There is no Need to do that... You get cheaper and more than enough from marcus and drug stores lvl 3

Thanks

For all those who have doubts about opium and morphine, here is a guide I made

https://steamproxy.com/sharedfiles/filedetails/?id=3280807567

@Kurczak To get the morphine recipe, you first need to unlock opium, and once you have it, talk to the chemical vendor (one of the first missions involving amphetamine) who is in front of the jungle area's boss.

someone know where is this fucking morphine recept?

@TheNeonBeauty Thank you very much for the information, it can be useful for many people.

@yurik_ in the jungle area there is a hardware store where the card is for sale.

where do i get access card?

@Daiitoku You can get the opium recipe even if you save the guy you just need to deal in La Colina Sangrienta once you've 1 star then she will leave a voice message that gives you a quest to get it from a local vender

I still haven't found recipes in other warehouses, but I do know that to obtain the opium, you have to kill the brother of a person who is stuck in a rock inside a cave. I don't remember the name, but it's part of the main campaign where you are given a choice between two paths, and I know that when you kill him, you get the recipe as a reward. I don't know what happens if you save him, but I do know that at the moment, if you rescue him, you don't get the opium recipe at least.