GOF, you posted while I was looking for dosage info. Cool.
I do know one thing: It takes a lot less of an herb to flavor something than it does to get the medicinal benefits. A good example: It only takes about 15µg of Cayenne Pepper to season a single meal (provided all you want is a little spice and mostly flavor, instead of blistering), but to get the medicinal benefits of capsaicin in cayenne pepper, one would need to take about 150mg of cayenne pepper each day. That is 10,000 times the amount to simply season a single meal.
According to the Equipment Lists in Gamemaster Law, pg 106, (verbatim) "The effect is based on a dose weighing approximately half an ounce."
However, doing research on several different medicinal herbal sites, the actual size of the dose can vary greatly. With some herbs, the potency is so great, a single tiny leaf brewed in 8 ounces of water is sufficient. With other herbs, it could take as many as eight large leaves brewed in 8 ounces of water.
The same goes for the other methods such as ingestion, paste, apply, etc. It would all depend on the potency of the herb. However, I would hate to go through each and every herb and have to list the amount also.
I think sticking with the GL amount of half an ounce works. That would mean grocery store spice jars hold 2, 3, or 4 doses. Thus, if you use the idea I posted above, simply adjust the prices as seen fit. Or just use the price for each dose being 7tp to 25tp and adjust for rarity.
Anyway, the initial post was right. The prices listed on the Equipment Lists are atrocious. You'd think they got the price ideas from cocaine, marijuana, et. al. instead of medicinal herbs. I also tend towards low magic campaigns which means normal folk would rely almost solely on herbs more than magic.
rmfr