strengths of herbs vary considerably so the dosage of each plant type is extremely important in herbalism and something you must to be aware of. People tend to automatically think of herbs as foods and therefore assume that they're completely safe no matter how much you consume. But that's absolutely not true, and you can do yourself some serious damage if you overdose on certain herbs. ere's an example... You can safely drink 5 or 6 cups a day of a chamomile infusion with no problems, but something like Yarrow is considerably more potent, so your consumption must be in much smaller doses. And then you have things like feverfew which is so strong it should never be used as an infusion or a decoction. The adult dosage for feverfew is just 5 drops of tincture in a cup of water no more than 3 times a day. Take the dosage higher than 15 drops in a day and it could become potentially toxic. The same goes for Comfrey, Ephedra and others. So its really, really important that you never make a preperation from a herb that you don't have sufficient background information on, or understand its potential strength! Also, just as people can have reactions to certain types of medicines, some people can have reactions to certain herb plant groups, so when you are trying a particular herb for the very first time, it's always a good idea to try just a small amount and then give it some