Amino acid supplements?
 

I am looking for protein products that are the easiest to absorb, ie, they are already in the simplest biological form, short peptides, or even simpler, amino acid.

If there's no such thing, is there any close alternative? I found out that there is hydrolyzed protein. Is that what I am looking for?

BCAA

whey protein isolate, BCAA's are not the same, they should be used to keep your body anabolic during your workouts or between meals/snacks

avoid at all costs. that's just cow hooves. your body can't absorb it. it's just there to boost the protein content of the supplement.