH, Cho KH, Eun HC, Kim KH. Human hair growth enhancement in vitro by green tea epigallocatechin-3-gallate (EGCG). Phytomedicine. 2007;14(7-8):551-555. doi:10.1016/j.phymed.2006.09.009. PMID: 17092697.
- Hiipakka RA, Zhang HZ, Dai W, Dai Q, Liao S. Structure-activity relationships for inhibition of human 5alpha-reductases by polyphenols. Biochem Pharmacol. 2002;63(6):1165-1176. doi:10.1016/S0006-2952(02)00848-1. PMID: 11931850.
- Lacetera J, Pouchieu C, Pourtau L, Monchaux de Oliveira C, Roveda G, Nobile V. Preclinical and clinical efficacy of a green tea, bamboo, and selenium supplement for the management of acute telogen effluvium in women. Preprints.org. Posted August 7, 2025. doi:10.20944/preprints202508.0556.v1. Preprint, not peer-reviewed. Trial registration: NCT06545552.
- Anirva. Hair Radiance Supplement Facts label and product page. https://anirva.com/pages/hair-growth-supplement-with-probiotics (accessed October 7, 2026).
