In our shop experience, American (Wisconsin) ginseng has a stronger, more bitter taste, so many customers use it for strong ginseng tea. Canadian ginseng tastes lighter and works well in both tea and soup, but it is not as strong as American ginseng. A stronger taste does not mean stronger effects.
How many slices, how long to steep and how often to drink it: a simple Cantonese-style method for American ginseng tea, plus who should skip it, such as people with a cold.