Are there any specific source book I can buy for chemical idea lethal and non lethal as my character while not a pacifist (He like to shoot people in the kneecaps and throws them a med kit after) don't wont to be a people to suffer he will kill if he has to.
Arsenal has a whole chapter on the subject, and there's some basic stuff in the core book. Arsenal also includes the "chemistry set" rules, which are a godsend for anyone that actually wants to use chemicals as a part of their setup, since the retail prices per "dose" in the books are just
ridiculous.
Arsenic, for example, is 120¥ a dose and, IRL, it costs under $4 a gram at a chemical supply retailer. That means a "dose" would be 30 grams... which is problematic, given that it states that Arsenic has 1 power per total number of ingested doses. Toxin charts tell me that 2mg/day is fatal in a matter of weeks, while an acutely lethal dose is in the range of 100-200mg. That means a "dose" is pretty much 2mg, working out to 60,000¥ a gram, or a 15,000x increase from 2011 retail.
This is pretty typical of a lot of compounds and chemicals in the game. However, if you brew your own you bypass all that nonsense although, ironically, non-lethal compounds would actually be more involved and complex than extracting simple toxins from common plants... Ricin from Castor Beans, Abrin from Rosary Peas, Atropine from Nightshade, etc).