Yes. During the past decades a tremendous amount of research was undertaken to verify the claims made by herbalists and traditional systems, like Ayurveda and Traditional Chinese Medicine. In general, the outcome was very positve or promising, at least. No wonder - if it wouldn't work at all, people would have stopped using it centuries ago.
There is a special journal dedicated to the mushrooms, e.g.: International Journal for Medicinal Mushrooms.
This link will show you an overview of recent publications dealing with the Agaricus blazei.
This link and also this one gives an overview of recent scientific research about Chaga.
Mumijo / Shilajit is a mythical substance referred to as 'Nectar of the Gods' in the Ayurveda (3000 years old) and Central-Asian folk medicine. Aristoteles mentioned it, 400 years B.C., and even wrote some instructions regarding its use.
This alone already made it worthwhile to investigate: what was true and what was pure myth ? In particular in India and Russia a lot of research was done, with positive and often surprising outcomes.
Herbal medicine is as old as humanity itself. Medicinal-philosophical systems have been developed like the Ayurveda and Traditional Chinese Medicine, both 1000s of years old, each with its own point of view, the core of which is restoring the balance between the body's elements. Then there is pure folk medicine, in general based on simple trial and error, often after observing animals and their behaviour when sick or wounded. Medicinal herbs and mushrooms are the core of all these approaches. Modern western medicine as we know it today started about 150 years ago. The first drugs were herbal-based and the first antibiotics ( like penicilline ) were derived from fungi. Until today science still does not know exactly what makes an aspirine work, but that it works is clear.
Still, despite all the positive results there is a lot of distrust and paranoia, in particular in the West. It is speculative, but in our opinion religion is partly to blame here ( witches use herbal mixes, do they not ? ) and mushrooms do also kill... so beware! Nowadays science is a new form of religion, with the men in white coats as its priests. They have their own motivation when mocking 'alternative' medicine. Financial interests e.g. - after all, you cannot patent a plant or a mushroom, only pharmaceuticals.
Please also have a look at our 'resources' page, where you'll find a large collection of scientific publications about this and related subject matter.
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