glutathione for cold The Benefits of Glutathione: The Body's Master Antioxidant 1500mg Liposomal Glutathione Supplement, 12-in-1

The primary cause of deep microbleeds is damage to the deep perforating arteries, resulting from increased blood flow velocity due to hypertension (Jung et al., 2020)

Derdemezis 2014

But off-label scares most doctors

The most well-documented false positive culprits include ibuprofen and certain NSAIDs producing false cannabinoid positives on some older assays, quinolone antibiotics like levofloxacin producing false opioid positives, pseudoephedrine (found in many cold medications) producing false amphetamine positives, ranitidine producing false methamphetamine positives on some immunoassays, sertraline and certain other antidepressants producing false benzodiazepine or amphetamine positives on some platforms, and dextromethorphan producing false PCP positives

Its not FDA-approved, and selling it as a drug or supplement in the US isnt legal (source)