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Doctrine of signatures= 2 ways of looking at it, #1 walnuts "look" like the brain and studies have found they are beneficial to the brain, #2 Mushrooms are shaped like the ears and again studies have proven they are beneficial. What is also considered in the doctrine of signatures is also you as a human being drawn to a certain tree or plant and later discovering that tree/plant hold medicinal properties that your body needs to heal with.

Wow! Incredible! Thanks @weetreebonsai. I knew about the walnut/brain connection but not much further.

When I first dove head first into herbals for healing my body it was like light bulb moments going off from remembering what the elders all talked about on foods and plants healing everything that ails us.
Finding the science to prove was the challenge.
So much knowledge known thru out the generations have been lost to us all.

Sadly this is true. Much has been lost. Here in South Africa some of the old locals are willing to teach the young ones which wild succulents in our semi desert are medicinal. It's incredible. Have you shared your story on #naturalmedicine?