Medicinal herbs and spices - which book?

try Napiers the Herbalist site ,I know they do introduction evenings to herbalism and they might have a book but you can check online and get info or call them.They are based in Glasgow

seasoned pioneers have a lot of information on their site so could be a good resource for you

Grow your own drugs by James Wong. Interesting and practical.

Save your money and find a nutritionist to meet with you. While there are so many herbalist etc around, it has been medically proven that taking some combinations of "natural" healing medicines can actually even be deadly.
Remember that many chemicals are going to remain in your liver. My father, who was very into the vitamins, minerals etc. died of a very rare cancer of the bile duct which very well may have been affected by years of self-medication of natural so called products.
Save your money up, see a licensed specialist first.
And there are many vitamins which are sold that are completely useless.