The Promolex formula includes a mix of all 3 branched-chain amino acids, which are L-Leucine, L-IsoLeucine, and L-Valine. These are all essential to protein synthesis and skeletal muscle growth, and can support the better utilization of your protein macros. Promolex could be particularly useful for anyone looking for supplements to support their cutting or shredding phase. You do not have to inject it intramuscularly! Promolex comes in convenient tablet form.