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Description
Some still do

In general, risks are very low but do occur occasionally

Chemical modification of a specific inhibitor of nicotinamide N-methyltransferase to generate a membrane-permeable prodrug. Journal of Medicinal Chemistry , 61(3), 1366-1371

Standard oral glutathione has very low bioavailability

Effect of green tea supplementation on inflammatory markers among patients with metabolic syndrome and related disorders: a systematic review and meta-analysis

Elevated cerebrospinal fluid ratios of cysteinyl-dopamine/3,4-dihydroxyphenylacetic acid in parkinsonian synucleinopathies
