If you manage to get your Alchemy skill to level ten, you will be able to create every powerful potions that will increase various statistics, such as in Vitality, Strength, or Dexterity. Brew one of these potions, and then to increase its statistical boosts, simply brew it again. With the exception of potions involving damage boosters, you can do this to any potion over and over again to increase its potency. (unverified)