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Gallic acid is a potent aldehyde dehydrogenase inhibitor. This supplement is hard to get hold of in pure food grade form though. But there are some food grade supplements that contain it, some as much as 20%.
Gallic acid is present in pomegranate extract, rooibos tea extract, and grape seed extract.
Grape seed extract that's 95% polyphenols contains the following (amounts are approximate):
Catechins, Epicatechins 10%
Gallic Acid 3%
Rooibos tea extract is a better source of food grade gallic acid. You can easily find it standardized for 20% gallic acid.
Pomegranate extracts are mostly ellagic acid, but also contain high amounts of gallic acid. The gallic acid content is about 1/2 the amount of ellagic acid present. This is a better source for gallic acid than grape seed. It's about as good as rooibos tea extract.
I got a free sample of pomegranate extract a while back and posted a report on it's use with elemicin on this forum. The pomegranate extract I got was 40% ellagic acid and 20% gallic acid. Turns out that pomegranate extract inhibits CYP2C9 and so it fucks up elemicin. Don't use it with elemicin.
I haven't used grape seed or rooibos tea extract yet. I think grape seed extract also inhibits CYP2C9 so its not useful for elemicin or other allylbenzenes. Rooibos tea extract might not inhibit CYP2C9. I need to look into this one more.
Beware that there are some places selling gallic acid that's not food grade. Photography stores sell this. DO NOT USE IT! It's not meant for ingestion!