I take no credit for this guide but i hope it helps
Alchemy
A dubious, expensive yet rewarding and interesting skill, alchemy can be a great beneift to your character. This is the fastest way to level your alchemy from 1 to 375. This guide will only use recipes that require herbs and vials.
Getting Started
A lot of herbs are needed to ahcieve this goal. Create an alt storage character (or an alt herb farmer) and have him mail the herbs back to you. Since the last item mailed appears first, have the alt mail the items you need first last.
Gold
If you farm all the herbs yourself, this will cost around 50g (for recipes and vials) but if you buy all the herbs, you will be paying over 300g.
Brief Overview
1 - 60
Minor Healing Potions
(1 x Peacebloom, 1 x Sliverleaf, 1 x Empty Vial) x 60
61 - 110
Lesser Healing Potion
(1 x Minor Healing Potion, 1 x Briarthorn) x 50
111 - 140
Healing Potion
(1 x Bruiseweed, 1 x Briarthorn, 1 x Leaded Vial) x 30
141 - 155
Lesser Mana Potion
(1 x Mageroyal, 1 x Stranglekelp, 1 x Leaded Vial) x 15
156 - 185
Greater Healing Potion
(1 x Liferoot, 1 x Kingsblood, 1 x Leaded Vial) x 30
186 - 210
Elixir of Agility
(1 x Stranglekelp, 1 x Goldthorn, 1 x Leaded Vial) x 25
211 - 215
Elixir of Greater Defence
(1 x Steelbloom, 1 x Goldthorn, 1 x Leaded Vial) x 5
216 - 230
Superior Healing Potion
(1 x Sungrass, 1 x Khadgar's Whisker, 1 x Crystal Vial) x 15
231 - 250
Elixir of Detect Undead
(1 x Arthas' Tears, 1 x Crystal Vial) x 20
251 - 265
Elixir of Greater Agility
(1 x Sungrass, 1 x Goldthorn, 1 x Crystal Vial) x 15
266 - 285
Superior Mana Potion
(2 x Sungrass, 2 x Blindweed, 1 x Crystal Vial) x 20
286 - 300
Major Healing Potion
(2 x Golden Sansam, 1 x Mountain Silversage, 1 x Crystal vial) x 20
301 - 315
Volatile Healing Potion
(1 x Golden Sansam, 1 x Felweed, 1 x Imbued Vial) x 20
316 - 330
Sneaking Potion
(2 x Ragveil, 1 x Felweed, 1 x Imbued Vial) x 20
331 - 350
Super Healing Potion
(2 x Dreaming Glory, 1 x Felweed, 1 x Imbued Vial) x 20
351 - 375
Major Dreamless Sleep Potion
(1 x Dreaming Glory, 1 x Nightmare Vine, 1 x Imbued Vial) x 40
Total Herbs Required
Peacebloom x 60 (3 stacks)
Silverleaf x 60 (3 stacks)
Mageroyal x 15 (1 stacks)
Briarthorn x 80 (4 stacks)
Stranglekelp x 40 (2 stacks)
Bruiseweed x 30 (2 stacks)
Wild Steelbloom x 5 (1 stacks)
Kingsblood x 30 (2 stacks)
Liferoot x 30 (2 stacks)
Goldthorn x 45 (3 stacks)
Khadgar's Whisker x 15 (1 stacks)
Sungrass x 60 (3 stacks)
Blindweed x 30 (2 stacks)
Arthas' Tears x 20 (1 stacks)
Golden Sansam x 60 (3 stacks)
Mountain Silversage x 20 (1 stacks)
Felweed x 60 (3 stacks)
Ragveil x 40 (2 stacks)
Dreaming Glory x 80 (4 stacks)
Nightmare Vine x 40 (2 stacks)