Long-term use affects digestion and has flow-on effects further down the digestive tract such as increased risk of SIBO
Symptoms can include seizures, agitation, anxiety, increased heart rate and blood pressure, insomnia, nausea and vomiting, and paranoia
The intact garlic mainly contains non-volatile -glutamyl- S -alk(en)yl-L-cysteines, namely, -glutamyl- S -allyl-L-cysteine, -glutamyl- S-trans -1-propenyl-L-cysteine, and S -alk(en)yl-L-cysteine sulfoxides such as S -allyl-L-cysteine sulfoxide (alliin), S -( trans -1-propenyl)- L-cysteine sulfoxide (isoalliin), and S -methyl-L- cysteine sulfoxide (methiin) with a small amount of S -allyl cysteine (SAC) (Figure 1A) (Block, 1992)
For some, the only option has been to resort to compounded drugs for which the Food and Drug Administration has not assured the safety, and for which the main pharmaceutical ingredient is made in Chinese chemical factories without the quality standards of FDA-approved branded drugs
While glutathione is naturally produced and essential for normal cellular function, the effects of supplemental doses during pregnancy require further investigation
Simonian, 2021