Well I dont think parietal is a good idea, but alchemy, once it lvled, can be pretty useful.
I suggest Junior Vitamin Pills untill lvl 10 and then HA which can be made with 2 glass until lvl 15 or even more.
Note that if you buy mats you will lose more money than farming it.
Pills and HA are lvl 0 alchemy, they are the only ones Ive actually tried and im still lvl 15 alch. So feel free to tell me Im wrong lol