Note that MRI with contrast has very low risk and I am not aware of any evidence that Gadolinium retention even has adverse health effects. It is a concern though and this is why it is being studied. But I do not think the use of MRI contrast agents is something anybody without kidney disease should be concerned about. In general, risks and benefits must be balanced for any medical procedure. Such risks are continuously monitored and studied and guidelines are formulated based on this. Also consider that there is very clear harm from people being scared away by misinformation from medical procedures they would benefit from.
I am working in this field, so I am aware of nephrogenic systemic fibrosis as rare condition caused by Gadolinium contrast agents in people with kidney disease. As far as I know, there was no new case in the last 10-15 years after the took certain less-stable contrast agents from the market and assessing kidney function is also standard now. In the aftermath of this, scientists discovered that Gadolinium is retained in the body after MRI scans to a small amount. As far as I know there is no evidence that this causes any harm, but as I said, this is a concern and this is why it studied.
