When you read about a medical study, you trust that the information is accurate. But sometimes, errors are discovered after publication. That's what an erratum is—an official correction issued by a journal to fix a mistake in a previously published paper.
This notice tells us that a specific study contained an error, though the details of what was studied, who was involved, or what the mistake was are not provided in this alert. The researchers or journal have formally acknowledged the problem. No information is available about whether this error involved safety, the main results, or something else.
For anyone who might have read the original study, this is a heads-up. The corrected version is now the one to reference. It doesn't necessarily mean the original conclusions were wrong, but it does mean they should be viewed with the correction in mind. Always look for the most current version of any research.