Most of the information I have come across online is about preventing further hair loss ('genetic alopecia') in people who are already balding or thinning. But I wondered whether there were any methods or treatments available for people who are at risk of hair loss (e.g., one or both parents show patterned hair-loss) but for which the process has not yet started. So 'prevention' in the true sense of the term in preventative medicine.
For example, the two main pharmacotherapies shown to be effective for slowing hereditary hair loss are minoxidil and finasteride (see this meta-analysis). Is there any evidence that taking one or both of these, perhaps at a lower dose, in people at risk of, but not currently experiencing, hair-loss halts the process? Or perhaps there is evidence demonstrating the effectiveness of products designed to stimulate hair growth (e.g., minerals and oils) compared to some control. Of course, the results may differ between sex.
