"Wormwood is useful, however it is poisonous and should not be used long-term on a regular basis."

How long is long term? At what dosage? One study claimed no adverse effects from using 1 ml wormwood tincture 3 times a day for 9 months. I wouldn't advise this. I am now using around 1/3 ml 3 times a day. I guess this is probably safe enough to use for a month and a half.