What Tea Is Good for Male Fertility and Sperm Health?

No tea has been shown to get a couple pregnant faster, but several everyday teas show real promise for sperm health in early research. Tea is rich in antioxidants, and damage from unstable oxygen molecules is one of the main known contributors to male infertility.¹ Tea is not automatically harmless, though, because a couple of popular herbal teas have the opposite effect in animal studies.² The strongest human evidence for better semen comes from two root remedies, usually taken as supplements rather than brewed as tea.³

Why Antioxidants in Tea Matter for Sperm

Your body makes reactive oxygen molecules all the time, and sperm need small amounts of them to work normally, including to get ready to fertilize an egg.⁴ When these molecules outrun the body’s antioxidant defenses, the result is an imbalance, called oxidative stress, that damages cells.⁵ In sperm, that can mean harm to DNA, fats and proteins, dead sperm cells, and weaker semen test results such as count and motility, meaning how well sperm swim.⁶ Smoking, alcohol, toxins, radiation, infection and a varicocele (an enlarged vein in the scrotum) all raise oxidative stress around sperm.⁷

Sperm are especially exposed. They have very little of the internal fluid that holds a cell’s own antioxidant enzymes, so they carry limited built-in protection and lean heavily on antioxidants in the surrounding semen. Their outer membranes are also rich in fats that reactive oxygen attacks easily. Tea contains plant compounds such as catechins that can neutralize reactive oxygen molecules, which is the proposed way a cup of tea could lend sperm a little extra protection.

More antioxidants is not always better, since wiping out reactive oxygen is not the goal; balance is. That likely explains why some teas help at normal amounts but harm at very high doses.

Men with lifestyle sources of oxidative stress, such as smoking or heavy drinking, likely have more damage to offset, and cutting back on those habits matters more than adding tea. A varicocele is a common, treatable cause worth checking with a doctor. Tea cannot fix a blocked tube, a hormone disorder or a genetic cause, and a semen analysis shows which numbers, count or swimming, are actually low.

Green Tea

Rats drinking green tea in place of water had higher sperm counts and up to about 40 to 55% more living sperm, though swimming speed did not change.⁸ In rats exposed to the toxic metal cadmium, green tea reduced sperm damage and abnormal sperm shapes.⁹ Green tea’s main antioxidants, the catechins, appear to blunt the oxidative damage cadmium causes.¹⁰

Lab tests on human sperm point the same way. Sperm treated with EGCG, green tea’s main catechin, swam better and survived longer.¹¹ Green tea extract also reduced broken DNA in human sperm when the sperm were stressed by freeze-drying.¹²

Concentrated extract is a different story. In rats given green tea leaf extract, testis weight, sperm count, motility and testosterone all fell, with worse effects at higher doses.¹³ The rats that benefited drank tea brewed at a normal strength, while the harm came with concentrated extract at rising doses. Extract pills can pack the catechins of many cups into one capsule, so brewed green tea and high-dose extract should not be treated as interchangeable. Sticking to brewed tea is the cautious choice while trying to conceive. These studies show a plausible benefit, not a proven one, and no study yet shows green tea drinkers conceive sooner.

White and Black Tea

White tea is the least processed tea from the same leaf as green and black tea. In prediabetic rats, it restored sperm count, swimming, survival and normal shape while reducing oxidative damage in the testes.¹⁴ White tea extract also protected human sperm in the lab from deliberate oxidative attack, cutting broken DNA and improving survival and swimming.¹⁵ And it kept stored animal sperm alive better than green tea did.¹⁶

That can make white tea look strongest, but much of its evidence comes from lab dishes and stored sperm. Green and black tea were studied in different experiments with different designs, so the teas cannot be fairly compared head to head.

Rats given black tea had about 44 to 49% more living sperm and about 10 to 12% better swimming, with no change in testosterone or count.¹⁷ The same study noted subtle changes in some reproductive organs and kidney function.¹⁸ Theaflavins, the antioxidants formed when black tea leaves are processed, protected rat testes and sperm DNA from cadmium damage.¹⁹

Black tea has more caffeine, and white usually the least. The evidence is too early to rank one clearly above the others, so pick the one you will drink steadily, without sugar.

