Will benzoyl peroxide affect the growth of Minoxidil?

This should be fine. In addition to Minoxidil, prp and progesterone can be used to improve beard growth. I recommend getting a formal evaluation with a hair growth expert. Best, Dr. Emer

If you are using both products (benzoyl peroxide and minoxidil), on your face you may want to consider staggering application times.  This will allow the cream to get absorbed before applying the second medication.

These are generally fine provided you are being followed by a physician (ir dermatologist) who can evaluate you periodically and determine if any concerns exist. I often recommend minoxidil first and benzoyl peroxide 4-6 hours later. Sometimes a topical antibiotic is needed with the benzoyl peroxide (like clindamycin or erythromycin).