is it possible to get additional protein in my diet (without adding calories) in the form of a pill?

I would imagine not. Even if there was a pill, each gram of protein has 4 calories.

so how are amino acid supplements without calories then i wonder?

amino acids are the building blocks of proteins.

The completed protein structure has the energy (calories) in the chemical bonds between the amino acids. The acids themselves have very little energy stored in their internal bonds.

duh. i have total brain farts sometimes.
ty mand.

So if a person loaded up on amino acid supplements, it would technically be like adding protein without calories?