TLDR  Botulinum toxin was found to be a safe and effective treatment for male pattern baldness in a small test, but more research is needed.   
  In a pilot study conducted in 2017, botulinum toxin was found to be a safe and effective treatment for androgenetic alopecia in males. The study involved 10 male patients with androgenetic alopecia, who were injected with 5 U of botulinum toxin at 30 sites in the scalp. The efficacy of the treatment was assessed through photographic assessment and self-assessment scoring by the patients after 24 weeks. The results showed that 8 out of 10 patients had a good to excellent response based on photographic assessment, while 7 out of 10 patients reported a good to excellent response based on self-assessment. However, the study concluded that further research with a larger sample size and randomized controlled trials are needed to establish the role of botulinum toxin in the management of androgenetic alopecia.
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  December 1980   in “The New England Journal of Medicine”    Minoxidil helped bald patient regrow hair.  
    
  
        
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  January 2020   in “Skin appendage disorders”
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  January 2017   in “Journal of Cutaneous and Aesthetic Surgery”
           24 citations
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  January 2017   in “Journal of Cutaneous and Aesthetic Surgery”    Botulinum toxin was found to be a safe and effective treatment for male pattern baldness in a small test, but more research is needed.  
      20 citations
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  January 2016   in “Intractable & Rare Diseases Research”
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  January 2001   in “Drugs”    Minoxidil and finasteride treat hair loss; more research needed for other options.