Hi there doctor rassman
here is a study on minoxidil injected to the scalp vs topical treatment – Egyptian Dermatology Online Journal
The injected minoxidil was done 2 times and then one time a week and yielded greater results than topical treatment.
This is clearly not an approved study; however, I would not doubt the results reported by the Egyptian doctor. Minoxidil was originally an oral medication for the treatment of high blood pressure, and it worked, though not well.
At an ISHRS meeting a couple of years ago, it was reported that minoxidil by mouth or intramuscularly could reverse hair loss and was a common practice in India. We know from the old studies on the oral minoxidl that systemic administration produced excess hair production in different parts of the body.
I will not be offering it in my practice until the FDA comes out in favor of it, but it is interesting research.