Alchemy 300 - 375

300 - 315
Volatile Healing Potion (1 x Golden Sansam, 1 x Felweed, 1 x Imbued Vial) x 20
N.B. You can make Major Mana Potions up to this point if you prefer. You'll need to make about 25 though.

315 - 330
Sneaking Potion (2 x Ragveil, 1 x Felweed, 1 x Imbued Vial) x 20

330 - 350
Super Healing Potion (2 x Netherbloom, 1 x Felweed, 1 x Imbued Vial) x 20

350 - 375
Major Dreamless Sleep Potion (1 x Dreaming Glory, 1 x Nightmare Vine, 1 x Imbued Vial) x 40
Goes green at 370, but it's easier to skill up on this, now that it's in the game, than use low drop rate recipes or faction rewards.
Can be bought from Leeli Longhaggle in Allerian Stronghold (Terokkar Forest) for Alliance and from Daga Ramba in Thunderlord Stronghold (Blade's Edge Mountains) for Horde players.

Approximate Materials Required

20 x Golden Sansam
60 x Felweed
100 x Imbued Vial
40 x Ragveil
40 x Dreaming Glory
40 x Nightmare Vine
40 x Netherbloom