Positives

• One patient with Long COVID and dysautonomia attributes their 85% recovery to polyphenols, noting that it helped stabilize their nervous system and reduce POTS symptoms Reddit.
  
  
• A scientist with Long COVID highlights the role of polyphenols in alleviating brain fog and post-exertional fatigue by supporting cellular repair processes Reddit.
  
  
• A patient emphasizes the importance of polyphenols in addressing microbiome disruptions linked to Long COVID, Reddit.
  
  

Negatives

• Patients on apple polyphenol blends commonly describe mild GI upset and diarrhea, with mixed reports of any symptom improvement WebMD.
• Patients on resveratrol (a polyphenol) commonly see no measurable impact on blood lipids in pooled human trials, echoing reports of no benefit on widely-marketed cardiometabolic claims PMC.
• Some patients on high-dose green tea catechin polyphenol supplements developed elevated liver enzymes, which forced them to discontinue with no symptom benefit retained PMC.

Hurdles & Side Effects

• One individual noted the challenge of identifying which specific polyphenols were beneficial, as their symptoms varied with different triggers Reddit.