The two fast-acting proteins which feel the need for speed are, Whey Protein Isolate and Hydrolysed Whey Protein. Your normal Whey Protein will typically be digested within 2 to 2 ˝ hours, whilst Hydrolysed Whey Protein (whey that has been pre-digested) will be digested within 1 to 1 ˝ hours - fast-acting proteins are ideal for a post-workout hit.
The ingestion of Isolated Protein sources (Whey Protein Isolate), generally results in a rapid peak leucinemia (within 30 min) in healthy adults. However, protein-dense whole food ingestion results in slower protein digestion and amino acid absorption rates with a peak dietary amino acid rise at 60–120 min of the post-prandial period.