TrinityCore/TrinityCore — comment on commit 9229b878f2705790676806411a18500ab07178cc
File: src/server/game/Spells/SpellEffects.cpp line 2642
By nelegalno:

You need lvl410 ENG to make them and then everyone can use them and if you have the ENG profession you get the bonus. (NO lvl requirement for use). Also this should not stack with the ALCH trinket bonus.

http://old.wowhead.com/item=42545#comments:id=1032962
http://old.wowhead.com/item=41166#comments:id=1080554
http://www.wowwiki.com/Patch_3.2.0
http://www.wowwiki.com/Runic_Healing_Injector