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PubMed: (peer-reviewed) Park YM, et al

J., Cameron-Smith, D., Lu, R., Cohen, P., Graham, N

Common Topical Application Patterns Use case Facial anti-aging (community use) Concentration 1-2% Frequency Once or twice daily Cycle length 8-12 weeks Use case Scalp / hair-research interest Concentration 1-3% Frequency Daily Cycle length 12+ weeks ongoing Use case Compounded post-procedure Concentration 1-2% Frequency Per clinician guidance Cycle length Per clinician guidance Topical concentrations are typically expressed as percent weight

6 Limitations and the Honest Bottom Line Pulling the threads together, the limitations bearing on the title question are specific and, importantly, they reinforce one another rather than sitting in isolation