Blood Aura

Ingredients with blood aura usually came from a location where blood was spilled. Since blood aura wasn't natural, without death or at least heavily injured human or beast, such ingredients were impossible to obtain.

As such, many of the ingredients had mutated to the point that they were carnivorous and would kill any beasts that got close to them to improve themselves.

Blood Ginseng, a common rank ingredient was mostly vines above ground that would grab and kill any beasts that walked close by it.

Similarly, other ingredients also had evolved to kill beasts and humans for themselves.

As Alex recalled all of this, he realized the main problem he hadn't thought out before going out to buy a bunch of such ingredients.

It was the fact that any ingredient that had a blood aura was a byproduct of the death around it.