I don't manage more than 2 a day cos it's a bit of a laxative for me! However, one is certainly effective in relieving my morning nausea, taking it on waking. I haven't needed it since I started acupuncture, which relieved the nausea more effectively.
New stuff: GERD, Recurrent cystitis/Overactive bladder
Lifelong stuff: Food allergies/intolerance, eczema, asthma