Positives

• Women prone to menstrual migraines on 40 mg/day of vitex for 3 consecutive months commonly report meaningful headache reduction in roughly two-thirds of cases for dramatic headache reduction — useful for Long COVID patients with hormonal-headache patterns PMC.
  
  

Negatives

• Patients commonly report it takes about three months to notice effects, and not everyone responds; some report mild gastrointestinal complaints, dizziness, and dry mouth Healthline.
  
  

Hurdles & Side Effects

• Vitex stimulates LH and reduces estrogen while increasing progesterone, so women with hormone-sensitive cancers (breast, ovarian, endometrial), women on hormone therapy/birth control, and those who are pregnant should consult their oncologist or primary provider before use WebMD.