Probably the best that anyone can do, is to buy both a prebiotic and a probiotic, and take them at the same time.
But supplements containing FOS (fructo-oligo-saccharides), and Acidophilus would be my choice.
A broad based multi enzyme containing amylase, protease, cellulase, lactase, lipase, invertase, glucoamylase, bromelain, and papain, would be what I would look for.
Remember the "ase" at the end of the word, in biochemistry, it generally denotes some type of enzyme.
Most problems in lifting can be solved by either pulling harder, or pushing harder.