Okie heres my shot at an alchemy guide to help people enjoy crafting ^^
Tsurara ×10 (1-6)
Super fast synth and you can make all your money back here.
Poison Dust (6-12)
This one can get expensive if you buy Cobalt Jellyfish from Auction House. Camp the Fishing Guild at 0300 in Windurst or Alchemist Guild at 0800 to get these. Also theres a Vendor in Bibiki Bay.
Poison Potion (16-18)
This one is much less expensive for when you cant find Cobalt Jellyfish for cheap, but you will need Guild Support until you are 15. Make sure you get sage from vendors in main cities, or white gate if possible. Also go to selbina for cheap distilled water and stock up on a bunch of them before tackling this while camping the vendor for the sage.
Silent Oils (20-24)
This one sucks. Its really slow to get items needed. But if you farm Slime Oil and have a 60+ Alchemy make you Beeswax you will make good money =). If you still are having trouble with this, you can farm tonberry lanterns in the jungle and de-synth them (skill cap : 24 unfortunately) for slime oils.
Blinding Potion (24-27)
Kinda cheap synth you will break even or lose a little but you'll make it back later fast.
Artificial Lenses (27-34)
This synth rules. It's so cheap. Just sell vitriol when done for 3k a stack.
Holy Water (43-51)
This one is my favorite because I couldn't believe they were 16k a stack and so cheap to make. Lower Jeuno Gobbie shop is your friend.
Cermet Chunk (51-56)
OMG this is expensive only do this if you farm them.
Cermet Chunk (51-58)
Again OMG expensive >.> same as above.
Cermet Chunk (51-60)
Again expensive make sure to have support till at least 5 levels from cap.
With this synth you will make money but they don't stack. I did these and some Cermet Chunks to break it up a little all the way to 60 but I never bought Malboro Vine - I went to Ordelle's Caves and farmed the relevant monster, which drop 1-3 at a time.
Well Good Luck to anyone interested hope this guide helps.