This is really a no man's land .... some creams may promote absorption of the herbal product thru the skin.
So research each herb carefully. Also contact a local compounding pharmacy to see if your cream base will transport things into your body. Not all herbs are safe. Choose only herbs from reputable suppliers who test them first before they sell them. Things that come from China can be adulterated with RX drugs... or other nasty substances.
This is a good resource to know which herbs are for what purpose and which are more problematic or not:
http://cms.herbalgram.org/commissione/
There have been instances of lead found in some herbal products.
Gugglipids from India is one I remember clearly.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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