Scientists said those who stick to that limit have no need to worry.
They claim 400mg of caffeine, equivalent to four filter coffees, has no adverse effects but the limit for pregnant women should be three cups.
The US study looked at effects such as damage to the heart, blood vessels and reproductive system.
Dr Eric Hentges, Executive Director, International Life Sciences Institute (ILSI) North America, who carried out the study, said: “This Systematic Review provides evidence that furthers our understanding of caffeine on human health.
“Also, this review provides the research community with data and valuable evidence to support the development and execution of future research on caffeine safety that will impact public health.
“We concluded that the previously-defined levels of caffeine intake in a healthy caffeine consumer (400mg) were not associated with overt, adverse effects.”
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