Ingestible sensors offer a simple way to monitor health from inside the body. But safely powering them is a challenge. Traditional batteries contain harmful chemicals. They can damage stomach tissue if they leak. To solve this, MIT researchers have developed a battery that is safe for human consumption. It even breaks down naturally in the body.
The battery makes electricity using magnesium and a form of molybdenum. The human body can safely handle small amounts of both materials. It is wrapped in edible rice paper and coated with beeswax. This covering protects the battery, allowing it to work for a few days before stomach acid starts to break it down.
The researchers tested the battery in pigs whose digestive systems are similar to humans. In one experiment, it powered a small wireless tag that sent signals from the stomach. In another, it was used in a capsule that released a hormone to help control hunger. In both cases, the battery lasted for about three days. It then gradually broke down in the stomach.
The team published its findings in the journal Nature Chemical Engineering on September 21, 2026. They hope to start human trials within two years. If the batteries are safe, they could help doctors use tiny cameras and sensors to check a patient's stomach and gut health. This would reduce the need for uncomfortable procedures or surgery.
Resources: Smithsonianmag.com, news.MIT.edu
