Skip to main content

Fertility Factors:

Caffeine is a stimulant, found in different amounts, in coffee, black and green tea, energy drinks, some soft drinks, and in chocolate.

There is no clear proof that caffeine affects the ability to become pregnant, but some studies have found that women who drink large amounts of caffeine may take longer to become pregnant and may have a higher risk of miscarriage.

The facts

The average amount of caffeine in a cup of coffee is 85mg but it can range from 40mg to 175mg depending on the type of coffee beans, and how the coffee is prepared.

Research shows that drinking a lot of coffee, tea and caffeinated soft drinks may increase the time it takes to get pregnant.

It may take longer for women who drink large amounts of caffeine to become pregnant.


High doses of caffeine might affect the quality of sperm but it’s unclear if this affects men’s fertility.


Although experts can’t say exactly how caffeine might affect a woman’s fertility they agree that high doses are likely to have some negative effects.

  • What you can do

    To be on the safe side it is recommended that women limit their daily caffeine intake to 200 mg per day (approximately two cups of coffee) if they are pregnant or trying to conceive.

  • References
    • Ricci E, Vigano P, Cipriani S, Somigliana E, Chiaffarino F, Bulfoni A, et al. Coffee and caffeine intake and male infertility: a systematic review. Nutr J. 2017;16(1):37.
    • Lyngso J, Ramlau-Hansen CH, Bay B, Ingerslev HJ, Hulman A, Kesmodel US. Association between coffee or caffeine consumption and fecundity and fertility: a systematic review and dose-response meta-analysis. Clin Epidemiol. 2017;9:699-719.

Page created on: 29/08/2018 | Last updated: 18/09/2018

Looking for more?

Fact sheet: Effects of caffeine, alcohol and smoking on reproductive outcomes

Some lifestyle behaviours are known to affect fertility, pregnancy health and the health of the baby at birth and in adulthood.

Thinking about having a baby?

How men and women can increase their chance of pregnancy and having a healthy baby.