Rooibos, a Caffeine-Free Option

Rooibos is a red herbal tea from South Africa that contains no caffeine. Being caffeine-free makes rooibos good for evening drinking without hurting sleep. Rats given unfermented, or green, rooibos for about 52 days had higher sperm counts, survival and swimming.²⁰ Under oxidative stress, rats on rooibos had higher sperm counts and motility and stronger natural antioxidant defenses in their sperm than rats on green tea.²¹

The red, fermented kind, however, caused some sperm to release their egg-penetrating enzymes too early, which can impair fertility.²² Green rooibos may therefore be the better pick if you choose rooibos. Most rooibos sold is the red, fermented type; green rooibos is labeled unfermented and tastes grassier.

Ashwagandha, Maca and Ginseng

In men with low sperm counts, ashwagandha root extract for 90 days raised sperm count by about 167% and swimming by about 57%.²³ Testosterone rose about 17% in the same men.²⁴ This was a small early trial using a measured root extract, not brewed tea.

The big percentages came from men starting with low counts, and a low starting point leaves more room for a large percentage change than a normal count would. The trial justifies larger studies rather than a recommendation for every man with a poor semen analysis.

Maca, a Peruvian root, increased semen volume, sperm count and swimming in adult men.²⁵ It did not change testosterone or other reproductive hormones.²⁶ Taking more maca did not raise sperm count further.²⁷

A compound in ginseng made human sperm swim better in the lab, including sperm from infertile men.²⁸ No evidence here shows that ginseng tea improves semen in men who drink it.

The trials used fixed doses of powdered root or extract, while a tea bag gives an unknown, usually smaller amount. Supplement labels also vary widely in quality. Ask a doctor before starting, especially if you take other medicines or have thyroid problems.

Teas That May Harm Sperm

In rats, spearmint lowered the signals that tell the testes to make testosterone, reducing testosterone and sperm density.²⁹ Another rat study found only small, non-significant drops in testosterone and sperm count, meaning they could have been chance, and no tissue damage.³⁰ The studies disagree and none exists in men, so the risk is uncertain. Limiting daily spearmint tea while trying to conceive is reasonable, a cautious limit rather than a ban.

Hibiscus extract, cold or boiled, altered sperm shape and testis structure in mice.³¹ In rats, hibiscus damaged testis tissue and at high doses lowered sperm counts.³²

Both can hide in blends. Hibiscus colors many red “berry” and fruit teas, and spearmint turns up in many mint and digestive blends. Peppermint was not the one studied here. Check ingredient lists, not just the name on the box.

These effects came from animal studies, often at large doses. An occasional cup is unlikely to matter; daily heavy use during the months of trying is what to avoid.

Caffeine and Tea Bags

In most studies, caffeine from coffee, tea and cocoa did not appear to affect semen quality.³³ Colas and caffeinated soft drinks, though, were linked to lower semen volume, count and concentration in some studies.³⁴ Cola’s effect may come from something other than caffeine, such as sugar or other ingredients, since it was not seen with coffee or tea. These are observational links, which show an association and cannot prove the drink caused the lower numbers. Swapping soda for unsweetened tea is a sensible change.

Tiny plastic particles have been found in tea bags as well as in human blood.³⁵ In animals, microplastics damaged sperm DNA and lowered testosterone.³⁶ Loose-leaf tea in a metal strainer avoids plastic bags as one source.

Silky “pyramid” bags are often nylon or plastic mesh, and some paper bags are sealed with plastic. Human harm from tea bag plastics is not yet shown.

How to Brew and How Much to Drink

Green tea released the most antioxidants after about 10 minutes in boiling water.³⁷ White tea brewed at about 98 °C for 7 minutes gave high antioxidants and a pleasant taste.³⁸ The best method varies by tea, though: black tea did best with a short hot brew, and green tea with a long cold steep.³⁹ Long hot brews can taste bitter, so cold-brewing green tea overnight is an option.

Two to three cups of brewed tea a day fits normal diets. Skip sugar and sweet syrups, and keep it up for about three months before judging.