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Heavy Metal in Most Chocolates May Not Pose Health Risk, Researchers Say

A worker cools chocolate during a manufacturing process in Belgium, May 15, 2024. (Reuters)
A worker cools chocolate during a manufacturing process in Belgium, May 15, 2024. (Reuters)
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Heavy Metal in Most Chocolates May Not Pose Health Risk, Researchers Say

A worker cools chocolate during a manufacturing process in Belgium, May 15, 2024. (Reuters)
A worker cools chocolate during a manufacturing process in Belgium, May 15, 2024. (Reuters)

Concentrations of heavy metals found in single servings of some chocolates and cocoa-based products are too low in most cases to pose a health risk to consumers, research set to be published on Thursday in the journal Frontiers shows.

Some consumer groups and independent test agencies have previously reported heavy metal contamination in cocoa products such as dark chocolate, with possible causes being the type of soil where cocoa is grown and industrial processing.

Yet researchers at the George Washington University School of Medicine and ConsumerLab.com found that 70 of the 72 cocoa-containing products they analyzed fell below limits set by the Food and Drug Administration (FDA) for lead contamination.

They said the findings of their study showed the products may not pose a health risk when consumed as single servings, though larger portions could exceed strict California limits set in a law known as Prop 65.

The recommended single serving for chocolate is about 1 oz to 2 oz (30 gm to 60 gm).

"If contaminated products as a whole are consumed in small amounts and infrequently by most, these contaminants may not be a public health concern," read the paper, which concluded with a call for more testing of consumer products.

"In contrast, if many such products are consumed fairly regularly by the average consumer, the additive exposure may be a public health concern."

US chocolate industry group the National Confectioners Association said the research confirms that "chocolate and cocoa are safe to eat and can be enjoyed as treats as they have been for centuries."

The long-running research analyzed 72 products for potential contamination with heavy metals such as lead, cadmium and arsenic in four different cohorts in 2014, 2016, 2019 and 2022.

"Median concentrations of each metal tested were lower than even the conservative Prop 65," they added, referring to the strict California legislation on food contamination used as a benchmark for the study.

"However, consuming some of the products tested, or more than one serving per day in combination with non-cocoa derived sources ... may add up to exposure that would exceed the Prop 65 (limits)."

The researchers used the California legislation because it sets limits on contamination for the three types of heavy metals tested, while the FDA regulation only sets limits for lead.

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Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
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Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)

A century after the city of Berlin banned swimming in the Spree River because it was so polluted it could make people sick, there's a push by swimmers to get back into the water.

Around 200 people jumped into the slow-moving, greenish water Tuesday to show that it's not only clean enough, but also lots of fun to splash and swim in the Mitte neighborhood along the world-famous Museum Island.

A group calling itself Fluss Bad Berlin, or River Pool Berlin, has been lobbying for years to open the meandering river for swimmers again.

“For 100 years now, people have not been allowed to swim in the inner-city Spree and we no longer think this is justified, because we can show that the water quality is usually good enough to go swimming during the season,” said Jan Edler, who is on the board of Fluss Bad Berlin and helped organize Tuesday's swim-in.

To circumvent the ban, the group registered their collective swim event as an official protest.

Standing on a little staircase that leads down to the Spree canal, which flows around the southern side of the island, Edler stressed that “we want the people to use the Spree for recreation again.”

He pointed to the fact that the river has been cleaned up thoroughly, and that the water quality has improved in the last decade and is constantly being monitored.

Even city officials in the central Mitte district of Berlin say they'd be interested in introducing river swimming again in 2026.

“There are still many things that need to be clarified, but I am optimistic that it can succeed,” district city councilor Ephraim Gothe told German news agency dpa recently.

Supporters of lifting the swimming ban also point at Paris, where the Seine River was opened up for swimmers for the Olympic Games last year and will be opened this summer for Parisians. Swimming there had been banned since 1923.

In Vienna, too, water lovers can splash into the Danube River canal, in the Swiss city of Basel they can bathe in the Rhine, and in Amsterdam there are some designated areas where people can plunge into the canals.

Only in Berlin, swimming has been continuously prohibited in the Spree since May 1925, when the German capital closed all traditional river pools because the water was deemed too toxic. Some of those pools weren't only used for recreational swimming, but were a place for poor people to wash themselves if they didn't have bathrooms at home.

These days, the water is clean on most days, except when there's heavy rain, which leads to some water pollution.

Allowing swimmers to dive into the river would also mean loosening the historical monument protection on some parts of the riverbanks to install easy access ways to the water and places for lifeguards.

Another problem is the busy boat traffic on the Spree that could endanger swimmers. However, for the time being, the Fluss Bad Berlin group only wants to open up nearly 2-kilometer-long (just over a mile-long) canal where there's no boat traffic.

For what it's worth, the German capital, a city of 3.9 million, could definitely need more places where people can cool off in the summer as regular outdoor pools tend to be hopelessly overcrowded on hot summer days.

“The cities are getting hotter,” Edler said. “It's also a question of environmental justice to create offers for people who just can’t make it out of the city when it’s so hot and can enjoy themselves in the countryside.”