Black tea extract

What is black tea extract?

Black tea extract is a concentrated form of the compounds found in black tea, which is made from the Camellia sinensis plant. The extract is commonly used for its potential health benefits and as a supplement in a variety of products.

How does it work?

Black tea extract is believed to work by providing a concentrated source of polyphenols, which are compounds with antioxidant properties. These antioxidants help to protect the body from damage caused by free radicals. Additionally, black tea extract is believed to have anti-inflammatory effects, which may help to reduce the risk of certain diseases.

What are the active ingredients that are important for its medicinal properties?

The active ingredients in black tea extract include polyphenols, catechins, and theaflavins. These compounds are responsible for the antioxidant and anti-inflammatory properties of the extract.

What forms does it come in?

Black tea extract is available in several forms, including capsule, tablet, and liquid form. Some supplements also include black tea extract in combination with other ingredients, such as green tea extract or vitamin C.

When was it first used for medicinal purposes?

Black tea has been used for medicinal purposes for centuries, but the use of black tea extract as a supplement is more recent. The first scientific studies investigating the potential health benefits of black tea extract were conducted in the 1990s.

What does Black tea extract help with?

Black tea extract is a concentrated form of the same leaves used to brew black tea. It is rich in plant compounds called theaflavins and thearubigins. It also carries caffeine and L-theanine, the two found in the cup.

The overall evidence grade on file is B. That means at least one good human trial supports some uses. Others rest on lab work or long use alone, so each use below carries its own grade.

• High cholesterol
  Good evidence — human studies of black tea theaflavins on file; our records name no trial size, dose or journal. In human studies on file, theaflavins lowered LDL, the 'bad' cholesterol. HDL, the 'good' kind, was reported to hold steady. Lab work points to two routes: less cholesterol taken up in the gut, and a boost to the body's own antioxidant enzymes that shield LDL from damage.
  Evidence grade B · Traditional tier T1
• Staying sharp and focused
  Good evidence — repeated human trials of caffeine paired with L-theanine; no sizes or doses recorded on file. Caffeine with L-theanine is one of the best-studied natural pairings for mental performance. In those trials, people felt alert and focused. L-theanine appeared to take the edge off caffeine's jitters, with less of a crash after.
  Evidence grade B · Traditional tier T1
• Heart, blood vessels and blood pressure
  Early evidence — human studies of regular black tea use that measured markers, not heart attacks; no sizes on file. Regular use has been linked to more flexible blood vessels and lower inflammation markers. Some research found small drops in both the top and bottom blood pressure numbers. Researchers credit better vessel relaxation and less oxidative stress on artery walls.
  Evidence grade C · Traditional tier T1
• Blood sugar spikes after meals
  Early evidence — early human work plus lab studies of carb digestion; no trial details on file. Theaflavins and other polyphenols appear to slow how fast carbs are broken down. Studies also suggest cells respond better to insulin. What was reported is a gentler rise in blood sugar after eating.
  Evidence grade C · Traditional tier T1
• Body-wide inflammation
  Early evidence — blood marker studies in people, backed by lab antioxidant tests. In lab tests, theaflavins and thearubigins are strong antioxidants. They soaked up harmful free radicals there. In people, studies recorded lower inflammatory markers in the blood.
  Evidence grade C · Traditional tier T1
• Low energy and tiredness
  Early evidence — caffeine's lift is well established, but no trial of this extract for fatigue is on file. Caffeine is well established to raise alertness for a few hours. That is general science, not a trial of this extract. Paired with L-theanine, many people report steadier energy than from coffee, though that is self-report.
  Evidence grade C · Traditional tier T1
• Losing weight
  Evidence doesn't support this — no human weight trial on file; the idea rests on gut bacteria and fat-absorption theory. The file holds no human weight-loss trial for this extract. Polyphenols are thought to shift the mix of gut bacteria and trim fat uptake a little. Any effect described was small, and tied to diet and activity.
  Evidence grade D · Traditional tier T1
• Gut health and digestion
  Not yet tested in people — lab prebiotic work only; no human gut trial on file. In lab work, black tea polyphenols fed helpful bacteria such as Lactobacillus and Bifidobacterium. They also held back some harmful bacteria. No human trial on file has tested digestion or gut symptoms.
  Evidence grade insufficient · Traditional tier T1
• Cavities, gum trouble and bad breath
  Not yet tested in people — lab studies of mouth bacteria; no human dental trial on file. In lab studies, black tea polyphenols slowed the bacteria most tied to cavities and gum disease. They also cut the compounds that cause bad breath in those tests. Whether that holds in a real mouth over time is not on file.
  Evidence grade insufficient · Traditional tier T1

What Black tea extract has not been shown to do

• No trial on file shows black tea extract causes weight loss on its own.
• Nothing on file shows it can stand in for cholesterol or blood pressure medicine.
• No study on file tracked heart attacks or strokes, only markers such as vessel flexibility.
• No dental trial on file shows fewer cavities or less gum disease in people.
• Nothing on file shows it treats diagnosed diabetes or lowers long-term blood sugar.
• It has not been shown to treat an anxiety disorder; the L-theanine work on file is about caffeine jitters.

How to read this:

Grade A means steady results across randomised human trials. B means at least one good human trial. C means small, early or mixed human studies. D means the human evidence is weak or clashes. 'Insufficient' means no human study at all, just lab, animal or traditional use. These grades describe what studies found, not what will happen to you. This page is not medical advice and does not cover who should avoid it. Talk with your own clinician, especially if you take medicine or limit caffeine.

What can Black tea extract help prevent?

• Cardiovascular disease risk reduction (associated with regular long-term consumption in large population studies)
• Type 2 diabetes risk (modest evidence from prospective cohort data linking habitual tea intake to lower incidence)
• Dental cavities (antibacterial action against Streptococcus mutans is well-documented)

Which foods are rich in it?

1. Black tea
2. Green tea
3. Matcha tea
4. Herbal teas containing black tea extract
5. Supplements and extracts containing black tea extract
6. Energy drinks containing black tea extract
7. Baked goods containing black tea extract
8. Snacks containing black tea extract
9. Beverages containing black tea extract
10. Dark chocolate containing black tea extract

In rare cases, taking high doses of black tea extract may cause liver damage. It is important to speak with a healthcare provider before taking black tea extract as a supplement.

What are possible side effects?

Orally, black tea is well tolerated when consumed as a beverage in moderate amounts

Possible Side Effects:

• Stomach upset
• Nausea
• Headache
• Dizziness
• Insomnia

What's the recommended daily dose?

The recommended daily dose of black tea extract varies depending on the individual and the specific product. A typical daily dose is between 250-500 mg.

How many days does it take to work?

The time it takes for black tea extract to start working varies depending on the individual and the specific product. Some people may start to notice benefits within a few days to weeks.