Garlic, it’s just not to repel vampires anymore!
In ancient Rome, garlic was so prized for it's medicinal properties that the soldiers were required to always carry it as part of their "C-rations"
It was, literally, worth it's weight in gold. Eaten, it would cure intestinal worms, among many other health benefits - and give strength.
In addition, it was used on wounds. It is not applied directly, but crushed and put in a cone, like you would use for cake decorating, and the end was passed just over the wound. The oils in the vapor will kill even gangrene. It was also used in both WW1 and WW11 for that reason - called "Russian Penicillin"
However, in every age, these simple and inexpensive remedies are overshadowed by the drug pushers and doctors. Can't patent a natural plant/herb and don't need office visits if you don't get sick.