The answer is that Whey Protein and simple carbs raise insulin levels higher.
Something to do with whey isolate apparantly. i read the article in last month's muscular development - top mag for nutrition, drugs gossip etc.
Therefore I always take some hydrolysed amino capsules with my PWO carbs and protein for extra potency.
I use CNP Pro Aminos for this but there are other brands available although I couldn't venture a guess as to which ones sorry. The aminos must be hydrolysed or isolate for the higher spike to work according to the article, most amino acid capsules are concentrate so check your labels before buying for this purpose.
Reps to Ironman and Dymatiz for the correct answers
