Can fish oil supplements and vitamin D supplements cause liver damage?

Everyday I take one 1,000mg fish oil gel tab and one 4,000 IU vitamin D gel tab. My dad came up to me and told me to stop taking them because they will damage my liver. He said anything that s concentrated is hard for the liver to digest (he does not have a medical background at all). I ve never heard anyone say that. All I ve heard are recommendations for those two supplements. I did research online and I ve only found information about weight loss supplements causing liver damage. Can anyone help?