I'd like to clear my inventory a bit, but being a pack rat I'm hesitant to sell some parts. I am on Yorveth's path. Could someone tell me whether the following has any value for anything other than alchemy?

- Endrega hide
- Troll tongue (already completed Troll Trouble and Melitele's Heart)
- Harpy Claws
- Arachas armor
- Arachas eyes
- Kayran eyes
- Kayran skin (already crafted the Kayran armor)
- Kayran tissue
- Queen Endrega pheromones
- Warrior Nekker Blood

Much appreciated. I am sick of being overloaded all the time.

I suggest keeping the 0 weight ingredients that are also marked as quest items.
(queen endrega pheromones and warrior nekker blood in your list)

Some of the other stuff on your list are crafting ingredients, but not for anything impressive.

Personally, I prefer to keep both bits of kayran skin to make the enhancement (rather than making kayran armor which will get replaced) .. but that's probably only best on builds that pimp vigor regeneration %.


Edit:
Actually, I'm getting some niggling memory of troll tongue being useful for making magic wrap, but it may also be sold by a merchant ... not sure on this one.

See below:

1. Endrega hide
- none (supposedly for crafting endrega hide armor enhancement but somehow it uses endrega teeth instead)

2. Troll tongue
- none (since you have done Melitele's)

3. Harpy Claws
- none (supposedly for poisoned harpy claws but never found the crafting diagram)

4. Arachas armor
- Ceremonial sword of Deithwen (I think Mysterious Merchant might have the crafting diagram), Dearg Ruadhri (Chap 3 silver sword but there are better swords)

5. Arachas eyes
- none (since you have done Melitele's)

6. Kayran eyes
- none

7. Kayran skin
- Kayran carapace armor enhancement (I think the crafting diagram is only available in Chapter 1)

8. Kayran tissue
- None.

9. Queen Endrega pheromones
- Caerme (Chapter 3)

10. Warrior Nekker Blood
- Caerme (Chapter 3)

For item stats (and uses of other items), you can search the wiki page
[url=http://witcher.wikia.com/wiki/Portal:The_Witcher_2]http://witcher.wikia.com/wiki/Portal:The_Witcher_2[/url]

By the way, if you don't know this, merchants will restock their goods after you meditate for 24 hours or so. So you don't need to hoard goods like silver/iron ore, (robust) cloth, meteorite ores (they are quite exp though), oil, (hardened) leather, elemental stones.