Positives

• A long-COVID patient reported that 500mg pantothenic acid combined with biotin stopped all their LC symptoms Reddit.
  
  
• A patient noticed cognitive improvements—working memory and short-term memory—after adding vitamin B5 to their regimen Reddit.
  
  

Negatives

• Mayo Clinic notes very high doses of pantothenic acid (around 10,000 mg/day, often used for acne or adrenal claims) can cause GI upset and diarrhea, with no robust clinical evidence supporting routine use for fatigue or adrenal insufficiency. Mayo Clinic.
• The NIH Office of Dietary Supplements states that pantothenic acid deficiency in healthy adults is essentially unknown because B5 is widely distributed in food, so supplementation rarely corrects an actual deficit in Long COVID patients. NIH.
• WebMD reports that high-dose B5 can cause stomach upset, nausea, and heartburn especially on an empty stomach, and there are no published trials demonstrating benefit for post-viral fatigue, brain fog, or autonomic dysfunction. WebMD.

Hurdles & Side Effects

• A patient experienced an energy boost but also headache, hot flashes, and chills resembling a COVID relapse after starting B5 Reddit.