Stronger Minoxidil?

Hi
Is there any evidence that shows that Minoxidil solutions greater than 5% are anymore effective than the 5% solution?

Many doctors think that the higher the percentage, the greater the benefit… but along with a potentially greater benefit comes more and more problems with side effects such as postural hypotension, dizziness, tinnitus, scalp irritation, etc. As well, anything over 5% topical minoxidil (from my understanding) requires a physician’s prescription, probably due to the aforementioned side effects that may require monitoring.

I am not aware of any double blind randomized study / scientific evidence that higher minoxidil concentration works better at growing hair. In my opinion, a higher dose minoxidil for treating hair loss is marketing inspired (“more is better” concept) and anecdotal accounts.