Link. One of 96 human/neand mutations. 150K y ago something big happened to humans. TKTL1 may play role in glioma. Expect studies of TKTL1 in cognitive disability.
Link. Paywalled, but one review claims a dose-response curve with cortical thickness. MRI and cognitive testing. Correlation, not causation (non-random use). Mechanism unclear. Dosages much higher than androgen replacement of course.
Link. Now trailing Gov Waltz by 20 points. GOP likely to abandon him.
Link. Mostly GOP.