to (the best of|) my knowledge

used when one is about to say something that is only based on information they have

The idiom "to my knowledge" is believed to have originated in the 16th century and is used to indicate that the speaker is stating something based on their knowledge or understanding. This expression is used to suggest that the speaker is being honest and upfront about their level of certainty regarding the information they are providing.

To my knowledge, there have been no reported cases of food poisoning from this restaurant.
To the best of my knowledge, the company has not yet implemented any new policies regarding employee conduct.
To my knowledge, the historical records do not mention any significant battles fought in this region.
To the best of my knowledge, the scientific consensus supports the theory of evolution.
To my knowledge, there are no known side effects associated with this medication.