You may believe me or not, but a good product for scalp is Spectral DNC-L.(i inist on the -L, not normal Spectral).
Scalp is very healthy after applying it, contrary to applying normal minoxidil, which usually results in irritation of the scalp.
I also think it is better than normal Spectral at treating hair.
Anyway, this is just from my experience, i see Spectral products are bashed on this forum.
It's true that it's more expensive than normal minoxidil, but it's not liquid, it's a more creamy yellow lotion, and with 2 uses/day, i have one bottle for 3 months, and it will empty after 1+ more month.