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H.2 Myth: Minoxidil can make MPB worse
No. Minoxidil doesn't work for everyone. Approximately 17% of patients will continue to see progression of their MPB while using topical minoxidil. But don't mistake the progression of MPB as an adverse reaction to topical minoxidil. In almost all cases, the use of minoxidil is slowing the rate of progression of MPB, even if it is not entirely preventing its progression.
How well minoxidil works to treat MPB is not so much dependent on the patient's age as it is dependent on the genetic propensity of the patient to have MPB. Unfortunately, one's genetic propensity for MPB is not something we can assess. In any case, there is no evidence that minoxidil will force hair in the anagen phase into the telogen phase and cause it to shed or 'not to regrow'. Just the opposite reaction occurs. Minoxidil helps to keep the hair follicles in the anagen phase. It may not have visibly positive results for everyone, but it does not hasten MPB, i.e. it does not cause miniaturization of the hair follicles.