Friend of the Followers

Friend of the Followers is an unmarked quest in Fallout: New Vegas.

Detailed walkthrough
When talking for the first time with Julie Farkas about Freeside, she will tell the Courier that the Followers of the Apocalypse need a constant supplier for some ingredients used to manufacture medicine items.

For a constant supply, talk to James Garret at the Atomic Wrangler and convince him to strike a deal with the Followers. Then report back to Julie, convincing her that the Garrets want to help Freeside in exchange of the Followers' technical skills. After talking to her, report again to James Garret and he will inform the player character that some of the supplies will be sent immediately. Return again to Julie and gain a huge boost of reputation with the Followers.

The player character will also have to spare some of their own Med-X, RadAway or Fixer, 10-15 packs of any should do the trick. Note that 10-15 donations of each are not required, but a total of any of them. (One can donate only Med-X for example, which is far more common than Fixer and RadAway.)

One can know the quest is completed when the next time they want to donate some supplies, Julie tells them that the item in question is already being mass-produced, but she will accept it anyway. After the donation, she will offer a discount in medical services and some magazines for sale (several Programmer's Digest and Today's Physician, some Lad's Life, Salesman Weekly and one Meeting People). The Courier will gain more reputation with the Followers as well.