Soul husks cannot be used as an Alchemy ingredient. However, while at the Boneyard entrance, there are four bottles of soul husk extract. The Dragonborn can also come back after Harkon's defeat and Valerica will trade a soul husk extract for five soul husks.
Since soul husks belong to the category of food items, they also benefit from the Alchemy perk Green Thumb.
- Bring twenty-five samples to Morven Stroud. As a reward, he opens up his merchandise for sale. He exchanges arms, armor and spell tomes, for another twenty-five husks per item.