So there are a few different ways of dosing tinctures. I tend to follow the British Phytological School (Hoffman, 1988), where doses usually range from 1ml to 5ml, three times daily. Some herbs, like blue vervain or lobellia, only require very small doses.
Note, if you are combining herbs together it is common to take the same dose combined as you would a single herb.
Also, it is very good to be aware of the Matthew Wood school of dosing, where he recommends small doses, 1-5, quite frequently, e.g. 3 times daily (Wood, 2004). This is more towards homeopathy and it is said to stimulate the vital energy and affect physiology in a poorly understood way. Jim McDonald uses doses a little higher, between 5-15 drops, 3 times daily. They also go up to 5 times daily.
Dried capsule extracts
I tend to follow the directions on the packaging, but also get information from papers, text books, forums, and wherever seems reasonable to me. I have included some guidance regarding dosage from papers and text books in my herbal encyclopedia.
Here are my conversions for tinctures:
I made these myself using an A. Vogel bottle or a dropper and a measuring cylinder. A dropper can be 20 or 25 drops, both end up around 0.70-75ml. Herb Pharm bottles say on the back 0.7ml per dropper.
1 dropper = 20-25 drops = approx 0.75ml
2 droppers = 40 drops = 1.5ml
4 droppers = 80 drops = 3ml
6 droppers = 120 drops = 4.5ml (which is about 1tsp) (generally approx max dose)
A drop and a dropper can be variable, many people are saying online 20 drops is 1ml, I don’t find that to be the case.
Hoffman, David. Holistic herbal. Element Books, 1988.
Wood, Matthew. The Practice of Traditional Western Herbalism: Basic Doctrine, Energetics, and Classification. North Atlantic Books, 2004.