Where can I find red mutagens?

I've played for quite some time now, and I've found only two red mutagens so far, both are named ones and not the generic red mutagens. I've at least a dozen of the green and blue mutagens lying around.
Where can I get some more red mutagens from?
Best Answer
According to this wiki, they drop from the following monsters:
Archgriffin, Doppler, Katakan, Greater Foglet, Nekker Warrior, Water Hag, Wyvern, Succubus, and Werewolf
As you can see, they aren't the most common monsters, which is likely why you don't have as many as blue or green. This link has a couple farming locations.
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Where can I find more red mutagens?
Two known farming methods for red mutagens have arisen since Witcher 3 was released, one involving killing a Fiend in Crookback Bog, and the other involving hunting Drowned Dead along the coasts of Skellige.How do I get red mutagens in Witcher 3?
Farming the Alghoul for red mutagensWhere can I farm red mutagens in Blood and Wine?
Kill drowned dead, they drop red mutagen 1/3 times. Run around the Skellige coast looking for them. Another option is the mansion you get in blood and wine, your herb garden here will grow winter cherries. You can use these to make red mutagen, no monsters needed.Where are lesser red mutagens?
Where To Farm Lesser Red Mutagens. Go to the orphanage at Crookback Bog in Velen. From there, go directly south. When you reach the foot of the mountain, climb for a bit.Where can I find red mutagens Witcher 3?
More answers regarding where can I find red mutagens?
Answer 2
I've gotten a Red Mutagen from a Warrior Nekker
But I'm just like you I come across a lot of blue and green ones. But dropped on me a red one from killing a Warrior Nekker in Velen
Answer 3
I found a-lot of them in Skellige fighting different monsters.
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