Lifegiver

Livegiver or Life Giver is a Fallout, Fallout 2, Fallout 3, Fallout: New Vegas, Fallout Tactics, J.E. Sawyer's Fallout Role-Playing Game, and Lionheart perk.

Fallout, Fallout 2, Fallout Tactics, and J.E. Sawyer's Fallout Role-Playing Game
Every time your character gains a level, you gain an additional four Hit Points for each rank of this perk. With two ranks of Lifegiver, that's +8 HP each level, which is more than 10 points in Endurance would give you.

Although it's not clear from the description, Lifegiver grants +4 HP for every level gained, including the level when the perk was taken.

Fallout 3, Fallout: New Vegas
You gain an additional 30 Hit Points.

This perk also gives you unique dialogue choices when talking with some specific characters, like Tree Father Birch in Oasis.

Bugs

 * In Fallout: New Vegas, the health that Lifegiver grants is excluded from the 50% calculation for Ferocious Loyalty.

Lionheart
With each rank of this perk, you gain an additional 6 hit points.

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