Me and Janet we purchased osha root tincture 8oz. for $38.00 from Crescent Moon. They are located in Maine. The ratio is 80% alcohol, 20% water and 1 part osha root to 2 parts menstruum. So there is 4oz osha root in an 8oz. bottle
The following is a similar warning, with additional advice about how long to take it, from doctorshealthpress.com:
"A Hint of Caution
If taking Osha root for extended periods of time, it's a good idea to take a break every couple
of months or so. Even though it's not a prescription medicine, you don't want your body to
become immune to its medical benefits. Women who are pregnant or nursing should avoid the
herb, as it can cause uterine contractions."
Where I live this plant is over prescribed and horribly over harvested. The plant is endangered as a result of the above. Useful for lung/respiratory conditions especially colds but in terms of other potential uses there are better analogs out there. I'm not as hip to using it or recommending it because of how badly harvesting is managed. Good medicine but it's kind of like goldenseal: over harvested and over used even though other potential alternatives exist. Just my 10 cents.