The restoration potion loop glitch can let you make insanely powerful potions - and the Fortify Restoration effect (note only applies to the Potion effect version. Armor enchants by the same name only reduce mana cost of restoration school spells) will affect the strength of equipment enchantments (abused in the loop to strengthen Fortify Alchemy effects to cause the loop's effects to increase exponentially) when equipped, so you only need to reach an strength of about 2000% or more on Fortify restoration and equip a Amulet of Talos to reach 100%+ cooldown reduction on shouts, eliminating the cooldown entirely (amplified enchantment effects buffed by Restoration Potions will keep their increased effects active even if the option wears off and only remove the effect when unequipped - so just never unequip the amulet of talos and the effect will stay active).
