A great option for starting when you've completed the Shades of Mor'ton quest (must go through Herbi Flax's Diary of Herbi Flax) is to OSRS gold prepare Serum.
The Serum is prepared through mixing Tarromin potion with ashes. We've covered Tarromin within Herblore 12-26. Ashes are literally scattered across the entire area.
Herblore Level 36-55
At this stage it is a great idea to try creating...
English
Arabic
French
Spanish
Portuguese
Deutsch
Turkish
Dutch
Italiano
Russian
Romaian
Portuguese (Brazil)