Mysterious serum

Mysterious Serum is a consumable item in Fallout 4.

Characteristics
A unique consumable only obtainable through the quest lines of Special Delivery and The Secret of Cabot House. Four can be obtained during these quest lines, five if the player can pass a speech check convincing Jack Cabot that no serum was found. Upon one end to The Secret of Cabot House, the player gets access to an infinite supply of this item, with a few caveats: you may only receive one at a time and only when you have none left, you may not sell or store the serum in any way, and you must not attack the source of the serum.

Usage and Effects
It appears in the Aid menu. The item's description lists a Radiation effect of -36000, but this is misleading- it does not act like a RadAway (Fallout 4). Rather, this number comes from removing 10 rads per second for 3600 seconds (60 minutes or one hour). This effect can be best utilized with the Ghoulish perk, as if one stands in irradiated water (which adds 10 rads per second) they will be healed at an incredible rate with no penalty.

Another potential use case is for boosting carrying capacity while scavenging. The boost of +5 STR is significant, as the similar consumable Buffout only gives +2, and any chem mixed with it +3.

Crafting
This item cannot be crafted.

Locations
One at Parsons Creamery. Four on Raider bodies in and around Parsons State Insane Asylum.

Behind the Scenes (QUEST SPOILERS!)
The serum is derived from the blood of Lorenzo Cabot, father of Jack Cabot. It halts aging and gives the user incredible strength. It is through this serum that each family member has lived over 400 years. Though the in-game consumable is not addictive for the player, the Cabot family are psychologically addicted. Jack's sister is the one exception, as she once went a whole month without a dose.