Does wearing a helmet daily cause hair loss?

MX 10 is a high concentration minoxidil (10%) and is considered effective even though it is not FDA approved. With the 10%, however, one also gets more side effects, such as dizziness, lower BP, arrhythmias. 
As for the helmet, it shouldn't be a problem unless it is rubbing your scalp. If you are losing hair where the helmet meets the scalp, then it is a problem. Otherwise, the statistics would suggest you have androgenetic alopecia and the Minoxidil treatment is reasonable.  After 3-4 months, you will know if the MX10 is working or not. Sometimes, stopping the minoxidil can lead to hair shedding.

wearing a helmet daily will not cause hair loss unless it is rubbing on a particular area and pulling out the hairs