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Using up some Calendula flower I had purchased last year. I said I would try to include some instructional herb videos on my channel so here is the first.
Basic rule of thumb is 1 oz dry herb to 10 oz oil - if herbs is very fluffy more oil may be needed.
A google search will reveal many ways to make hot oil infusions, from a double boiler for a few hours to using the sun for several weeks. Your herb infused oils can be used for many herbal products including salves, ointments, soaps, and straight use (depending on the herb's properties). There are many great books on the market to get started making your own medicinal herbals, but PLEASE use caution to avoid interactions and allergies. Consult an expert if you are new to herbal medicines.
Some herbs are toxic to everyone, some may be toxic to a few. Always seek professional medical help in an emergency!