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Peptides and fractionalized Protein are essentially the same animal. The advantage of each is the lower molecular weight; allowing the rapid absorption and hence assimilation of the protein into the muscle tissue. The main thing to consider is that this benefit is of primary importance for post-workout consumption - when you are driving up insulin and want to "pump" protein to the muscle cell quickly with glycogen uptake. During other times it's not a primary concern; and for late-night/overnight you want the opposite, a bigger slow release protein ala casein.
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