Dietary supplement. Anabolic/Anti-Catabolic Bio-Efficient Protein. Sustained Release Micro-Feed Technology. Fast, medium & slow release profile ideal anytime: Pre-workout, post-workout and before bedtime; Highest levels of the critical 5 amino acids (glutamine, arginine & BCAA's); Flax, CLA & MCT's. Naturally and artificially flavored. 12 Hour sustained release bio-efficient protein. Probolic-SR's patented 12 hour Sustained Release Micro-Feed Technology and superior Critical Five Amino Acid Score (CFAAS) are major breakthroughs in protein supplementation. These two exclusive breakthroughs have set new standards in the bio-efficiency and anabolic effects of protein by giving you something no other protein can: a continual 12 hour supply of the most critical amino acids to stimulate muscle growth, improve recovery-and prevent catabolic muscle wasting. Amino acids are the building blocks for muscle tissue. In order to achieve maximum muscle growth, you must have an adequate supply of amino acids to feed your muscles. Certain amino acids are more important than others for stimulating and supporting muscle growth. These amino acids are called the Critical Five Amino Acids, which include glutamine, arginine and BCAA's (leucine, isoleucine and valine). Probolic-SR's engineered protein matrix of whey concentrate, soy isolate and casein is precisely formulated to supply the absolute highest levels of these Critical Five Amino Acids. Aside from providing the highest Critical Five Amino Acid Score, this protein matrix also provides a fast, medium and slow release profile, which improves bio-availability and nitrogen retention. The exclusive patented Sustained Release Micro-Feed Technology further enhances the release profile and provides a continual supply of Critical Five Amino Acids for up to 12 hours! This controlled sustained release of amino acids to your muscles increases bio-availability and nitrogen retention and creates the ideal anabolic/anti-catabolic state for maximum muscle growth and prevents muscle breakdown. Probolic-SR's Micro-Feed technology makes it the most bio-efficient protein available. Feed your muscles with Probolic-SR-the 12 hour muscle feeder! When other proteins stop working, Probolic-SR keeps feeding muscle tissue for 12 straight hours! Probolic-SR's release profile: Fast release proteins provided by whey-ideal for post workout; Medium and slow release proteins to feed muscle tissue between meals; Patented Micro-Feed Sustained Release Technology to provide a steady supply of amino acids for 12 hours. Probolic-This advanced protein blend (Supro soy protein isolate, whey concentrate casein) contains very high levels of the critical amino acids glutamine, arginine, and BCAA's. Probolic-SR's 12 hour release of amino acids ensures that your muscles receive the nutrition they need to support muscle growth and recovery. This sustained delivery keeps your body in an anabolic muscle building state and prevents catabolic muscle wasting.