there is an awful lot of utter tosh on youtube and similar platforms.

for example - there are plenty of videos on there of people who believe aliens are visiting us on a daily basis and that viruses like covid come from radio waves.

best to listen/watch with a healthy dose of skepticism most of the time

for more fact-based information i find it better to use more authoritative sources - such as the world-renowned herbalists and the fully referenced scientific papers on the topic.

in the case of cordyceps - people have been eating it in the east for around 3-4000 years
if it caused a huge fungus to grow out of your head I think we would have likely heard about it by now.